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#1 2018-02-01 10:40:32

moeetz
Member
Registered: 2016-10-10
Posts: 12

[SOLVED] xrandr not detecting QHD

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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#2 2018-02-01 11:15:26

R00KIE
Forum Fellow
From: Between a computer and a chair
Registered: 2008-09-14
Posts: 4,734

Re: [SOLVED] xrandr not detecting QHD

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.

[1] https://en.wikipedia.org/wiki/HDMI#Version_comparison


R00KIE
Tm90aGluZyB0byBzZWUgaGVyZSwgbW92ZSBhbG9uZy4K

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#3 2018-02-01 11:40:30

moeetz
Member
Registered: 2016-10-10
Posts: 12

Re: [SOLVED] xrandr not detecting QHD

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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#4 2018-02-01 12:52:41

moeetz
Member
Registered: 2016-10-10
Posts: 12

Re: [SOLVED] xrandr not detecting QHD

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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#5 2018-02-01 13:03:45

moeetz
Member
Registered: 2016-10-10
Posts: 12

Re: [SOLVED] xrandr not detecting QHD

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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