[Bug 98810] [g4x] Desktop hang with drm:drm_atomic_helper_commit_cleanup_done "flip_done timed out"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98810

Leho Kraav (:macmaN :lkraav) <leho at kraav.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|CLOSED                      |REOPENED
         Resolution|FIXED                       |---

--- Comment #22 from Leho Kraav (:macmaN :lkraav) <leho at kraav.com> ---
(Dell 7480, Intel HD 620 rev 02)

PROBLEM I upgraded kernel 4.14 -> 4.16 and am now seeing the desktop
consistently hang after boot, near immediately after gdm launches. As in, I
can't choose a user from the list, because mouse freezes in a few seconds.

I see the bug subject keywords in systemd journal as the only visible error
(i915 debug not enabled):

```
apr   21 10:55:54 papaya kernel: [drm:drm_atomic_helper_wait_for_flip_done
[drm_kms_helper]] *ERROR* [CRTC:37:pipe A] flip_done timed out
```

My `i915` configuration has traditionally been `options i915 enable_rc6=1
enable_fbc=1 enable_psr=1` and it has worked without issues on older kernels.

I learned 4.16 eliminated the `enable_rc6` parameter, so we can rule this one
out.

SOLUTION commenting out `enable_fbc=1 enable_psr=1` seems to have restored
operational capacity and the system has not frozen for several hours.

It does seem like REOPENED is the correct status here?

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