[Bug 75502] [SNB, IVB] Page flips hang indefinitely, apparently waiting for mmio writes that never happen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75502

--- Comment #9 from Simon Farnsworth <simon at farnz.org.uk> ---
I can confirm that it didn't occur with kernel 3.5.0, libdrm-2.4.46, Mesa
9.1.3, Xorg server 1.11.4 and DDX 2.21.6. It does occur now that I've pulled
forward from Fedora 16 with backports to Fedora 20.

If there are good starting points to try, I can take a machine backwards and
see if that improves matters; I'd need to know which bits to change, though.

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