Bug 107863 - Kernel panic when external monitors go blank
Summary: Kernel panic when external monitors go blank
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/AMDgpu (show other bugs)
Version: XOrg git
Hardware: x86-64 (AMD64) Linux (All)
: medium major
Assignee: Default DRI bug account
QA Contact:
Depends on:
Reported: 2018-09-07 22:34 UTC by Ainola
Modified: 2019-11-19 08:54 UTC (History)
3 users (show)

See Also:
i915 platform:
i915 features:

kernel panic (37.17 KB, text/plain)
2018-09-07 22:34 UTC, Ainola
no flags Details

Description Ainola 2018-09-07 22:34:33 UTC
Created attachment 141478 [details]
kernel panic

This is a follow-up from bug https://bugs.freedesktop.org/show_bug.cgi?id=105018. If I leave my laptop in its dock (one HDMI and one DisplayPort) it has a high chance of kernel panicking when DPMS turns the displays off. This affects my Dell Precision 7720 with a Radeon Pro WX 7100 on Archlinux, kernel 4.18.5. My boot parameters include amdgpu.dc=1 (a redundant option nowadays, I know, I forgot to remove this option). Suspend/resume work are fine, this happens only immediately after idle blanking. As far as I can tell this does not occur when using only the laptop screen but I could be wrong as I spend the majority of my time on the dock.

I've attached a kernel log. For now I work around the issue by disabling dpms entirely.

Thank you!
Comment 1 Ainola 2018-09-07 22:36:06 UTC
I should also note that a very similar software (desktop) setup with a Vega 64 card has no such issue with an external displayport monitor.
Comment 2 Martin Peres 2019-11-19 08:54:34 UTC
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