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Hi,
I recently purchased a QHD display and try to get it working with full resolution.
xrandr gives me the following:
Screen 0: minimum 8 x 8, current 5200 x 1080, maximum 32767 x 32767
eDP1 connected primary 1600x900+0+0 (normal left inverted right x axis y axis) 310mm x 170mm
1600x900 60.00*+ 59.82
1400x900 59.96 59.88
1368x768 60.00 59.88 59.85
1280x800 59.81 59.91
1280x720 59.86 60.00 59.74
1024x768 60.00
1024x576 60.00 59.90 59.82
960x540 60.00 59.63 59.82
800x600 60.32 56.25
864x486 60.00 59.92 59.57
800x450 60.00
640x480 59.94
720x405 59.51 60.00 58.99
640x360 59.84 59.32 60.00
DP1 disconnected (normal left inverted right x axis y axis)
DP2 connected 1680x1050+3520+0 (normal left inverted right x axis y axis) 490mm x 320mm
1680x1050 59.88*+ 59.95
1280x1024 75.02 60.02
1440x900 74.98 59.89
1280x960 60.00
1152x864 75.00
1024x768 75.03 60.00
832x624 74.55
800x600 75.00 60.32 56.25
640x480 75.00 59.94
720x400 70.08
HDMI1 connected 1920x1080+1600+0 (normal left inverted right x axis y axis) 730mm x 430mm
1920x1080 60.00* 50.00 59.94
1920x1080i 60.00 50.00 59.94
1280x1440 59.91
1680x1050 59.88
1280x1024 75.02 60.02
1440x900 59.90
1280x960 60.00
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
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
where HDMI1 is the display that should have QHD resolution available. I tried it out in windows and the resolution is possible there.
I found https://bbs.archlinux.org/viewtopic.php?id=179120 thread and tried adding the resolutions manually. 60 hertz gives me the following output:
xrandr: Configure crtc 0 failed
, 33 and 40 hertz are apparently not supported by the monitor (it shows me something like input not supported). the displayed resolutions by xrandr work just fine. I'm on the i915 kernel driver. What should I do? Thanks in advance.
Last edited by moeetz (2018-02-01 13:04:24)
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Double check what is the maximum resolution and highest HDMI version supported by the output of your the graphics card. According to this[1] your card needs to support at least HDMI 1.3, also make sure that the cable is able to support the high data rate needed for QHD.
R00KIE
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Thanks for the suggestion! According to https://communities.intel.com/message/210828#210828 my graphics card supports QHD. (intel hd 4400). also, I tried it under windows and it worked, so the hardware must support it.
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i (partially) solved it, the problem was the 60 hertz. 33 and 40 hertz were not supported by the display, but as it turns out 50 is. now the only question remaining is how to make this new mode persistent, but xorg conf files seem to be the way to go
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to make it permanent, i created a file /etc/X11/xorg.conf.d/10-monitor.conf with the following content:
Section "Monitor"
Identifier "HDMI1"
Modeline "2560x1440_50.00" 256.25 2560 2736 3008 3456 1440 1443 1448 1484 -hsync +vsync
Option "PreferredMode" "2560x1440_50.00"
EndSection
and it works
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