Hi all,

I have been struggling to find a good way to use my 4k display. For context, I 
have looked for setting HiDPI, am aware of 
https://github.com/QubesOS/qubes-issues/issues/1951 and others, but at least 
for now I see HiDPI as a half solution.

I don't care about my full screen resolution in Qubes, so I am ok in setting it 
to something like 1920x1080, the issue is I am not being able to. Since the 
only mode available in xrandr is 3840x2160 I am forced to add a new mode.

I ran cvt 1920 1080 60 in dom0, get:

Modeline "1920x1080 60.00" 173.00  1920 2048 2248 2576   1080 1083 1088 1120 
-hsync +vsync

I --newmode and --addmode to default and when I try setting the mode:

xrandr --verbose --output default --mode 1920x1080_60.00
xrandr: Failed to get size of gamma for output default
crtc 0: disable
screen 0: 1920x1080 508x286 mm  95.92dpi
crtc 0: 1920x1080_60.00  59.96 +0+0 "default"
xrandr: Configure crtc 0 failed
crtc 0: disable
screen 0: revert
crtc 0: revert

I have tried a few things, ran out of ideas, sorry if this is a bit too basic 
but am a bit stuck.

Best.
David

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