[Bug 93782] [i9xx TV][BISECT] vblank wait timeout on crtc

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93782

--- Comment #23 from Mariusz Mazur <mariusz.g.mazur at gmail.com> ---
I don't see myself having much success (or time for) bisecting this, so maybe
somebody else will find this info useful:

- 4.1 and 4.2 are perfectly fine (which is why I suggest 4.1.x for anybody
using gm965 and seeing this problem)
- 4.3-rc1 has a ton of i915/drm changes, which result in a (not obviously
harmful) call traces in kernel logs that end in drm_atomic_check_only()
- traces ending in drm_atomic_check_only persist into official 4.3.0, though
the full trace differs somewhat from 4.3rc1
- around 4.4-rc1 or 4.4-rc2 (I only have rc3 to test, but that has zero i915
changes in the commit log, so it must've been one one the former two)
drm_atomic_check_only disappears and the thread initiator, drm_wait_one_vblank
(along with "vblank wait timed out on crtc 0"), appears.
- this persists up until at least ubuntu's 4.8.0

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