[Bug 42035] no way to turn off vsync

[Michal Suchanek]

2011/10/26 Michel Dänzer <michel at daenzer.net>:
> On Mit, 2011-10-26 at 12:05 +0200, Michal Suchanek wrote:
>> 2011/10/26 Michel Dänzer <michel at daenzer.net>:
>> > On Die, 2011-10-25 at 20:41 +0200, Michal Suchanek wrote:
>> >> 2011/10/25 Michel Dänzer <michel at daenzer.net>:
>> >> > On Mon, 2011-10-24 at 23:23 +0200, Michal Suchanek wrote:
>> >> >> With this patch it should be at least possible to turn off all this
>> >> >> when it does not work.
>> >> >
>> >> > Exactly. So, have you had a chance to try it?
>> >>
>> >> I installed the packages I built yesterday. The patch has no visible effect.
>> >
>> > Well, I do see an effect in the log file:
>> >
>> > [2558366.995] (==) RADEON(0): SwapBuffers wait for vblank: disabled
>> >
>> >
>> >> > Does it address your bug report?
>> >>
>> >> I am not quite sure.
>> >
>> > The above means the thing the bug report complains about being
>> > impossible to disable is disabled.
>>
>> Still it is disabled without the patch too, which it supposedly should not.
>
> I don't see how that can be the case with a driver built from unpatched
> upstream, without (the equivalent of) Option "SwapbuffersWait" "off".

I don't have that in Xorg.conf and the only patch Ubuntu adds fixes up
the -background none option.

So I would suspect that in this particular driver snapshot vblank is
broken in entirely new way which completely evades whatever the patch
is doing.

Thanks

Michal