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#1 2018-08-19 17:55:50

JonnyRobbie
Member
Registered: 2015-04-28
Posts: 170

Suddenly, I cannot set 144hz in xrandr, but only 120hz

I have to admit that I don't know what has changed. I did an upgrade, but I don't know, if that is the cause.
My graphic card is AMD RX580, 144hz QHD monitor. A few days ago, I could set 144 hz completely normally,
but today I noticed that I can go only up to 120hz:

$ xrandr
Screen 0: minimum 320 x 200, current 4240 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 connected primary 2560x1440+1680+0 (normal left inverted right x axis y axis) 597mm x 336mm
   2560x1440     59.95 + 119.88*   99.95    84.98  
   1920x1200     59.95  
   1920x1080    143.85    60.00    60.00    50.00    59.94  
   1600x1200     59.95  
   1680x1050     59.95  
   1280x1024     75.02    60.02  
   1440x900      59.89  
   1280x960      60.00  
   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  
HDMI-A-0 connected 1680x1050+0+0 (normal left inverted right x axis y axis) 433mm x 270mm
   1680x1050     59.95*+
   1280x1024     75.02    60.02  
   1440x900      59.95  
   1280x800      59.95  
   1152x864      75.00  
   1280x720      59.95  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   640x480       75.00    59.94  
   720x400       70.08  
DVI-D-0 disconnected (normal left inverted right x axis y axis)

$ uname -roms
Linux 4.18.1-arch1-1-ARCH x86_64 GNU/Linux

$ pacman -Qi mesa | grep Version
Version         : 18.1.6-1

As far as I know, I have properly set DP1.2 on my monitor. Is anyone experiencing similar issue? What could have been the cause?

EDIT: I tried downgrading to 4.14.17 and the option is back:

$ xrandr
Screen 0: minimum 320 x 200, current 4240 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 connected primary 2560x1440+1680+0 (normal left inverted right x axis y axis) 597mm x 336mm
   2560x1440     59.95 + 143.86*  119.88    99.95    84.98  
   1920x1200     59.95  
   1920x1080    143.85    60.00    60.00    50.00    59.94  
   1600x1200     59.95  
   1680x1050     59.95  
   1280x1024     75.02    60.02  
   1440x900      59.89  
   1280x960      60.00  
   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  
HDMI-A-0 connected 1680x1050+0+0 (normal left inverted right x axis y axis) 433mm x 270mm
   1680x1050     59.95*+
   1280x1024     75.02    60.02  
   1440x900      59.95  
   1280x800      59.95  
   1152x864      75.00  
   1280x720      59.95  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   640x480       75.00    59.94  
   720x400       70.08  
DVI-D-0 disconnected (normal left inverted right x axis y axis)

$ uname -roms 
Linux 4.17.14-arch1-1-ARCH x86_64 GNU/Linux

So it is a kernel issue. Is there anything I can do besides wait for the patch or live on 4.17?

Last edited by JonnyRobbie (2018-08-19 18:29:13)

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#2 2018-08-19 23:03:04

V1del
Forum Moderator
Registered: 2012-10-16
Posts: 21,412

Re: Suddenly, I cannot set 144hz in xrandr, but only 120hz

If you don't need the features it brings (predominantly HDMI audio) try disabling DC with

amdgpu.dc=0

on your kernel parameters.

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#3 2018-08-20 05:49:03

JonnyRobbie
Member
Registered: 2015-04-28
Posts: 170

Re: Suddenly, I cannot set 144hz in xrandr, but only 120hz

Well, I might try that, but as far as I know, DC came with 4.15, right? And it is fine even with 4.17.

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#4 2018-08-21 14:29:49

JonnyRobbie
Member
Registered: 2015-04-28
Posts: 170

Re: Suddenly, I cannot set 144hz in xrandr, but only 120hz

Hmm, ok, it worked. I'm on 4.18.3 and got my 144hz, but is still feels like some kind of regression. It wasn't a problem at 4.17. Is there an associated kernel bug?

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#5 2018-10-16 15:09:08

Awesome Donkey
Member
Registered: 2016-04-02
Posts: 2

Re: Suddenly, I cannot set 144hz in xrandr, but only 120hz

I'm experiencing this myself too - I'm glad I'm not the only one! I'd also like to know if there's an associated kernel bug (or if the amdgpu devs are aware of this issue). Wonder what changed in 4.18 to cause this?

I thought about trying the 4.19-rc8 kernel or linux-amd-staging-drm-next-git to see if it's been fixed there, but I'll wait until the final 4.19 hits the Arch repo.

Last edited by Awesome Donkey (2018-10-16 15:11:21)

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