compiz team mailing list archive

[Daniel van Vugt <vanvugt@xxxxxxxxx>]

** Description changed:

  This bug has now been found to affect users of fglrx and intel graphics
  drivers. It could possibly affect nvidia too.
  
- 
  TEST CASE:
  
- Make sure "Sync to Vblank" is enabled in the OpenGL section of
- CompizConfig Settings Manager.
+ 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. They appear  to stutter. The framerate is
- only around 20-30Hz.
+ 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.
- If they don't appear perfectly silky smooth then you are probably
- suffering from this bug. Unless you happen to have a very old machine.
+ 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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packagers, which is subscribed to compiz in Ubuntu.
https://bugs.launchpad.net/bugs/763005

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

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