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

[bugzilla-daemon at freedesktop.org]

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

yann <yann.argotti at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|intel-gfx-bugs at lists.freede |matthew.d.roper at intel.com
                   |sktop.org                   |
           Priority|medium                      |highest
            Summary|[SKL] vblank not available  |[SKL/APL] vblank not
                   |on crtc 0, ret=-22 (makes X |available on crtc 0,
                   |freeze)                     |ret=-22 (makes X freeze on
                   |                            |SKL)
      i915 features|                            |watermark
      i915 platform|                            |BXT

--- Comment #1 from yann <yann.argotti at intel.com> ---
Looking at the logs for APL (from bug 86767), I am noticing that this looks
like same root cause than also for bug 96229 (checked logs on bug 86767 and bug
96229)
=> vblank not available on crtc 0, ret=-22
which btw appeared in bug 89108 and was fixed on previous platforms with 

commit f9b61ff6bce9a44555324b29e593fdffc9a115bc
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Wed Jan 7 13:54:39 2015 +0100

    drm/i915: Push vblank enable/disable past encoder->enable/disable

now is back.

We encountered that issue running some kms_rotation_crc igt subtests or some 
kms_flip subtests

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