Bug ID 107863
Summary Kernel panic when external monitors go blank
Product DRI
Version XOrg git
Hardware x86-64 (AMD64)
OS Linux (All)
Status NEW
Severity major
Priority medium
Component DRM/AMDgpu
Assignee dri-devel@lists.freedesktop.org
Reporter bugs@i--b.com

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!


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