[Bug 91467] SIGSEGV "get_fb: failed to add fb" / sna_block_handler

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91467

--- Comment #5 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to Andreas Reis from comment #4) 
> (Also, I forgot: The tearing with compton only appears when I enable its
> glx-use-copysubbuffermesa, which is explicitly marked as potential vsync
> breaker in its manpage.)

Indeed, it is not. DRI3 doesn't even try. DRI2 managed to be broken (no one
specified whether it should or should not be synchronized to the vertical
refresh and then X implemented it using the same routine for fast tearing
flips), and even then on your hardware it requires an X server running with
root privileges to be allowed to reconfigure the registers on the fly to enable
vsync.

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