[Bug 111846] Suspend to RAM cause screen to glitch on navi10

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111846

            Bug ID: 111846
           Summary: Suspend to RAM cause screen to glitch on navi10
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: not set
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: yshuiv7 at gmail.com

To reproduce:

1. have two monitors (not sure if necessary, also the two monitors i have have
different resolutions)
2. suspend computer to ram
3. wake up computer
4. screen flickers

Observation:

1. set pp_dpm_mclk immediately fix the problem
2. after step 1, set power_dpm_force_performance_level to "auto", then the
problem reappears.
3. flicker doesn't occur on vconsole

Software Versions:

This bug occurs on linux 5.3.0, xorg 1.20.5, mesa 19.3.0 40087ffc5b9

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