Open source drivers force vsync for everything 3D - why?

[Not so pretty now]

Why is vsync on for everything and can it be disabled for games?

Using ubuntu 11.04

[curaga]

These are the two toggles, disable both for the best speed.

vblank_mode (vsync)
swapbufferswait (anti-tearing)

[Not so pretty now]

Where and how do I "toggle" them?

[RealNC]

These are the two toggles, disable both for the best speed.

vblank_mode (vsync)
swapbufferswait (anti-tearing)

Hmm, what happens if vblank_mode is disabled and swapbufferswait is enabled? And what's the difference between the two?

[curaga]

@Not so pretty now

"man radeon", "man xorg.conf" for the latter, driconf for the former.

@RealNC

Last I tested that combo, it synced at twice the refresh rate (120fps cap). I don't know the internals, but I think that -wait is a lighter form that only avoids the blank, while vsync has a max cap of refresh rate.


Me <3 editing

[darkbasic]

With swapbufferswait Off sync_vblank doesn't matter anymore and vsync is OFF.
With swapbufferswait On and sync_vblank set to 0 vsync is OFF.
With swapbufferswait On and sync_vblank set to 3 vsync is ON.
You can set sync_vblank on a per-application basis.

At least with Intel.

[Not so pretty now]

"man radeon", "man xorg.conf" for the latter, driconf for the former.

Couldn't you just tell the commands? What is the point of me reading through xorg.conf man page if I only need one concrete thing. I see nothing that could be helpful:

man radeon | grep sync
              XV_VSYNC is used to control whether textured adapter synchronizes the screen update to  the
              XV_CRTC is used to control which display controller (crtc) the  textured  adapter  synchro‐
              nizes  the screen update with when XV_VSYNC is enabled.  The default, 'auto'(-1), will sync
              things  like clone mode where the user can best decide which display should be synced.  The
man xorg.conf | grep sync
              This option controls whether the log is flushed and/or synced to disk after  each  message.
              Possible values are flush or sync.  Unset by default.
       HorizSync  horizsync-range
              gives   the   range(s)   of   horizontal   sync   frequencies  supported  by  the  monitor.
              horizsync-range may be a comma separated list of either discrete values or ranges  of  val‐
              HTimings  hdisp hsyncstart hsyncend htotal
              VTimings  vdisp vsyncstart vsyncend vtotal
                  of  the  VSync  signal.   "Composite" can be used to specify composite sync on hardware
                  used to select the composite sync polarity.
              tal  timings.   These  numbers are the hdisp, hsyncstart, hsyncend, and htotal values.  The
              the  vdisp,  vsyncstart, vsyncend, and vtotal values.  The final section is a list of flags
              select  the  polarity of the VSync signal.  Composite can be used to specify composite sync
              be used to select the composite sync polarity.  The HSkew and VScan options mentioned above
              This option controls whether the video card should drive the sync signal on the green color

You can set sync_vblank on a per-application basis.

How?

[DanL]

Option "SwapbuffersWait" "boolean"

You can set sync_vblank on a per-application basis.

Use driconf and look under performance tab.

[Melcar]

Heh, that's a Linux user for you .
With r300g I have to change both swapbufferswait and sync_vblank for vsync to be turned completely off. For swapbufferswait just add the option to your xorg.conf and set it to off. For sync_vblank use either driconf, although I then had to configure the .drirc file it creates in my home directory and change the "driver" entry to dri2 instead of the r300 it uses (but amusingly enough that doesn't seem to work with Narwhal ).

[darkbasic]

How?

http://dri.freedesktop.org/wiki/Conf...Infrastructure