Only one screen resolution available on KDE

Hello everybody,

i recently switched to a monitor with a 3440x1440 screen resolution. Unfortunately i sometimes need lower screen resolutions like 2560x1080 or 1920x1080, but i can’t choose them from my KDE system settings.

I’ve already seen that others reported similar issues, but these topics either didn’t meet my problem, or were unanswered.

I already saw, that it should be possible to manually add resolutions via xorg.conf, but i can’t find the configuration file.

I also tried following this xrandr custom resolution - TurluCode

RES="1920 1080 60" && \
DISP=$(xrandr | grep -e " connected [^(]" | sed -e "s/\([A-Z0-9]\+\) connected.*/\1/") && \
MODELINE=$(cvt $(echo $RES) | grep -e "Modeline [^(]" | sed -r 's/.*Modeline (.*)/\1/') && \
MODERES=$(echo $MODELINE | grep -o -P '(?<=").*(?=")') && \
cat > ~/.xprofile << _EOF
#!/bin/sh
xrandr --newmode $MODELINE
xrandr --addmode $DISP $MODERES
_EOF

Well, i get to choose a new resolution, but the screen get’s black. To everyone who wants to try that solution too, install wayland first, so you have an alternative to delete the .xprofile if it doesn’t work.

Uhm so yeah, does someone have an idea what i did wrong, or maybe another solution? I will also append the output of

inxi --admin --verbosity=7 --filter --no-host --width
System:
  Kernel: 5.12.2-1-MANJARO x86_64 bits: 64 compiler: gcc v: 10.2.0 
  parameters: BOOT_IMAGE=/boot/vmlinuz-5.12-x86_64 
  root=UUID=d0dcf297-8999-484d-b070-738c7c120b94 ro quiet apparmor=1 
  security=apparmor udev.log_priority=3 radeon.si_support=0 
  amdgpu.si_support=1 
  Desktop: KDE Plasma 5.21.5 tk: Qt 5.15.2 info: latte-dock wm: kwin_x11 vt: 1 
  dm: SDDM Distro: Manjaro Linux base: Arch Linux 
Machine:
  Type: Desktop Mobo: ASRock model: B450 Gaming K4 serial: <filter> 
  UEFI: American Megatrends v: P4.20 date: 06/19/2020 
Battery:
  Device-1: hidpp_battery_0 model: Logitech Wireless Keyboard K270 
  serial: <filter> charge: 100% (should be ignored) rechargeable: yes 
  status: Discharging 
  Device-2: hidpp_battery_1 
  model: Logitech Marathon Mouse/Performance Plus M705 serial: <filter> 
  charge: 55% (should be ignored) rechargeable: yes status: Discharging 
Memory:
  RAM: total: 15.56 GiB used: 3.83 GiB (24.6%) 
  RAM Report: permissions: Unable to run dmidecode. Root privileges required. 
CPU:
  Info: 6-Core model: AMD Ryzen 5 3600 bits: 64 type: MT MCP arch: Zen 2 
  family: 17 (23) model-id: 71 (113) stepping: 0 microcode: 8701021 cache: 
  L2: 3 MiB bogomips: 86269 
  Speed: 3895 MHz min/max: 2200/3600 MHz boost: enabled Core speeds (MHz): 
  1: 3895 2: 2075 3: 2258 4: 2202 5: 2091 6: 2114 7: 2207 8: 2172 9: 3812 
  10: 2095 11: 2123 12: 2183 
  Flags: 3dnowprefetch abm adx aes aperfmperf apic arat avic avx avx2 bmi1 
  bmi2 bpext cat_l3 cdp_l3 clflush clflushopt clwb clzero cmov cmp_legacy 
  constant_tsc cpb cpuid cqm cqm_llc cqm_mbm_local cqm_mbm_total cqm_occup_llc 
  cr8_legacy cx16 cx8 de decodeassists extapic extd_apicid f16c flushbyasid 
  fma fpu fsgsbase fxsr fxsr_opt ht hw_pstate ibpb ibs irperf lahf_lm lbrv lm 
  mba mca mce misalignsse mmx mmxext monitor movbe msr mtrr mwaitx nonstop_tsc 
  nopl npt nrip_save nx osvw overflow_recov pae pat pausefilter pclmulqdq 
  pdpe1gb perfctr_core perfctr_llc perfctr_nb pfthreshold pge pni popcnt pse 
  pse36 rdpid rdpru rdrand rdseed rdt_a rdtscp rep_good sep sev sev_es sha_ni 
  skinit smap smca sme smep ssbd sse sse2 sse4_1 sse4_2 sse4a ssse3 stibp 
  succor svm svm_lock syscall tce topoext tsc tsc_scale umip v_vmsave_vmload 
  vgif vmcb_clean vme vmmcall wbnoinvd wdt xgetbv1 xsave xsavec xsaveerptr 
  xsaveopt xsaves 
  Vulnerabilities: Type: itlb_multihit status: Not affected 
  Type: l1tf status: Not affected 
  Type: mds status: Not affected 
  Type: meltdown status: Not affected 
  Type: spec_store_bypass 
  mitigation: Speculative Store Bypass disabled via prctl and seccomp 
  Type: spectre_v1 
  mitigation: usercopy/swapgs barriers and __user pointer sanitization 
  Type: spectre_v2 mitigation: Full AMD retpoline, IBPB: conditional, STIBP: 
  conditional, RSB filling 
  Type: srbds status: Not affected 
  Type: tsx_async_abort status: Not affected 
Graphics:
  Device-1: AMD Tahiti XT [Radeon HD 7970/8970 OEM / R9 280X] 
  vendor: PC Partner Limited driver: amdgpu v: kernel alternate: radeon 
  bus-ID: 0a:00.0 chip-ID: 1002:6798 class-ID: 0300 
  Device-2: Microdia USB Live camera type: USB driver: snd-usb-audio,uvcvideo 
  bus-ID: 3-2:3 chip-ID: 0c45:6536 class-ID: 0102 serial: <filter> 
  Display: x11 server: X.Org 1.20.11 compositor: kwin_x11 driver: 
  loaded: amdgpu,ati unloaded: modesetting alternate: fbdev,vesa 
  display-ID: :0 screens: 1 
  Screen-1: 0 s-res: 3440x1440 s-dpi: 96 s-size: 910x381mm (35.8x15.0") 
  s-diag: 987mm (38.8") 
  Monitor-1: DisplayPort-0 res: 3440x1440 dpi: 109 
  size: 798x335mm (31.4x13.2") diag: 865mm (34.1") 
  OpenGL: renderer: AMD Radeon HD 7900 Series (TAHITI DRM 3.40.0 
  5.12.2-1-MANJARO LLVM 11.1.0) 
  v: 4.6 Mesa 21.0.3 direct render: Yes 
Audio:
  Device-1: AMD Tahiti HDMI Audio [Radeon HD 7870 XT / 7950/7970] 
  vendor: PC Partner Limited driver: snd_hda_intel v: kernel bus-ID: 0a:00.1 
  chip-ID: 1002:aaa0 class-ID: 0403 
  Device-2: AMD Starship/Matisse HD Audio vendor: ASRock driver: snd_hda_intel 
  v: kernel bus-ID: 0c:00.4 chip-ID: 1022:1487 class-ID: 0403 
  Device-3: Microdia USB Live camera type: USB driver: snd-usb-audio,uvcvideo 
  bus-ID: 3-2:3 chip-ID: 0c45:6536 class-ID: 0102 serial: <filter> 
  Sound Server-1: ALSA v: k5.12.2-1-MANJARO running: yes 
  Sound Server-2: JACK v: 1.9.18 running: no 
  Sound Server-3: PulseAudio v: 14.2 running: yes 
  Sound Server-4: PipeWire v: 0.3.28 running: no 
Network:
  Device-1: Realtek RTL8192EE PCIe Wireless Network Adapter driver: rtl8192ee 
  v: kernel port: e000 bus-ID: 06:00.0 chip-ID: 10ec:818b class-ID: 0280 
  IF: wlp6s0 state: up mac: <filter> 
  IP v4: <filter> type: dynamic noprefixroute scope: global 
  broadcast: <filter> 
  IP v6: <filter> type: dynamic noprefixroute scope: global 
  IP v6: <filter> type: noprefixroute scope: link 
  Device-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet 
  vendor: ASRock driver: r8169 v: kernel port: c000 bus-ID: 09:00.0 
  chip-ID: 10ec:8168 class-ID: 0200 
  IF: enp9s0 state: down mac: <filter> 
  Device-3: Microsoft Xbox 360 Wireless Adapter type: USB driver: xpad 
  bus-ID: 1-10:6 chip-ID: 045e:0719 class-ID: ff00 serial: <filter> 
  WAN IP: <filter> 
Bluetooth:
  Message: No bluetooth data found. 
Logical:
  Message: No logical block device data found. 
RAID:
  Message: No RAID data found. 
Drives:
  Local Storage: total: 6.06 TiB used: 2.35 TiB (38.8%) 
  SMART Message: Unable to run smartctl. Root privileges required. 
  ID-1: /dev/nvme0n1 maj-min: 259:0 vendor: Western Digital 
  model: WDS200T2B0C-00PXH0 size: 1.82 TiB block-size: physical: 512 B 
  logical: 512 B speed: 31.6 Gb/s lanes: 4 rotation: SSD serial: <filter> 
  rev: 21705000 scheme: GPT 
  ID-2: /dev/sda maj-min: 8:0 vendor: A-Data model: SP610 size: 476.94 GiB 
  block-size: physical: 512 B logical: 512 B speed: 6.0 Gb/s rotation: SSD 
  serial: <filter> rev: 2C scheme: GPT 
  ID-3: /dev/sdb maj-min: 8:16 vendor: Samsung model: SSD 850 EVO 120GB 
  size: 111.79 GiB block-size: physical: 512 B logical: 512 B speed: 6.0 Gb/s 
  rotation: SSD serial: <filter> rev: 1B6Q scheme: GPT 
  ID-4: /dev/sdc maj-min: 8:32 vendor: Seagate model: ST1000LM024 HN-M101MBB 
  size: 931.51 GiB block-size: physical: 4096 B logical: 512 B speed: 3.0 Gb/s 
  rotation: 5400 rpm serial: <filter> rev: 0001 scheme: MBR 
  ID-5: /dev/sdd maj-min: 8:48 vendor: Western Digital model: WD20EZRZ-00Z5HB0 
  size: 1.82 TiB block-size: physical: 4096 B logical: 512 B speed: 6.0 Gb/s 
  rotation: 5400 rpm serial: <filter> rev: 0A80 scheme: GPT 
  ID-6: /dev/sde maj-min: 8:64 type: USB vendor: Verbatim model: STORE N GO 
  size: 29.52 GiB block-size: physical: 512 B logical: 512 B serial: <filter> 
  rev: 0.00 scheme: MBR 
  SMART Message: Unknown USB bridge. Flash drive/Unsupported enclosure? 
  ID-7: /dev/sdf maj-min: 8:80 type: USB vendor: Seagate 
  model: ST1000LM010-9YH146 size: 931.51 GiB block-size: physical: 512 B 
  logical: 512 B rotation: 5400 rpm serial: <filter> rev: 0130 scheme: MBR 
  Optical-1: /dev/sr0 vendor: TSSTcorp model: DVD+-RW TS-H653G rev: DW10 
  dev-links: cdrom 
  Features: speed: 48 multisession: yes audio: yes dvd: yes 
  rw: cd-r,cd-rw,dvd-r,dvd-ram state: running 
Partition:
  ID-1: / raw-size: 1.34 TiB size: 1.31 TiB (98.36%) used: 235.77 GiB (17.5%) 
  fs: ext4 dev: /dev/nvme0n1p2 maj-min: 259:2 label: N/A 
  uuid: d0dcf297-8999-484d-b070-738c7c120b94 
  ID-2: /boot/efi raw-size: 100 MiB size: 96 MiB (96.00%) 
  used: 25.8 MiB (26.8%) fs: vfat dev: /dev/sdb2 maj-min: 8:18 label: N/A 
  uuid: A6F3-B5A5 
  ID-3: /mnt/216471125F774515 raw-size: 495.83 GiB size: 495.83 GiB (100.00%) 
  used: 222.99 GiB (45.0%) fs: ntfs dev: /dev/nvme0n1p1 maj-min: 259:1 
  label: N/A uuid: 216471125F774515 
  ID-4: /mnt/2E6C9FBC6C9F7D71 raw-size: 909.33 GiB size: 909.33 GiB (100.00%) 
  used: 132.33 GiB (14.6%) fs: ntfs dev: /dev/sdc5 maj-min: 8:37 
  label: Dat neuer Speicher uuid: 2E6C9FBC6C9F7D71 
  ID-5: /mnt/C4EF0007EEFFF012 raw-size: 110.71 GiB size: 110.71 GiB (100.00%) 
  used: 86.54 GiB (78.2%) fs: ntfs dev: /dev/sdb4 maj-min: 8:20 
  label: Dat Gehirn uuid: C4EF0007EEFFF012 
  ID-6: /mnt/EE7ED4C57ED4882B raw-size: 1.82 TiB size: 1.82 TiB (100.00%) 
  used: 1.4 TiB (76.8%) fs: ntfs dev: /dev/sdd2 maj-min: 8:50 label: Oschi 
  uuid: EE7ED4C57ED4882B 
  ID-7: /run/media/green/94656d4c-457d-44d3-b0dd-788d330c421a 
  raw-size: 379.19 GiB size: 372.17 GiB (98.15%) used: 95.37 GiB (25.6%) 
  fs: ext4 dev: /dev/sdf3 maj-min: 8:83 label: N/A 
  uuid: 94656d4c-457d-44d3-b0dd-788d330c421a 
  ID-8: /run/media/green/Schwarze Seagteplatte raw-size: 505.8 GiB 
  size: 505.8 GiB (100.00%) used: 203.03 GiB (40.1%) fs: ntfs dev: /dev/sdf1 
  maj-min: 8:81 label: Schwarze Seagteplatte uuid: 06B64B5FB64B4E7D 
  ID-9: /run/media/green/f4718ab4-6763-4b26-aab7-ee7d93c8c71e 
  raw-size: 476.93 GiB size: 468.38 GiB (98.21%) used: 12 KiB (0.0%) fs: ext4 
  dev: /dev/sda1 maj-min: 8:1 label: N/A 
  uuid: f4718ab4-6763-4b26-aab7-ee7d93c8c71e 
Swap:
  Kernel: swappiness: 60 (default) cache-pressure: 100 (default) 
  ID-1: swap-1 type: file size: 8 GiB used: 0 KiB (0.0%) priority: -2 
  file: /swapfile 
Unmounted:
  ID-1: /dev/sdb1 maj-min: 8:17 size: 300 MiB fs: ntfs 
  label: Wiederherstellung uuid: 942EF2FC2EF2D5E8 
  ID-2: /dev/sdb3 maj-min: 8:19 size: 128 MiB fs: <superuser required> 
  label: N/A uuid: N/A 
  ID-3: /dev/sdb5 maj-min: 8:21 size: 577 MiB fs: ntfs label: N/A 
  uuid: 8820696E206963E2 
  ID-4: /dev/sdc1 maj-min: 8:33 size: 1 KiB fs: <superuser required> 
  label: N/A uuid: N/A 
  ID-5: /dev/sdc2 maj-min: 8:34 size: 21.98 GiB fs: ntfs label: SAMSUNG_REC 
  uuid: C2AEEB2DAEEB18A5 
  ID-6: /dev/sdd1 maj-min: 8:49 size: 16 MiB fs: <superuser required> 
  label: N/A uuid: N/A 
  ID-7: /dev/sde1 maj-min: 8:65 size: 3 GiB fs: iso9660 
  label: MANJARO_KDE_2021 uuid: 2021-01-03-09-07-36-00 
  ID-8: /dev/sde2 maj-min: 8:66 size: 4 MiB fs: vfat label: MISO_EFI 
  uuid: 7B2D-7571 
  ID-9: /dev/sdf2 maj-min: 8:82 size: 46.12 GiB fs: ntfs label: LENOVO_PART 
  uuid: 5C18EE2118EDF9C2 
USB:
  Hub-1: 1-0:1 info: Full speed (or root) Hub ports: 10 rev: 2.0 
  speed: 480 Mb/s chip-ID: 1d6b:0002 class-ID: 0900 
  Hub-2: 1-1:2 info: VIA Labs Hub ports: 4 rev: 2.1 speed: 480 Mb/s 
  chip-ID: 2109:2811 class-ID: 0900 
  Device-1: 1-1.1:4 info: Logitech Unifying Receiver type: Keyboard,Mouse,HID 
  driver: logitech-djreceiver,usbhid interfaces: 3 rev: 2.0 speed: 12 Mb/s 
  power: 98mA chip-ID: 046d:c52b class-ID: 0300 
  Device-2: 1-4:3 info: Seagate RSS LLC Expansion Portable type: Mass Storage 
  driver: usb-storage interfaces: 1 rev: 2.0 speed: 480 Mb/s power: 100mA 
  chip-ID: 0bc2:2300 class-ID: 0806 serial: <filter> 
  Device-3: 1-7:5 info: Verbatim STORE N GO type: Mass Storage 
  driver: usb-storage interfaces: 1 rev: 2.1 speed: 480 Mb/s power: 480mA 
  chip-ID: 18a5:0249 class-ID: 0806 serial: <filter> 
  Device-4: 1-10:6 info: Microsoft Xbox 360 Wireless Adapter type: WiFi 
  driver: xpad interfaces: 8 rev: 2.0 speed: 12 Mb/s power: 260mA 
  chip-ID: 045e:0719 class-ID: ff00 serial: <filter> 
  Hub-3: 2-0:1 info: Full speed (or root) Hub ports: 4 rev: 3.1 speed: 10 Gb/s 
  chip-ID: 1d6b:0003 class-ID: 0900 
  Hub-4: 2-1:2 info: VIA Labs Hub ports: 4 rev: 3.0 speed: 5 Gb/s 
  chip-ID: 2109:8110 class-ID: 0900 
  Hub-5: 3-0:1 info: Full speed (or root) Hub ports: 4 rev: 2.0 
  speed: 480 Mb/s chip-ID: 1d6b:0002 class-ID: 0900 
  Device-1: 3-1:2 info: HP Deskjet D1600 series type: Printer driver: usblp 
  interfaces: 2 rev: 2.0 speed: 480 Mb/s power: 2mA chip-ID: 03f0:7f11 
  class-ID: 0701 serial: <filter> 
  Device-2: 3-2:3 info: Microdia USB Live camera type: Video,Audio 
  driver: snd-usb-audio,uvcvideo interfaces: 5 rev: 2.0 speed: 480 Mb/s 
  power: 500mA chip-ID: 0c45:6536 class-ID: 0102 serial: <filter> 
  Device-3: 3-4:4 info: Line6 UX1 type: <vendor specific> 
  driver: snd_usb_toneport interfaces: 1 rev: 1.0 speed: 12 Mb/s power: 498mA 
  chip-ID: 0e41:4150 class-ID: ff00 
  Hub-6: 4-0:1 info: Full speed (or root) Hub ports: 4 rev: 3.1 speed: 10 Gb/s 
  chip-ID: 1d6b:0003 class-ID: 0900 
Sensors:
  System Temperatures: cpu: 56.9 C mobo: 0 C gpu: amdgpu temp: 45.0 C 
  Fan Speeds (RPM): N/A 
Info:
  Processes: 302 Uptime: 7m wakeups: 7 Init: systemd v: 247 tool: systemctl 
  Compilers: gcc: 10.2.0 clang: 11.1.0 Packages: pacman: 1597 lib: 455 
  flatpak: 0 Shell: Bash v: 5.1.8 running-in: konsole inxi: 3.3.04 

Thank you all very much in advance :slight_smile:

For you to follow the tip before you have to check what options your monitor system offers you, with:

xrandr

Use the google translator and read here:

Good luck!

T+ = See you later

Thank you for your answer :smiley:

For some obscure reason, Google Translate doesn’t work for me on that side :confused:

But i don’t think, xrandr is right in this case. Under Windows i can use any screen resolution i want, and get out of the box the other screen resolutions, so from there i know it is not a hardware sided problem. I know, win vs linux discussions are getting old, but in this case, i can’t see, why linux shouldn’t be able to support this.

The output of “xrandr” is

Screen 0: minimum 320 x 200, current 3440 x 1440, maximum 16384 x 16384
DisplayPort-0 connected primary 3440x1440+0+0 (normal left inverted right x axis y axis) 798mm x 335mm
   3440x1440     59.97 +  99.98*   94.99    89.96    84.96    79.98    49.99  
HDMI-A-0 disconnected (normal left inverted right x axis y axis)
DVI-D-0 disconnected (normal left inverted right x axis y axis)
DVI-I-1 disconnected (normal left inverted right x axis y axis)

So yeah, i see that out of the box xrandr wants to support only this one resolution, but it seems to be a more or less common problem, that due to faulty drivers only one resolutio is detected. I also tried the arch wiki for xrandr#adding_undetected_resolutions, but as the commands there are basically the same as above, it resulted in the same black screen.

Hi,

As my native language is not English I may be missing something.

I’ll try to explain slowly

Forcing a resolution should be as close to one as you have in the options that the xrandr command does not offer

I’ll give an example of mine here:

xrandr                                                           ✔ 
Screen 0: minimum 320 x 200, current 1280 x 720, maximum 8192 x 8192
LVDS connected primary 1280x720+0+0 (normal left inverted right x axis y axis) 309mm x 174mm
   1366x768      60.07 +  40.04  
   1280x720      59.97* 
   1152x768      59.95  
   1024x768      59.95  
   800x600       59.96  
   848x480       59.94  
   720x480       59.94  
   640x480       59.94  
HDMI-0 connected 1280x720+0+0 (normal left inverted right x axis y axis) 697mm x 392mm
   1280x720      60.00*+  59.94  
   1920x1080     60.00    59.94  
   1920x1080i    60.00    59.94  
   1440x480i     59.94  
   720x480       60.00    59.94  
   720x480i      60.00    59.94  
   640x480       60.00    59.94  
VGA-0 disconnected (normal left inverted right x axis y axis)

My monitor is at this resolution LVDS:
1366x768 60.07 + 40.04

If I want to use a lower resolution and it will work, it has to be the closest to these options:

1280x720      59.97* 
1152x768      59.95

But I want it to be: 1280x800, so I have to do the following

cvt 1280 800 60

and copy everything after Modeline

Modeline "1280x800_60.00" 83.50 1280 1352 1480 1680 800 803 809 831 -hsync +vsync

Or better

"1280x800_60.00" 83.50 1280 1352 1480 1680 800 803 809 831 -hsync +vsync

From here continue to execute the hint commands.

To conclude I could not try for example the resolution 1440x480, because it wouldn’t work, it would probably give the same black screen

I hope I made you understand me and I apologize for my bad English

T+ = See you later

Hello again,

so after your suggestion i tried a few more different resolutions, to see if it works then.

I tried 2560x1080, which would be 21:9 just like my native aspect ratio, no luck there, and after that i tried 2560x1440 which fits my native resolution 3440x1440, unfortunately both attempts fail again with a black screen.

The output of the cvt command of both resolutions is for me

# 2560x1080 59.98 Hz (CVT) hsync: 67.17 kHz; pclk: 230.00 MHz
Modeline "2560x1080_60.00"  230.00  2560 2720 2992 3424  1080 1083 1093 1120 -hsync +vsync
# 2560x1440 59.96 Hz (CVT 3.69M9) hsync: 89.52 kHz; pclk: 312.25 MHz
Modeline "2560x1440_60.00"  312.25  2560 2752 3024 3488  1440 1443 1448 1493 -hsync +vsync

Do i maybe have a problem there? I don’t really know what all the numbers exactly mean there, so i can’t really sanity check them :confused:

Did you continue with the other commands of the tip my dear?

xrandr --newmode "2560x1440_60.00" 312.25 2560 2752 3024 3488 1440 1443 1448 1493 -hsync +vsync

Depending on your equipment, LVDS; VGA; hdmi

xrandr --addmode LVDS-0 2560x1440_60.00
LVDS-0 << It is an example

Later
xrandr --output LVDS-0 --mode 2560x1440_60.00

It seems that you are having difficulty reading the tip to the end, but these are the procedures.

Good luck!

T+ = See you later

Yes, i continued with the other tips :slight_smile:

to be exact, the commands i typed were

cvt 2560 1440 60
# 2560x1440 59.96 Hz (CVT 3.69M9) hsync: 89.52 kHz; pclk: 312.25 MHz
Modeline "2560x1440_60.00"  312.25  2560 2752 3024 3488  1440 1443 1448 1493 -hsync +vsync
xrandr --newmode "2560x1440_60.00"  312.25  2560 2752 3024 3488  1440 1443 1448 1493 -hsync +vsync
xrandr --addmode DisplayPort-0 2560x1440_60.00
xrandr --output DisplayPort-0 --mode 2560x1440_60.00

and after that it turns black and stays there till i restart. I’m very confident that DisplayPort-0 is right, as you can see in my first post in the inxi section.

Do i have something wrong there? What am i missing?

Yes, I looked at your inxi command, but

For us to have more information you can paste the output of the command xrandr here, everything from top to bottom, that is, the complete output, as i showed mine in the message:

See if you have the autorandr package installed on your system

T+ = See you later

Sure, everything that is needed to help :smiley:

Screen 0: minimum 320 x 200, current 3440 x 1440, maximum 16384 x 16384
DisplayPort-0 connected primary 3440x1440+0+0 (normal left inverted right x axis y axis) 798mm x 335mm
   3440x1440     59.97 +  99.98*   94.99    89.96    84.96    79.98    49.99  
HDMI-A-0 disconnected (normal left inverted right x axis y axis)
DVI-D-0 disconnected (normal left inverted right x axis y axis)
DVI-I-1 disconnected (normal left inverted right x axis y axis)

I had the autorandr package not installed. I have installed it now, did a restart, but i can’t see that anything changed. From how i understand the package, it also aims to do something different than what is the problem here.

Okay, so i tested the monitor again, on an Ubuntu 20.04, also via Displayport, on a physically other device.

This is the output of xrandr on that other device. It was a Laptop, therefore it has it buit in primary display. The monitor seems to be plugged in via DP-2

xrandr
Screen 0: minimum 320 x 200, current 3840 x 1440, maximum 16384 x 16384
LVDS-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 345mm x 194mm
   1920x1080     59.98*+  59.97    59.96    59.93    39.99  
   1680x1050     60.00    59.95    59.88  
   1600x1024     60.17  
   1400x1050     59.98    60.00  
   1600x900      59.99    59.94    59.95    59.82  
   1280x1024     59.95    60.02  
   1440x900      59.89  
   1400x900      59.96    59.88  
   1280x960      60.00    59.99  
   1440x810      60.00    59.97  
   1368x768      59.88    59.85  
   1360x768      59.80    59.96  
   1280x800      59.99    59.97    59.81    59.91  
   1152x864      59.97    60.00  
   1280x720      60.00    59.99    59.86    59.74  
   1024x768      60.04    60.00    59.95  
   960x720       60.00  
   928x696       60.05  
   896x672       60.01  
   1024x576      59.95    59.96    59.90    59.82  
   960x600       59.93    60.00  
   960x540       59.96    59.99    59.63    59.82  
   800x600       60.00    60.32    59.96    56.25  
   840x525       60.01    59.88  
   864x486       59.92    59.57  
   800x512       60.17  
   700x525       59.98  
   800x450       59.95    59.82  
   640x512       60.02  
   720x450       59.89  
   700x450       59.96    59.88  
   640x480       60.00    59.94    59.94  
   720x405       59.51    58.99  
   720x400       59.97  
   684x384       59.88    59.85  
   680x384       59.80    59.96  
   640x400       59.88    59.98    59.96  
   576x432       60.06  
   640x360       59.86    59.83    59.84    59.32  
   640x350       59.84  
   512x384       60.00  
   512x288       60.00    59.92  
   480x270       59.63    59.82  
   400x300       60.32    56.34  
   432x243       59.92    59.57  
   320x240       60.05  
   360x202       59.51    59.13  
   320x180       59.84    59.32  
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 connected 1920x1440+1920+0 (normal left inverted right x axis y axis) 798mm x 335mm
   3440x1440     59.97 +  99.98    94.99    89.96    84.96    79.98    49.99  
   2560x1440     59.99    59.96    59.95  
   1920x1440     85.00    75.00    60.00* 
   1856x1392     75.00    60.01  
   1792x1344     75.00    60.01  
   2048x1152     59.99    59.98    59.90    59.91  
   1920x1200     59.88    59.95  
   1920x1080     60.01    59.97    59.96    59.93  
   1600x1200     85.00    75.00    70.00    65.00    60.00  
   1680x1050     84.94    74.89    69.88    59.95    59.88  
   1600x1024     60.17  
   1400x1050     85.00    74.76    70.00    59.98  
   1600x900      59.99    59.94    59.95    59.82  
   1280x1024     85.02    75.02    60.02  
   1440x900      59.89  
   1400x900      59.96    59.88  
   1280x960      85.00    60.00  
   1440x810      60.00    59.97  
   1368x768      59.88    59.85  
   1360x768      59.80    59.96  
   1280x800      59.99    59.97    59.81    59.91  
   1152x864     100.00    85.06    85.00    75.00    75.00    70.00    60.00  
   1280x720      60.00    59.99    59.86    59.74  
   1024x768      85.00    75.05    60.04    85.00    75.03    70.07    60.00  
   1024x768i     86.96  
   960x720       85.00    75.00    60.00  
   928x696       75.00    60.05  
   896x672       75.05    60.01  
   1024x576      59.95    59.96    59.90    59.82  
   960x600       59.93    60.00  
   832x624       74.55  
   960x540       59.96    59.99    59.63    59.82  
   800x600       85.00    75.00    70.00    65.00    60.00    85.14    72.19    75.00    60.32    56.25  
   840x525       85.02    74.96    69.88    60.01    59.88  
   864x486       59.92    59.57  
   800x512       60.17  
   700x525       85.08    74.76    70.06    59.98  
   800x450       59.95    59.82  
   640x512       85.02    75.02    60.02  
   720x450       59.89  
   700x450       59.96    59.88  
   640x480       85.09    60.00    85.01    72.81    75.00    59.94  
   720x405       59.51    58.99  
   720x400       85.04  
   684x384       59.88    59.85  
   680x384       59.80    59.96  
   640x400       59.88    59.98    85.08  
   576x432      100.11    85.15    85.09    75.00    75.00    70.00    60.06  
   640x360       59.86    59.83    59.84    59.32  
   640x350       85.08  
   512x384       85.00    75.03    70.07    60.00  
   512x384i      87.06  
   512x288       60.00    59.92  
   416x312       74.66  
   480x270       59.63    59.82  
   400x300       85.27    72.19    75.12    60.32    56.34  
   432x243       59.92    59.57  
   320x240       85.18    72.81    75.00    60.05  
   360x202       59.51    59.13  
   360x200       85.04  
   320x200       85.27  
   320x180       59.84    59.32  
   320x175       85.27  
eDP-1 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)
VGA-1 disconnected (normal left inverted right x axis y axis)

Looks promising, right? Lots of options to choose. And yes, i can choose from the GUI even, but unfortunately the screen stays also black. Could it have something to do with how linux speaks to the monitor, is that in anyway different from other OS?

Edit #1
In further research of the problem. i also booted now with an manjaro gnome usb stick on my original machine, to see what would happen.

xrandr
Screen 0: minimum 16 x 16, current 3440 x 1440, maximum 32767 x 32767
XWAYLAND0 connected primary 3440x1440+0+0 (normal left inverted right x axis y axis) 800mm x 340mm
   3440x1440     59.94*+
   1920x1440     59.90  
   1600x1200     59.87  
   1440x1080     59.87  
   1400x1050     59.86  
   1280x1024     59.89  
   1280x960      59.94  
   1152x864      59.78  
   1024x768      59.92  
   800x600       59.86  
   640x480       59.38  
   320x240       59.52  
   1920x1200     59.88  
   1680x1050     59.95  
   1440x900      59.89  
   1280x800      59.81  
   720x480       59.71  
   640x400       59.20  
   320x200       58.96  
   2560x1440     59.91  
   2048x1152     59.90  
   1920x1080     59.96  
   1600x900      59.95  
   1368x768      59.88  
   1280x720      59.86  
   1024x576      59.90  
   864x486       59.92  
   720x400       59.55  
   640x350       59.77  
  1920x1080_60.00 (0x266) 173.000MHz -HSync +VSync
        h: width  1920 start 2048 end 2248 total 2576 skew    0 clock  67.16KHz
        v: height 1080 start 1083 end 1088 total 1120           clock  59.96Hz

This is the result of xrandr of the USB Stick. It shows the options there, but i can’t choose any different resolution from the known only one. Unfortunately i forgot to safe what the error message was, when i tried to set it to 1920x1080 via CLI, i will append that in a second.

Edit #2
The promised appendix

xrandr --output XWAYLAND0 --mode 1920x1080
X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  140 (RANDR)
  Minor opcode of failed request:  7 (RRSetScreenSize)
  Serial number of failed request:  22
  Current serial number in output stream:  23

I don’t know if this helps, i would really wish though.

What was interesting to me, that Gnome correctly identified the monitor model (Acer Predator X34) and even load some color correction file, or something related for it. This means to me that the OS can more or less correctly identify the screen. That’s something at least.

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As I said before, English is not my native language so I may be misunderstanding something

Is this DisplayPort-0 an external monitor? Is your computer a notebook or desktop with CPU + Monitor?

My PC is a desktop computer, no laptop. So yes, DisplayPort-0 is an external monitor, no built in laptop screen

I just tried the monitor on a laptop, to see, if it could be my graphics card, respective the driver.

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The folks at the Blog (pt_BR) Manjariando have a good knowledge, maybe this post from them will help you better than me

In other words, everything I said before is present in this other article as well.

Good luck!

T+ = See you later

Thank you very much for all your tries to help me :slight_smile:

Maybe it resolves itself some day from alone :smiley: i will continue to look into it.

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I also keep looking for my dear, because as this was always relatively easy to do with xrandr I found it strange that you didn’t succeed there.

Good luck!

T+ = See you later

Update:

I changed my graphics card from a R9 280X to an R9 590, and now i CAN change the resolution. So, there are a few possibilities here now i guess, and i think the most probable would be a driver issue. It is not an hardware issue, as Windows has shown, that it’s possible.

So to everyone else having struggle with this issue, i think the solution isn’t that easy…

Hi,
Have you tried booting with another kernel?
For example, you could try a LTS version (5.10, 5.4 …).

yeah, i have defintily tried different kernel versions, from at least 5.10 to 5.12, but not anything earlier like 5.4.

5.4, 4.19 (and 4.14) are still LTS and recommended kernels.
I know, they are old kernels, but just to understand if it is a kernel problem, I would try them. :man_shrugging:

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