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#1 2018-10-13 21:02:28

edolnx
Member
Registered: 2018-10-13
Posts: 2

4k Display no longer working on RX480 system after updates

Greetings Everyone -

I have a FX-8350 based system with an RX-480 that runs two monitors. One is a Crossover 289K (3840x2960 native) and the other is a Crossover WQHD (2560x1440 native). They both worked until I did a recent upgrade (I was probably a month behind on `pacman -Syu`) and now I can only get the 4k monitor to display at 2560x1440. The other resolutions seem to sync (OSD shows the correct resolution and frame rate), and KDE thinks it's there, but there is no output. Both monitors are connected via DisplayPort. I have tried with the 4k via HDMI and that gives some strange output (it thinks it's now a laptop with an external monitor, and attempting screen orientation and rotation corrupts output on both displays). I'm using the `amdgpu` drivers and Xorg (which hasn't changed since prior to the update).

Some searching through these forums implies that 4k on the RX480 has always been touch and go. Is it time for me to bite the bullet and upgrade to a RX580? Any other suggestions?

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#2 2018-11-26 15:46:40

edolnx
Member
Registered: 2018-10-13
Posts: 2

Re: 4k Display no longer working on RX480 system after updates

Follow-up: Did a bunch of debugging over the weekend. After many false starts (EDID, DP cables, etc.) I discovered the problem seems to be related to 4.19 - rolling back to a previous kernel works fine. I'm unsure how to file a bug report with the AMDGPU kernel driver team, so for now I'm going to pin at an older version and wait for 4.20 and hope things improve...

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#3 2018-11-26 16:12:09

progandy
Member
Registered: 2012-05-17
Posts: 3,262

Re: 4k Display no longer working on RX480 system after updates

amdgpu has a bugtracker here: https://bugs.freedesktop.org/buglist.cg … _id=660709
You can add a new bug with "DRI" as the product and "DRM/AMDgpu" as the component.

Otherwise you can try the mailing list:
https://www.kernel.org/doc/html/latest/ … -bugs.html

$ ./scripts/get_maintainer.pl drivers/gpu/drm/amd/amdgpu/amdgpu.h 
[...]
amd-gfx@lists.freedesktop.org (open list:RADEON and AMDGPU DRM DRIVERS)
dri-devel@lists.freedesktop.org (open list:DRM DRIVERS)

Last edited by progandy (2018-11-26 16:13:28)


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