I have a problem with dual displays and 2k resolution

dox4 · 2020-06-09 02:59:44

hello everyone,

im using debian with xfce4 desktop environment.

and these days i've bought a new display which supports 2k resolution (2560x1440)

but i cannot set the correct resolution, in the `Display` setting dialog, it only provide 1920x1080 and 1920x1200 but no higher.

below is the output of my `neofetch`:
```
OS: Debian GNU/Linux 10 (buster) x86_64
Host: MS-7B84 2.0
Kernel: 4.19.0-9-amd64
Uptime: 16 hours
Packages: 3319 (dpkg)
Shell: zsh 5.7.1
Resolution: 1080x1920, 1920x1080
DE: Xfce
WM: Xfwm4
WM Theme: Dark-Olympic
Theme: Adwaita-dark [GTK2], Dark-Olympic [GTK3]
Icons: Tango [GTK2], nuoveXT2 [GTK3]
Terminal: xfce4-terminal
Terminal Font: Iosevka Term SS14 Medium 18
CPU: AMD Ryzen 5 2600X (12) @ 3.600GHz
GPU: AMD ATI Radeon HD 6770
Memory: 16815MiB / 32180MiB
```

the GPU is a bit old, but i think it could support 2k resolution.

any ideas?

thank you.

Last edited by dox4 (2020-06-09 03:00:47)

ToZ · 2020-06-09 10:40:51

Hello and welcome.

What connection are you using? I believe HDMI only supports up to 1900x1200. You may need to use the DVI-I or Display Port connections.

What does "xrandr" return?

dox4 · 2020-06-09 12:51:12

i tried HDMI and VGA, none of them works.
here is xrandr returns:

```
Screen 0: minimum 320 x 200, current 3000 x 1920, maximum 8192 x 8192
HDMI-0 connected 1920x1080+0+840 (normal left inverted right x axis y axis) 527mm x 293mm
1920x1080 60.00*+ 50.00 59.94
1920x1080i 60.00 50.00 59.94
1680x1050 59.88
1600x900 60.00
1280x1024 75.02 72.05 60.02
1440x900 74.98 59.90
1366x768 59.79
1280x800 59.91
1152x864 75.00
1280x768 59.87
1280x720 60.00 50.00 59.94
1024x768 75.03 70.07 60.00
800x600 72.19 75.00 60.32
720x576 50.00
720x480 60.00 59.94
640x480 75.00 72.81 66.67 60.00 59.94
720x400 70.08
DVI-0 disconnected (normal left inverted right x axis y axis)
VGA-0 connected primary 1080x1920+1920+0 left (normal left inverted right x axis y axis) 527mm x 296mm
1920x1200 59.95 +
1920x1080 60.00*
1680x1050 59.95
1600x900 60.00
1280x1024 60.02
1440x900 59.89
1280x800 59.81
1280x720 60.00
1024x768 60.00
800x600 60.32
640x480 59.94
720x400 70.08
```

ToZ · 2020-06-09 14:06:39

The X server is only recognizing those smaller resolutions. This isn't really an Xfce issue.

Here is an interested thread from the Mint forums on a similar problem and the solution being with using a proper hdmi cable (one that supports 1.4a) and a custom modeline.

eriefisher · 2020-06-09 14:10:12

Which driver are you using? That could be the limiting factor.

dox4 · 2020-06-10 03:07:14

yes, now i think it's not about xfce itself, but about the driver.

here is the info about driver:

$ sudo dpkg --list | grep radeon
ii libdrm-radeon1:amd64 2.4.97-1 amd64 Userspace interface to radeon-specific kernel DRM services -- runtime
ii libdrm-radeon1:i386 2.4.97-1 i386 Userspace interface to radeon-specific kernel DRM services -- runtime
ii xserver-xorg-video-radeon 1:19.0.1-1 amd64 X.Org X server -- AMD/ATI Radeon display driver

it's the latest driver in debian repository.

my hdmi cable is ok, but the customer modeline just doesnot work.

eriefisher · 2020-06-10 11:50:51

https://wiki.archlinux.org/index.php/Xr … esolutions

Might help.

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#1 2020-06-09 02:59:44

I have a problem with dual displays and 2k resolution

#2 2020-06-09 10:40:51

Re: I have a problem with dual displays and 2k resolution

#3 2020-06-09 12:51:12

Re: I have a problem with dual displays and 2k resolution

#4 2020-06-09 14:06:39

Re: I have a problem with dual displays and 2k resolution

#5 2020-06-09 14:10:12

Re: I have a problem with dual displays and 2k resolution

#6 2020-06-10 03:07:14

Re: I have a problem with dual displays and 2k resolution

#7 2020-06-10 11:50:51

Re: I have a problem with dual displays and 2k resolution

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