[Bug 94685] Recent change makes Xorg hangs

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94685

--- Comment #4 from Chris Wilson <chris at chris-wilson.co.uk> ---
So I think it was just because the test should be for 31bits and not 32bits (or
at least you hit the same bug I just reproduced in a testcase here):

commit c186d4dda3b62b73af3caf2883a9cedfd97e3b45
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Thu Mar 24 18:22:20 2016 +0000

    sna/present: Restrict vblank.sequence range to 31bits

    The kernel checks for past vblanks using an int32_t comparison, so we
    can only program up to 31bits into the future (and similarly programing
    a timer that large would also overflow).

    References: https://bugs.freedesktop.org/show_bug.cgi?id=94685
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

The debug log would still be very helpful, thanks.

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