https://bugs.freedesktop.org/show_bug.cgi?id=107863

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 --> https://bugs.freedesktop.org/attachment.cgi?id=141478&action=edit 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!