[Bug 96419] [SKL] vblank not available on crtc 0, ret=-22 (makes X freeze)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96419

--- Comment #15 from Timur Alperovich <timur.alperovich at gmail.com> ---
I do not encounter X freezing, but the "vblank not available on crtc 0" shows
up on startup using drm-intel-nightly from 07/29/2016. I don't know if this is
related or not, but I also encounter mouse cursor issues in Gnome: the cursor
leaves trailing marks when moving to the notification bar and flickers when
moving over controls. I do not observe these problems using 4.7 rc2 built from
the same branch on 06/13/2016. I had the same problems with rc6 and rc7, but
was hoping it may be fixed.

The cursor also disappears when mousing over chrome tab headers. This makes it
fairly difficult to use.

Here's an example of what the cursor artifacts look like:
https://goo.gl/photos/MbwQmsjH9fySdqPX9

Let me know what, if any other, debugging information may be useful to
reproduce this.

This is on Skylake on Dell XPS 13. The cursor artifacts only show up when I
connect an external monitor (Dell p2715q). I'm using DP to connect the monitor
-- I don't know if that makes a difference.

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