[Bug 77244] New: UVD microcode fails to load on HD 8970M (Neptune XT -- PITCAIRN)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77244

          Priority: medium
            Bug ID: 77244
          Assignee: dri-devel at lists.freedesktop.org
           Summary: UVD microcode fails to load on HD 8970M (Neptune XT --
                    PITCAIRN)
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: nmschulte at gmail.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Radeon
           Product: DRI

Created attachment 97143
  --> https://bugs.freedesktop.org/attachment.cgi?id=97143&action=edit
Linux kernel log

I have a Clevo P150SM based laptop with an Intel HD 4600 iGPU and an AMD
Radeon HD 8970M dGPU.  I receive the following errors when the Radeon
DRI/DRM implementation attempts to initialize the card:

[   65.525470] [drm:uvd_v1_0_start] *ERROR* UVD not responding, trying to reset
the VCPU!!!
[   66.537637] [drm:uvd_v1_0_start] *ERROR* UVD not responding, trying to reset
the VCPU!!!
[   67.549797] [drm:uvd_v1_0_start] *ERROR* UVD not responding, trying to reset
the VCPU!!!
[   68.561967] [drm:uvd_v1_0_start] *ERROR* UVD not responding, trying to reset
the VCPU!!!
[   69.574142] [drm:uvd_v1_0_start] *ERROR* UVD not responding, trying to reset
the VCPU!!!
[   70.586334] [drm:uvd_v1_0_start] *ERROR* UVD not responding, trying to reset
the VCPU!!!
[   71.598533] [drm:uvd_v1_0_start] *ERROR* UVD not responding, trying to reset
the VCPU!!!
[   72.610705] [drm:uvd_v1_0_start] *ERROR* UVD not responding, trying to reset
the VCPU!!!
[   73.622877] [drm:uvd_v1_0_start] *ERROR* UVD not responding, trying to reset
the VCPU!!!
[   74.635068] [drm:uvd_v1_0_start] *ERROR* UVD not responding, trying to reset
the VCPU!!!
[   74.654938] [drm:uvd_v1_0_start] *ERROR* UVD not responding, giving up!!!
[   74.654955] [drm:si_startup] *ERROR* radeon: failed initializing UVD (-1).


This appears to happen on video mode changes or vtty changes, I'm not
quite sure really what triggers it other than initial loading.  When it
does occur, the system appears to hang for a short time (15 seconds or
so) while the dGPU is active, and then "comes back" after the dGPU is
disabled.  The Clevo P150SM has an LED showing the dGPU power state,
and debugfs/vgaswitcheroo seems to corroborate this.

I'm also experiencing issues with PRIME (and e.g. xserver seg-faults when
building from source to try new code), but this issue exists out of the box on
Debian Sid, and seems to persist even with newer Mesa and DRM.  I have a bug
report for the PRIME/hybrid graphics issue as well, and it may end up that
these are related: https://bugs.freedesktop.org/show_bug.cgi?id=77094

Finally, this bug looks similar to mine, though I am not messing with PRIME (at
least explicitly; no xrandr --setprovider* calls and no DRI_PRIME env. var. is
set): https://bugs.freedesktop.org/show_bug.cgi?id=75234

There is a downstream bug report here:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=743659

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