It is possible to use 2560x1080 resolution on Linux using ATI Radeon?

Hi guys, I’m new to Linux.
I’m really enjoying Manjaro XFCE, life has changed completely.

Question

What should I do to make the 2560x1080 resolution option appear on display settings in Manjaro XFCE Minimal?

In addition to the updates on Pamac after installing Manjaro do I need to do anything else? Do I need to install anything that doesn’t come with Manjaro? If so, how do I do this?

Setup

  • LG Ultrawide 25 monitor (I use only the monitor screen)
  • ASUS N53ta Laptop - ATI Radeon® HD 6720G2 Graphics with 2GB DDR3 VRAM

Approaches I’ve tried and failed

  • Setting a new mode via xrandr
  • I tried to look for a driver on the AMD website but found nothing that appears to be compatible.
  • I tried to change the Kernel version to 4.19 and boot but it didn’t change anything.

Context

I used to plug the monitor into the laptop (hdmi) and in Windows 10 it automatically displayed the desired resolution 2560x1080 (21: 9)

After installing the Manjaro XFCE Minimal when I plug in the monitor, the highest resolution that appears to me is 1920x1080

System information

System:
  Kernel: 4.19.141-2-MANJARO x86_64 bits: 64 compiler: gcc v: 10.2.0 
  parameters: BOOT_IMAGE=/boot/vmlinuz-4.19-x86_64 
  root=UUID=0656753a-2c28-42e2-bcd0-0353336aa290 rw quiet udev.log_priority=3 
  Desktop: Xfce 4.14.2 tk: Gtk 3.24.20 info: xfce4-panel wm: xfwm4 
  dm: LightDM 1.30.0 Distro: Manjaro Linux 
Machine:
  Type: Laptop System: ASUSTeK product: N53Ta v: 1.0 serial: <filter> 
  Mobo: ASUSTeK model: N53Ta v: 1.0 serial: <filter> UEFI: American Megatrends 
  v: N53Ta.209 date: 12/10/2011 
Battery:
  ID-1: BAT0 charge: 26.8 Wh condition: 40.8/48.4 Wh (84%) volts: 11.0/11.1 
  model: ASUSTek M50--24 type: Li-ion serial: N/A status: Discharging 
CPU:
  Topology: Quad Core model: AMD A6-3420M APU with Radeon HD Graphics bits: 64 
  type: MCP arch: Fusion family: 12 (18) model-id: 1 stepping: N/A 
  microcode: 3000027 L2 cache: 4096 KiB 
  flags: lm nx pae sse sse2 sse3 sse4a svm bogomips: 11979 
  Speed: 799 MHz min/max: 800/1500 MHz boost: enabled Core speeds (MHz): 
  1: 802 2: 803 3: 804 4: 804 
  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 status: Not affected 
  Type: spectre_v1 
  mitigation: usercopy/swapgs barriers and __user pointer sanitization 
  Type: spectre_v2 
  mitigation: Full AMD retpoline, STIBP: disabled, RSB filling 
  Type: srbds status: Not affected 
  Type: tsx_async_abort status: Not affected 
Graphics:
  Device-1: AMD Sumo [Radeon HD 6520G] vendor: ASUSTeK driver: radeon 
  v: kernel bus ID: 00:01.0 chip ID: 1002:9647 
  Device-2: AMD Whistler [Radeon HD 6630M/6650M/6750M/7670M/7690M] 
  vendor: ASUSTeK driver: radeon v: kernel bus ID: 01:00.0 chip ID: 1002:6741 
  Device-3: Alcor Micro ASUS USB2.0 WebCam type: USB driver: uvcvideo 
  bus ID: 4-2:2 chip ID: 058f:a004 
  Display: x11 server: X.Org 1.20.8 driver: ati,radeon unloaded: modesetting 
  alternate: fbdev,vesa display ID: :0.0 screens: 1 
  Screen-1: 0 s-res: 1920x1080 s-dpi: 96 s-size: 508x286mm (20.0x11.3") 
  s-diag: 583mm (23") 
  Monitor-1: HDMI-0 res: 1920x1080 hz: 60 dpi: 72 size: 673x284mm (26.5x11.2") 
  diag: 730mm (28.8") 
  OpenGL: renderer: AMD SUMO (DRM 2.50.0 / 4.19.141-2-MANJARO LLVM 10.0.1) 
  v: 3.3 Mesa 20.1.6 compat-v: 3.1 direct render: Yes 
Audio:
  Device-1: AMD BeaverCreek HDMI Audio [Radeon HD 6500D and 6400G-6600G series] driver: snd_hda_intel v: kernel bus ID: 00:01.1 chip ID: 1002:1714 
  Device-2: AMD FCH Azalia vendor: ASUSTeK driver: snd_hda_intel v: kernel 
  bus ID: 00:14.2 chip ID: 1022:780d 
  Sound Server: ALSA v: k4.19.141-2-MANJARO 
Network:
  Device-1: Qualcomm Atheros AR9485 Wireless Network Adapter vendor: AzureWave 
  driver: ath9k v: kernel port: e000 bus ID: 02:00.0 chip ID: 168c:0032 
  IF: wlp2s0 state: up mac: <filter> 
  Device-2: Qualcomm Atheros AR8151 v2.0 Gigabit Ethernet vendor: ASUSTeK 
  driver: atl1c v: 1.0.1.1-NAPI port: d000 bus ID: 03:00.0 chip ID: 1969:1083 
  IF: enp3s0 state: down mac: <filter> 
Drives:
  Local Storage: total: 465.76 GiB used: 6.38 GiB (1.4%) 
  SMART Message: Required tool smartctl not installed. Check --recommends 
  ID-1: /dev/sda vendor: Seagate model: ST9500325AS size: 465.76 GiB 
  block size: physical: 512 B logical: 512 B speed: 3.0 Gb/s 
  rotation: 5400 rpm serial: <filter> rev: SDM1 scheme: GPT 
Partition:
  ID-1: / raw size: 465.46 GiB size: 457.16 GiB (98.22%) used: 6.38 GiB (1.4%) 
  fs: ext4 dev: /dev/sda2 
Swap:
  Alert: No Swap data was found. 
Sensors:
  System Temperatures: cpu: 41.6 C mobo: N/A 
  Fan Speeds (RPM): N/A 
  GPU: device: radeon temp: 36 C device: radeon temp: 41 C 
Info:
  Processes: 163 Uptime: 2h 07m Memory: 3.34 GiB used: 888.9 MiB (26.0%) 
  Init: systemd v: 246 Compilers: gcc: N/A Packages: pacman: 905 lib: 274 
  Shell: Bash v: 5.0.18 running in: xfce4-terminal inxi: 3.1.05

What do you need? Whats missing?

Dont do that. Besides this being a generally bad idea for handling any software in linux (we use repositories and packages and such … and they usually are tied to things like system libraries)… manjaro also has MSM/mhwd to handle these things. Dont deviate from that unless you have a good reason and know what you are doing.

Please see this:

Thanks for your answer!

I want to use 2560 x 1080 resolution on my monitor, but it does not appear in the display configuration menu. I’ve tried the approaches mentioned above but nothing has worked.

Sorry. I edited the first post.

Hm.
I notice the 2 video cards… which is interesting … but I’m not entirely sure its down to your gpu(s) and/or drivers.

When you said

I guess that means you’ve done this:
https://wiki.archlinux.org/index.php/Xrandr#Adding_undetected_resolutions
?

Thanks for answering.

Yes. That’s exactly what I tried to do.
But when I apply the new mode, the monitor screen goes black.

I don’t know if it is related, but one of the LEDs on my notebook’s panel is continuos in blue color, which means it is only using the integrated GPU. And not the dedicated one.

Wouldn’t using the dedicated card have anything to do with this issue?

I installed Manjaro XFCE and updated everything on Pamac.

In hardware configurations, “video-linux” is installed and active, despite showing “video-modesetting” and “video-vesa” (not installed)

Should I install any more drivers? Where can I get it? How to install?