Bug 198713
| Summary: | AMD DC crashes when computing clocks/detecting freesync | ||
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| Product: | Drivers | Reporter: | Jon (jon) |
| Component: | Video(DRI - non Intel) | Assignee: | drivers_video-dri |
| Status: | NEW --- | ||
| Severity: | normal | CC: | andrey.grodzovsky, bjo, harry.wentland, mike, nicholas.johnson-opensource |
| Priority: | P1 | ||
| Hardware: | x86-64 | ||
| OS: | Linux | ||
| Kernel Version: | 4.15.1-7 | Subsystem: | |
| Regression: | No | Bisected commit-id: | |
| Attachments: |
dmesg output
kernel config from /boot dmesg for kernel 4.17 showing warnings with traces |
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Created attachment 274055 [details]
kernel config from /boot
You don't need amdgpu.dc=1 set, it's already enabled in the .config that you provided: CONFIG_DRM_AMD_DC = y CONFIG_DRM_AMD_DC_PRE_VEGA = y As a workaround try amdgpu.dc=0 (In reply to Mike Lothian from comment #2) > As a workaround try amdgpu.dc=0 Well spotted. Workaround has stopped the traces as you'd expect. It's also stopped the weird blue flicker I was getting in KDE with OGL3 compositor (different DC bug). I hope the above is useful for getting PRE_VEGA out of experimental! Missing from original report, it's 3x BenQ XL2730Z, all display port. I did not find this when posting my bug. This might be the same thing. Except mine is two whole kernel versions newer, and it is still doing it. AMD do not seem to be taking Linux seriously.... https://bugzilla.kernel.org/show_bug.cgi?id=199917 Could somebody who knows the ropes around here poke the AMD driver team for us? Thank you! It's not a crash but a warning over invalid reg fields access - here https://elixir.bootlin.com/linux/v4.15.1/source/drivers/gpu/drm/amd/display/dc/dm_services.h#L132 I see you are working with 4.15 kernel, can you take the latest stable from here - https://www.kernel.org/ and see if problem goes away ? For quicker response time you can try submitting tickets to Free Desktop Bugzilla - https://bugs.freedesktop.org/ Andrey If you are referring to my comment, mine was with 4.17 kernel (latest stable release). I was just commenting on this one (4.15) because it looks like the same bug, and I am highlighting that they still have not fixed it in 4.17. Well, the dmesg attached is also from 4.15 kernel so I assumed it's all 4.15. Anyway, I will Harry from our Display team to take a look at this. Updated to 4.17 as per (indirect) request :) Linux mudkip.farm 4.17.1-6-default #1 SMP PREEMPT Tue Jun 12 09:55:31 UTC 2018 (e721478) x86_64 x86_64 x86_64 GNU/Linux Created attachment 276531 [details]
dmesg for kernel 4.17 showing warnings with traces
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Created attachment 274053 [details] dmesg output Fury X w/ BenQ XL2730Z connected with DisplayPort amdgpu.dc=1 is NOT set. See attached dmesg for 12 traces related to DC. It looks to be crashing whilst detecting/computing clocks when freesync is detected. I've not set it to be enabled.