Enabling larger resolutions in KDE

jb1223 · 2019-07-25 22:21:56

I'm running a dual-head setup. My smaller monitor works fine with its native resolution, but my larger monitor grays out when I attempt to use the native resolution. It's not a static gray - it's gray-blue, and it slowly oscillates between darker and lighter shades. Although the shade does seem to be a blend of the colors in my desktop background, I only notice the pulsing when it's like this. I can move my mouse to that screen (so it acknowledges the display is there), but I can't see the mouse while it is on that monitor.

By decreasing the resolution, I have managed to get it to work. I'm still running into some strange issues (sometimes I get a corrupted display and have to reboot X), but those may be unrelated.

The native resolution works on Windows 10, so I don't think it's a hardware issue.

Does anyone have any ideas about where I could start looking for a solution to this? I'm still digging, but I haven't really found anything yet. I have xrandr installed, and the output looks fine:

[jb@noisy-cricket ~]$ xrandr
Screen 0: minimum 320 x 200, current 4480 x 1328, maximum 16384 x 16384
DVI-I-1 disconnected (normal left inverted right x axis y axis)
DVI-D-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 connected 1920x1080+0+248 (normal left inverted right x axis y axis) 521mm x 293mm
   1920x1080     60.00*+  50.00    59.94  
   1680x1050     59.88  
   1600x900      60.00  
   1280x1024     75.02    60.02  
   1440x900      59.90  
   1280x800      59.91  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1024x768      75.03    70.07    60.00  
   832x624       74.55  
   800x600       72.19    75.00    60.32    56.25  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       75.00    72.81    66.67    60.00    59.94  
   720x400       70.08  
DP-1 connected primary 2560x1080+1920+0 (normal left inverted right x axis y axis) 797mm x 333mm
   3440x1440     99.98 +  59.97    49.99  
   2560x1440     59.95  
   2560x1080     60.00*   59.94  
   1920x1080     60.00    50.00    59.94  
   1680x1050     59.95  
   1600x900      60.00  
   1280x1024     75.02    60.02  
   1440x900      59.89  
   1280x800      59.81  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1024x768      75.03    70.07    60.00  
   832x624       74.55  
   800x600       72.19    75.00    60.32    56.25  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       75.00    72.81    66.67    60.00    59.94  
   720x400       70.08

seth · 2019-07-26 06:59:52

Try to suspend the compositor, a layout where the two outputs overlap, post the output of lspci and maybe try adding a modeline w/ reduced blanking: https://wiki.archlinux.org/index.php/Xr … esolutions

Arch Linux

#1 2019-07-25 22:21:56

Enabling larger resolutions in KDE

#2 2019-07-26 06:59:52

Re: Enabling larger resolutions in KDE

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