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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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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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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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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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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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