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[Simon Bridge <663788@xxxxxxxxxxxxxxxxxx>]

Confirmed for me too - old intel card machines seem to be affected.
There is speculation that this may be related to changes which disable DRI for older intel cards, sacrificing 3D accel in favor of reliable KMS. It would be helpful to have this verified: has Ubuntu 10.10 been set up so that 3D accel is disabled for some intel cards?

I have a discussion going at:
http://www.linuxquestions.org/questions/ubuntu-63/desktop-effects-gone-after-upgrade-to-maverick-845421/

more detailed info. for my setup.

$ lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation 82852/855GM Integrated Graphics Device (rev 02)

Used to have desktop effects (10.04), now I don't (10.10) - upgraded,
via update manager, yesterday (see date).

Checked - chipset is not on compiz blacklist. Is using i915 driver...

$ lsmod | grep video
video 18712 1 i915
output 1883 1 video

$ lsmod | grep i915
i915 291004 2 
drm_kms_helper 30200 1 i915
drm 168054 2 i915,drm_kms_helper
intel_agp 26360 2 i915
i2c_algo_bit 5168 1 i915
video 18712 1 i915

$ dmesg | grep drm
[ 24.373104] [drm] Initialized drm 1.1.0 20060810
[ 24.627127] [drm] set up 7M of stolen space
[ 25.100789] [drm] initialized overlay support
[ 26.545217] fb0: inteldrmfb frame buffer device
[ 26.545219] drm: registered panic notifier
[ 26.545500] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0

$ grep -i "Direct rendering" /var/log/Xorg.0.log
-- does not return anything

$ grep -i DRI /var/log/Xorg.0.log

[ 28.314] (II) FBDEV(0): Creating default Display subsection in Screen section
"Default Screen Section" for depth/fbbpp 24/32
[ 28.620] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
...... lots and lots of this - followed by:
[ 28.626] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[ 28.626] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[ 28.653] (II) AIGLX: Screen 0 is not DRI2 capable
[ 28.653] (II) AIGLX: Screen 0 is not DRI capable


Clean install to identical HW also has same results: ergo - not an upgrade issue. It looks like Ubuntu is now set up to do this - reinforcing speculation about recent changes.

-- 
"Extra" visual effects are reverted to "none" at random or when going into compiz settings manager
https://bugs.launchpad.net/bugs/663788
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