[Bug 211501] New: Kernel freeze when waking monitor from blanking / DPMS (AMDGPU / DC)

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=211501

            Bug ID: 211501
           Summary: Kernel freeze when waking monitor from blanking / DPMS
                    (AMDGPU / DC)
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.10.11
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: borisovjasen at protonmail.com
        Regression: No

Created attachment 295021
  --> https://bugzilla.kernel.org/attachment.cgi?id=295021&action=edit
relevant dmesg output after kernel recovered from freeze

Occasional temporary kernel freeze when monitor wakes up.

The freeze only happens sometimes (which makes it hard to reproduce). Most of
the time, it wakes up just fine.

The last time it happened, I decided to wait, rather than resetting the
computer, and the system recovered after some time (less than a minute).

My graphics card is a Radeon RX Vega 64. CPU is Intel i7-7700K.

I have 2 connected monitors:
 - Gigabyte G27QC connected via DisplayPort, running at its highest mode:
2560x1440 at 165Hz.
 - Samsung SyncMaster 2243WM connected via HDMI through a DvI adapter, also at
its highest mode: 1680x1050 at 60Hz

I don't know if the issue will occur if only one of the two monitors is
connected; as I said, the bug is hard to reproduce.

I am using the `sway` wayland compositor.

After the system recovered from the freeze, I obtained the relevant `dmesg`
output. I am attaching it as `dmesg-post-freeze.txt` (with relative
timestamps).

I am also attaching `dmesg-boot.txt` with the kernel messages from the system
booting, in case you need it for more info about my system.

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