[Bug 42035] no way to turn off vsync

[Michal Suchanek]

2011/10/24 Michel Dänzer <michel at daenzer.net>:
> On Don, 2011-10-20 at 12:16 +0200, Michal Suchanek wrote:
>>
>> On 20 October 2011 11:38,  <bugzilla-daemon at freedesktop.org> wrote:
>> > https://bugs.freedesktop.org/show_bug.cgi?id=42035
>> >
>> > --- Comment #1 from Michel Dänzer <michel at daenzer.net> 2011-10-20 02:38:29 PDT ---
>> >> This should be runtime configurable, preferably per-application like dri.
>> >
>> > That would require some xserver dri2 changes first, to allow the driver to tell
>> > the different cases apart. There's been some discussion about this on the
>> > xorg-devel list, started by Chris Wilson.
>>
>> Anyone can point at the discussion or say what the problem is with this?
>
> Actually, the radeon driver patch below might be good enough, at least
> for now. It disables Option "SwapBuffersWait" by default when the real
> sync-to-vblank functionality is working. There should be no need for the
> vline waits for DRI2 in that case.
>
> Thoughts

Is it possible to determine if the option is on or off?

Or does it produce some log messages saying what it enables based on what?

It is very hard to debug issues with options that are set
automatically depending on some other option being present or the
state of the weather when the X server started.

Thanks

Michal