[Bug 58107] [sna gm45] Lockups in X on 2.20.15, flip-vs-dpms? race

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=58107

--- Comment #13 from Elvis Pranskevichus <el at prans.net> ---
Locks up under 3.8 as well.  I booted with drm.debug=0x06 and dmesg is full of
this:

[drm:i915_pageflip_stall_check], Pageflip stall detected
[drm:intel_update_fbc], more than one pipe active, disabling compression
[drm:intel_prepare_page_flip], preparing flip with no unpin work?
[drm:intel_update_fbc], more than one pipe active, disabling compression
[drm:intel_update_fbc], more than one pipe active, disabling compression
[drm:intel_update_fbc], more than one pipe active, disabling compression
[drm:intel_update_fbc], more than one pipe active, disabling compression
[drm:intel_update_fbc], more than one pipe active, disabling compression
[drm:i915_pageflip_stall_check], Pageflip stall detected
[drm:intel_update_fbc], more than one pipe active, disabling compression

I was also hoping to be able to bisect the driver, but the whole xorg-server
API thing doesn't make it easy.

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