compiz team mailing list archive

[Daniel van Vugt <vanvugt@xxxxxxxxx>]

If some animations are smooth and it's only dragging windows that is a
problem then bug 773861 is probably a more appropriate place to look.

This bug is about ALL animations stuttering, which is a bug in the fglrx
implementation of "Sync To VBlank". So if you still have issues with
"Sync To Vblank" turned off then you're definitely looking at the wrong
bug.

** Summary changed:

- Compiz's "Sync to Vblank" makes display stutter/slow with some drivers (like fglrx)
+ Compiz's "Sync to Vblank" makes display stutter/slow with fglrx

** Description changed:

** Description changed:

- This bug has been found to affect users of fglrx (ATI/AMD) and Intel
- graphics drivers. NVIDIA users should look to bug 92599 instead.
+ This bug is primarily for users of the fglrx driver, but the proposed
+ fix does improve performance with other drivers. Most NVIDIA users
+ should look at bug 92599 instead.
  
  TEST CASE:
  
  Make sure "Sync To VBlank" is enabled in the OpenGL section of
  CompizConfig Settings Manager. In Ubuntu 11.04 it is enabled by default.
  
  fglrx: Drag some windows around. Also open and close windows. The
  animations will not be smooth as they appear to stutter. The framerate
  is only around 20-30Hz.
  
  intel and possibly any driver: Press WinKey+S or WinKey+W rapidly to
  trigger the expo/workspace animations. These are full-screen animations.
  But are they silky-smooth?
  
  Now turn "Sync To VBlank" off and repeat the above steps again. If you
  notice the animations are much smoother than with "Sync To VBlank" on
  then you are suffering from this bug.
  
  ORIGINAL DESCRIPTION:
  
  Package: fglrx
  Version: 2:8.840-0ubuntu2
  
  01:00.0 VGA compatible controller: ATI Technologies Inc Juniper [Radeon
  HD 5700 Series]
  
  I have ATI's 5770 with fglrx. Having "Sync to Vblank" on makes Unity and
  many Compiz features (Enhanced Zoom, Scale etc.) really slow. Turning
  "Sync to Vblank" off has a huge effect on desktop, responsiveness is
  much, much better. Turning "tearing" off/on from amdccle doesn't seem to
  have any effect on responsiveness.
  
  In Maverick "Sync to Vblank" was off by default, in Natty it's on. This
  will probably have a huge impact on many fglrx users.

-- 
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https://bugs.launchpad.net/bugs/763005

Title:
  Compiz's "Sync to Vblank" makes display stutter/slow with fglrx

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