I recently brought home a 1440p HDMI 60 Hz monitor. However, on Ubuntu and Fedora it has problems displaying correctly. Some images of the problem are here: https://imgur.com/a/GP2ce
Initially, I had Fedora installed, and thought it was a Fedora problem. Then, I wanted to try Ubuntu, figuring the VGA drivers might be different. I first loaded Ubuntu from the installation media, to try it out and voila! It worked! I decide to go ahead and install Ubuntu.
After I loaded Ubuntu from disk, my monitor started having the exact same problem it was having on Fedora.
The problem goes away when I set the monitor's resolution to 1080p.
Interestingly, the same problem appeared when the Ubuntu live USB version was loading. However, once it loaded, the problem went away!
What could the live version be doing that the installed version does not?
Edit: I tried running xrandr
on both Live and Installed versions of Ubuntu and the resulting difference was interesting:
Live
ubuntu-gnome@ubuntu-gnome:~$ xrandr
Screen 0: minimum 320 x 200, current 4480 x 1440, maximum 16384 x 16384
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-1 disconnected (normal left inverted right x axis y axis)
DisplayPort-2 disconnected (normal left inverted right x axis y axis)
HDMI-A-0 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 553mm x 311mm
2560x1440 59.95*+
1920x1080 60.00 60.00 50.00 59.94 30.00 25.00 24.00 29.97 23.98
1920x1080i 60.00 50.00 59.94
1680x1050 59.88
1280x1024 75.02 60.02
1440x900 59.90
1280x960 60.00
1280x800 59.91
1152x864 75.00
1280x720 60.00 50.00 59.94
1440x576 50.00
1024x768 75.03 70.07 60.00
1440x480 60.00 59.94
832x624 74.55
800x600 72.19 75.00 60.32 56.25
720x576 50.00
720x480 60.00 59.94
640x480 75.00 66.67 60.00 59.94
720x400 70.08
DVI-D-0 connected 1920x1080+2560+0 (normal left inverted right x axis y axis) 477mm x 268mm
1920x1080 60.00*+
1680x1050 59.88
1280x1024 75.02 60.02
1440x900 59.90
1280x960 60.00
1280x720 60.00
1024x768 75.03 70.07 60.00
832x624 74.55
800x600 72.19 75.00 60.32 56.25
640x480 75.00 72.81 66.67 59.94
720x400 70.08
Installed:
Screen 0: minimum 320 x 200, current 4480 x 1440, maximum 8192 x 8192
XWAYLAND0 connected 1920x1080+0+360 (normal left inverted right x axis y axis) 480mm x 270mm
1920x1080 59.96*+
XWAYLAND1 connected 2560x1440+1920+0 (normal left inverted right x axis y axis) 550mm x 310mm
2560x1440 59.91*+
Edit 2: Also, I realized that this graphics artifact is causing some sort of striping that basically shows basically every other column of the display and double its width. When I am typing on that display, every other letter appears.
I came up with a solution, though I'd love some expanded input on whether this is an acceptable long term solution.
I followed the screenshot here:
Which I found from the debugging Wayland page Using both GNOME Classic and GNOME on Xorg allowed me to correctly run the HDMI monitor at 1440p. I could back switch into the normal GNOME 3 desktop without problems.
It seems that the problem comes back when I boot into the default GNOME 3. All I have to do to resolve the problem is to log in under GNOME Classic then log out and back in under regular GNOME.
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