Issues detecting monitor resolution

Hi,

I’m using a 2560x1080 monitor and I’m only able to use this resolution if I let the computer turn on before turning on the monitor. If the monitor is on while the pc boots, it sets the resolution at 1080p and the native resolution is not listed in the settings.

It’s a minor inconvenience to have to be careful about how I boot the computer, but I still would like to fix this.

Is there some way I could try to manually redetect the available resolutions without rebooting? or some other way I could try to fix this?

This used to work fine when I had an actual GPU in this computer. But recently, this gpu died and I’ve been using the integrated graphics from my intel cpu instead.

I’ll add here the two different outputs of xrandr: booting with the monitor on (and getting at most 1920x1080), and then booting with the monitor off (and getting 2560x1080).

This is xrandr after booting with the monitor on:

[bruno@Listuq ~]$ xrandr
Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767
DP1 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 580mm x 240mm
   1920x1080     60.00    50.00    59.94*   30.00    29.97  
   1920x1080i    60.00    50.00    59.94  
   1680x1050     59.88  
   1600x900      60.00  
   1280x1024     75.02    60.02  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       75.00    60.00    59.94  
   720x400       70.08  
VGA1 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

And this is xrandr after booting with the monitor off:

[bruno@Listuq ~]$ xrandr
Screen 0: minimum 8 x 8, current 2560 x 1080, maximum 32767 x 32767
DP1 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 connected primary 2560x1080+0+0 (normal left inverted right x axis y axis) 580mm x 240mm
   2560x1080     60.00*+
   1920x1080     60.00    50.00    59.94    30.00    29.97  
   1920x1080i    60.00    50.00    59.94  
   1680x1050     59.88  
   1600x900      60.00  
   1280x1024     75.02    60.02  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       75.00    60.00    59.94  
   720x400       70.08  
VGA1 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

I’ve tried reconnecting the HDMI cable in with the monitor on/off, but it didn’ t change which resolutions were listed in the settings.

And here’s some information about the system:

[bruno@Listuq ~]$ inxi --admin --verbosity=7 --filter --no-host --width
System:
  Kernel: 5.12.9-1-MANJARO x86_64 bits: 64 compiler: gcc v: 11.1.0 
  parameters: BOOT_IMAGE=/boot/vmlinuz-5.12-x86_64 
  root=UUID=04dc1621-8580-4deb-a48a-d3a224a2ce22 rw radeon.si_support=1 
  amdgpu.si_support=0 quiet udev.log_priority=3 
  Desktop: KDE Plasma 5.21.5 tk: Qt 5.15.2 wm: kwin_x11 vt: 1 dm: SDDM 
  Distro: Manjaro Linux base: Arch Linux 
Machine:
  Type: Desktop System: Gigabyte product: N/A v: N/A serial: <filter> Chassis: 
  type: 3 serial: <filter> 
  Mobo: Gigabyte model: H77-D3H v: x.x serial: <filter> 
  UEFI: American Megatrends v: F11 date: 08/21/2012 
Battery:
  Message: No system battery data found. Is one present? 
Memory:
  RAM: total: 19.44 GiB used: 2.71 GiB (14.0%) 
  RAM Report: permissions: Unable to run dmidecode. Root privileges required. 
CPU:
  Info: Quad Core model: Intel Core i7-3770K bits: 64 type: MT MCP 
  arch: Ivy Bridge family: 6 model-id: 3A (58) stepping: 9 microcode: 21 
  cache: L2: 8 MiB bogomips: 55888 
  Speed: 1597 MHz min/max: 1600/3900 MHz Core speeds (MHz): 1: 1597 2: 1596 
  3: 1597 4: 1597 5: 1597 6: 1597 7: 1597 8: 1597 
  Flags: acpi aes aperfmperf apic arat arch_perfmon avx bts clflush cmov 
  constant_tsc cpuid cpuid_fault cx16 cx8 de ds_cpl dtes64 dtherm dts epb ept 
  erms est f16c flexpriority flush_l1d fpu fsgsbase fxsr ht ibpb ibrs ida 
  lahf_lm lm mca mce md_clear mmx monitor msr mtrr nonstop_tsc nopl nx pae pat 
  pbe pcid pclmulqdq pdcm pebs pge pln pni popcnt pse pse36 pti pts rdrand 
  rdtscp rep_good sep smep ss ssbd sse sse2 sse4_1 sse4_2 ssse3 stibp syscall 
  tm tm2 tpr_shadow tsc tsc_deadline_timer vme vmx vnmi vpid xsave xsaveopt 
  xtopology xtpr 
  Vulnerabilities: Type: itlb_multihit status: KVM: VMX disabled 
  Type: l1tf 
  mitigation: PTE Inversion; VMX: conditional cache flushes, SMT vulnerable 
  Type: mds mitigation: Clear CPU buffers; SMT vulnerable 
  Type: meltdown mitigation: PTI 
  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 generic retpoline, IBPB: conditional, 
  IBRS_FW, STIBP: conditional, RSB filling 
  Type: srbds status: Vulnerable: No microcode 
  Type: tsx_async_abort status: Not affected 
Graphics:
  Device-1: Intel Xeon E3-1200 v2/3rd Gen Core processor Graphics 
  vendor: Gigabyte driver: i915 v: kernel bus-ID: 00:02.0 chip-ID: 8086:0162 
  class-ID: 0300 
  Display: x11 server: X.Org 1.20.11 compositor: kwin_x11 driver: 
  loaded: intel unloaded: modesetting alternate: fbdev,vesa display-ID: :0 
  screens: 1 
  Screen-1: 0 s-res: 2560x1080 s-dpi: 120 s-size: 540x228mm (21.3x9.0") 
  s-diag: 586mm (23.1") 
  Monitor-1: HDMI2 res: 2560x1080 hz: 60 dpi: 112 size: 580x240mm (22.8x9.4") 
  diag: 628mm (24.7") 
  OpenGL: renderer: Mesa DRI Intel HD Graphics 4000 (IVB GT2) 
  v: 4.2 Mesa 21.1.2 compat-v: 3.0 direct render: Yes 
Audio:
  Device-1: Intel 7 Series/C216 Family High Definition Audio vendor: Gigabyte 
  driver: snd_hda_intel v: kernel bus-ID: 00:1b.0 chip-ID: 8086:1e20 
  class-ID: 0403 
  Sound Server-1: ALSA v: k5.12.9-1-MANJARO running: yes 
  Sound Server-2: JACK v: 0.125.0 running: no 
  Sound Server-3: PulseAudio v: 14.2 running: yes 
  Sound Server-4: PipeWire v: 0.3.30 running: yes 
Network:
  Device-1: Qualcomm Atheros AR9485 Wireless Network Adapter driver: ath9k 
  v: kernel port: f040 bus-ID: 02:00.0 chip-ID: 168c:0032 class-ID: 0280 
  IF: wlp2s0 state: down mac: <filter> 
  Device-2: Qualcomm Atheros AR8161 Gigabit Ethernet vendor: Gigabyte 
  driver: alx v: kernel port: e000 bus-ID: 05:00.0 chip-ID: 1969:1091 
  class-ID: 0200 
  IF: enp5s0 state: up speed: 1000 Mbps duplex: full mac: <filter> 
  IP v4: <filter> type: dynamic noprefixroute scope: global 
  broadcast: <filter> 
  IP v6: <filter> type: dynamic noprefixroute scope: global 
  IP v6: <filter> type: dynamic noprefixroute scope: global 
  IP v6: <filter> type: noprefixroute scope: link 
  WAN IP: <filter> 
Bluetooth:
  Message: No bluetooth data found. 
Logical:
  Permissions: Unable to run lvs. Root privileges required. 
RAID:
  Message: No RAID data found. 
Drives:
  Local Storage: total: 987.41 GiB used: 573.39 GiB (58.1%) 
  SMART Message: Unable to run smartctl. Root privileges required. 
  ID-1: /dev/sda maj-min: 8:0 vendor: Kingston model: SV300S37A60G 
  size: 55.9 GiB block-size: physical: 512 B logical: 512 B speed: 6.0 Gb/s 
  rotation: SSD serial: <filter> rev: BBF0 scheme: GPT 
  ID-2: /dev/sdb maj-min: 8:16 vendor: Western Digital model: WD10EZEX-21WN4A0 
  size: 931.51 GiB block-size: physical: 4096 B logical: 512 B speed: 3.0 Gb/s 
  rotation: 7200 rpm serial: <filter> rev: 1A01 scheme: GPT 
  Optical-1: /dev/sr0 vendor: HL-DT-ST model: DVDRAM GH24NS95 rev: RN00 
  dev-links: cdrom 
  Features: speed: 12 multisession: yes audio: yes dvd: yes 
  rw: cd-r,cd-rw,dvd-r,dvd-ram state: running 
Partition:
  ID-1: / raw-size: 55.4 GiB size: 54.28 GiB (97.98%) used: 38.11 GiB (70.2%) 
  fs: ext4 dev: /dev/sda2 maj-min: 8:2 label: N/A 
  uuid: 04dc1621-8580-4deb-a48a-d3a224a2ce22 
  ID-2: /boot/efi raw-size: 512 MiB size: 511 MiB (99.80%) 
  used: 280 KiB (0.1%) fs: vfat dev: /dev/sda1 maj-min: 8:1 label: N/A 
  uuid: 61F1-286F 
  ID-3: /home raw-size: 931.51 GiB size: 915.89 GiB (98.32%) 
  used: 535.29 GiB (58.4%) fs: ext4 dev: /dev/sdb1 maj-min: 8:17 label: Bolota 
  uuid: 50d87f83-f49e-4c86-981a-e905c01f6566 
Swap:
  Alert: No swap data was found. 
Unmounted:
  Message: No unmounted partitions found. 
USB:
  Hub-1: 1-0:1 info: Full speed (or root) Hub ports: 2 rev: 2.0 
  speed: 480 Mb/s chip-ID: 1d6b:0002 class-ID: 0900 
  Hub-2: 1-1:2 info: Intel Integrated Rate Matching Hub ports: 6 rev: 2.0 
  speed: 480 Mb/s chip-ID: 8087:0024 class-ID: 0900 
  Device-1: 1-1.5:3 info: Holtek Mechanical Keyboard type: Keyboard,HID 
  driver: hid-generic,usbhid interfaces: 2 rev: 1.1 speed: 1.5 Mb/s 
  power: 100mA chip-ID: 04d9:1836 class-ID: 0300 
  Device-2: 1-1.6:4 info: [Maxxter] USB GAMING MOUSE type: Mouse,Keyboard 
  driver: hid-generic,usbhid interfaces: 2 rev: 1.1 speed: 1.5 Mb/s 
  power: 100mA chip-ID: 18f8:0fc0 class-ID: 0301 
  Hub-3: 2-0:1 info: Full speed (or root) Hub ports: 2 rev: 2.0 
  speed: 480 Mb/s chip-ID: 1d6b:0002 class-ID: 0900 
  Hub-4: 2-1:2 info: Intel Integrated Rate Matching Hub ports: 8 rev: 2.0 
  speed: 480 Mb/s chip-ID: 8087:0024 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 
  Hub-6: 3-3:2 info: Genesys Logic Hub ports: 4 rev: 2.1 speed: 480 Mb/s 
  power: 100mA chip-ID: 05e3:0610 class-ID: 0900 
  Hub-7: 4-0:1 info: Full speed (or root) Hub ports: 4 rev: 3.0 speed: 5 Gb/s 
  chip-ID: 1d6b:0003 class-ID: 0900 
  Hub-8: 4-3:2 info: Genesys Logic Hub ports: 4 rev: 3.1 speed: 5 Gb/s 
  chip-ID: 05e3:0612 class-ID: 0900 
  Hub-9: 5-0:1 info: Full speed (or root) Hub ports: 2 rev: 2.0 
  speed: 480 Mb/s chip-ID: 1d6b:0002 class-ID: 0900 
  Hub-10: 6-0:1 info: Full speed (or root) Hub ports: 2 rev: 3.0 speed: 5 Gb/s 
  chip-ID: 1d6b:0003 class-ID: 0900 
Sensors:
  System Temperatures: cpu: 29.8 C mobo: 27.8 C 
  Fan Speeds (RPM): N/A 
Info:
  Processes: 235 Uptime: 30m wakeups: 0 Init: systemd v: 248 tool: systemctl 
  Compilers: gcc: 11.1.0 clang: 12.0.0 Packages: pacman: 1749 lib: 456 
  Shell: Bash v: 5.1.8 running-in: yakuake inxi: 3.3.04

Thanks