[Bug 111659] Kernel panic when waking up after screens go to dpms sleep

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Wed Sep 11 11:39:00 UTC 2019


            Bug ID: 111659
           Summary: Kernel panic when waking up after screens go to dpms
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: not set
         Component: DRM/Radeon
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: brad at fnarfbargle.com

Created attachment 145332
  --> https://bugs.freedesktop.org/attachment.cgi?id=145332&action=edit
Multiple instances of the Panic

iMac late 2011 with 2 Thunderbolt displays.

Kernel 5.2 finally got DP routing working to allow both TB displays to work,
however I'm now getting lockups which appear to be triggered in  

I'm capturing these over netconsole as it leaves the machine paralysed.

Attachment faults.txt has 4 separate instances of the fault from 4 different

This machine stays on 24/7 and this seems to occur when the displays wake up
after a dpms sleep. Having said that I've also seen the fault when doing
something innocuous like changing the audio volume.

Generally at least 2 of the screens wakeup, so I have displays with a
lockscreen asking for a password and a mouse, but the machine is dead. 

The last example in faults.txt left the machine in a state where I could ssh in
and reboot it. All the others required a hard power cycle.

I'm currently using 5.2.11. Previously I was using 4.17, but I can't roll back
prior to 5.2 without losing the second TB display, and it can take hours or
days to hit so bisection would be difficult.

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Blackcomb [Radeon HD 6970M/6990M] (prog-if 00 [VGA controller])
        Subsystem: Apple Inc. Radeon HD 6970M
        Flags: bus master, fast devsel, latency 0, IRQ 79
        Memory at 90000000 (64-bit, prefetchable) [size=256M]
        Memory at a8800000 (64-bit, non-prefetchable) [size=128K]
        I/O ports at 2000 [size=256]
        Expansion ROM at a8820000 [disabled] [size=128K]
        Capabilities: [50] Power Management version 3
        Capabilities: [58] Express Legacy Endpoint, MSI 00
        Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010
        Capabilities: [150] Advanced Error Reporting
        Kernel driver in use: radeon
        Kernel modules: radeon

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