[Bug 97778] Screen blanks for 2 seconds

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97778

--- Comment #1 from Paul Menzel <pmenzel at molgen.mpg.de> ---
I do not know how to reproduce this, but it happens quite often. The DRM debug
level is increased, and these messages are reported by Linux when this
happened.

```
[Wed Sep 14 11:09:46 2016] [drm:skl_update_scaler_plane] Updating scaler for
[PLANE:23:plane 1A] scaler_user index 0.0
[Wed Sep 14 11:09:46 2016] [drm:skl_wm_flush_pipe] flush pipe A (pass 3)
[Wed Sep 14 11:09:46 2016] [drm:skl_update_scaler_plane] Updating scaler for
[PLANE:23:plane 1A] scaler_user index 0.0
[Wed Sep 14 11:09:46 2016] [drm:skl_wm_flush_pipe] flush pipe A (pass 3)
[Wed Sep 14 11:09:46 2016] [drm:skl_wm_flush_pipe] flush pipe A (pass 3)
[Wed Sep 14 11:10:02 2016] [drm:skl_update_scaler_plane] Updating scaler for
[PLANE:23:plane 1A] scaler_user index 0.0
[Wed Sep 14 11:10:02 2016] [drm:skl_wm_flush_pipe] flush pipe A (pass 3)
[Wed Sep 14 11:10:02 2016] [drm:skl_update_scaler_plane] Updating scaler for
[PLANE:23:plane 1A] scaler_user index 0.0
[Wed Sep 14 11:10:02 2016] [drm:skl_wm_flush_pipe] flush pipe A (pass 3)
[Wed Sep 14 11:10:02 2016] [drm:skl_wm_flush_pipe] flush pipe A (pass 3)
```

I believe it happened at 11:10:02, though there is unfortunately no difference
from the message before.

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