windows flicker on click to switch

[Allison Karlitskaya]

i just installed the gutsy beta on my 1st generation macbook

these machines have intel graphics (945gm)

i'm running a more or less stock install. i think this means that i have the modesetting driver installed.

when i click the mouse to switch between overlapping windows there is flickering.

basically, say you have two normal windows A and B with B currently overlapping A.

you click on A to switch to it. near as i can tell, this is the very quick sequence of events:

  - A raises over top of B
  - A disappears completely
    - on the overlap parts you briefly see B again
    - on the non-overlap parts you briefly see the background image
  - A reappears

this all happens very quickly -- maybe over the course of a quarter of a second. it's definitely long enough to always be perceptable, though. it happens 100% of the time.

[David Portwood (dzportwood)]

It could be your graphics driver isnt providing 3d hardware acceleration, issuing the command 'glxinfo | grep direct' in a terminal will reveal this.
Thanks,
David P.

[David Portwood (dzportwood)]

Sorry I also need the output of the command 'cat /etc/X11/xorg.conf | grep Driver' to determine which video driver you are using.

[Allison Karlitskaya (desrt)]

i'm using the default intel driver as shipped with gutsy

desrt@swansea:~$ glxinfo | grep ^dir
direct rendering: Yes

desrt@swansea:~$ grep -A10 'Section "Device"' /etc/X11/xorg.conf | grep Driver
        Driver "intel"

desrt@swansea:~$ dpkg -S /usr/lib/xorg/modules/drivers/intel_drv.so
xserver-xorg-video-intel: /usr/lib/xorg/modules/drivers/intel_drv.so

[Allison Karlitskaya (desrt)]

some more information: i tried this with the live cd. i can reproduce by doing the following:

  - boot gutsy beta live cd in my macbook
  - open two terminal windows
  - switch between them.

the flickering occurs when switching by mouse click or by using the taskbar. alt+tab is perfectly smooth (probably the additional effects here prevent the problem)

[David Portwood (dzportwood)]

Compiz package is not from the official Ubuntu repositories, and as such is not supported here. Please report this bug upstream at https://bugs.freedesktop.org/enter_bug.cgi?product=xorg . Thanks!

[Allison Karlitskaya (desrt)]

i might be wrong to reopen this bug, but i ask you to confirm your last statement: is the ubuntu live cd really unsupported by ubuntu?

[David Portwood (dzportwood)]

I closed the wrong set of bugs, sorry.

[Allison Karlitskaya (desrt)]

disabling the "fading windows" plugin in ccsm fixes the problem.

upon reenabling it, the problem remains fixed.

travis thinks that this is a problem with the order in which the plugins are loaded.

[will_in_wi (will-in-wi)]

I confirm that the above comment works.

[Sebastian Heinlein (glatzor)]

Furthermore the shadow of the newly focused window gets extendend for a small period of time. this looks strange.

[Chris (cmavr8)]

Disabling "fading windows" does not work for me...
Need to disable compiz to get a 3D app running ok..