[Bug 101597] [BAT][PNV] pipe [AB] vblank wait timed out when running igt at kms_pipe_crc_basic@hang-read-crc-pipe-a/b

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101597

Maarten Lankhorst <bugs at mblankhorst.nl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|intel-gfx-bugs at lists.freede |bugs at mblankhorst.nl
                   |sktop.org                   |
             Status|NEW                         |ASSIGNED

--- Comment #2 from Maarten Lankhorst <bugs at mblankhorst.nl> ---
This bug only affects fi-pnv-d510, the one in farm 2 is unaffected.

I'm not sure when this was broken or if it was always broken, but the code
needs to disable CXSR during atomic modeset enable. When cxsr is active you get
no vblanks, which means you end up with this.

It will be fixed when converting the gen4- watermarks to atomic, the code
properly disables cxsr there. I've tested this bug and on nightly I hit it all
the time, while with atomic watermarks it's gone.

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