Comment 107 for bug 763005
Revision history for this message
| pazuzuthewise (pazuzuthewise) wrote Re: [Bug 763005] Re: Compiz's "Sync to Vblank" makes display stutter/slow with some drivers (like fglrx) | #107 |
Package: compiz
State: installed
Automatically installed: no
Version: 1:0.9.6+
On Wed, Dec 14, 2011 at 5:21 AM, Daniel van Vugt <email address hidden> wrote:
> pazuzuthewise, the slow down is due to new code in ppa:vanvugt/compiz
> that's not related to this fix. So you won't see a slow down when the
> fix appears in oneiric-updates.
>
> Can you please check what version of compiz you're now running? I
> thought I had fixed the slow animation problems in my PPA; compiz
> version 1:0.9.6+
>
> --
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> report.
> https:/
>
> Title:
> Compiz's "Sync to Vblank" makes display stutter/slow with some drivers
> (like fglrx)
>
> Status in Compiz:
> Fix Committed
> Status in Unity:
> Fix Committed
> Status in “compiz” package in Ubuntu:
> Fix Committed
> Status in “fglrx-installer” package in Ubuntu:
> Confirmed
>
> Bug description:
> This bug has been found to affect users of fglrx (ATI/AMD) and Intel
> graphics drivers. NVIDIA users should look to 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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