Public bug reported:
Binary package hint: xserver-xorg-video-intel
Distributor ID: Ubuntu
Description: Ubuntu jaunty (development branch)
Release: 9.04
Codename: jaunty
Updates current as of 2009-03-15 14:30 PDT
Several bugs have been observed. This has been tested with both the current
release and the PPA xorg-edgers packages:
These bugs crop up when DRI2 and UXA are ON.
They all still occur when UXA is on but DRI2 is not.
They ALL go away when EXA is used, EXA seems to remain completely stable.
1) Every 30 seconds to 3 minutes, the screen flickers, and usually recovers.
2) Eventually the screen will go blank but not turn off (a black screen). This
is irrecoverable, even with a restart of X, X will start with a blank screen.
The system must be rebooted to be able to use X again. Restarting X, up to
and including removing the i915 and drm modules from the kernel, do not recover
the display hardware. X still responds to keyboard and mouse events in this
state, there is simply no display.
3) 3D applications can freeze X. Typically the mouse still works but the
display (excepting the mouse) stops updating, including the clock.
4) When switching to a text console (ctrl-alt-F1) and then returning to the X
server (alt-f7), the return to the X server will fail, with the same blank
screen as in (2). X is effectively lost. However restarting X still works in
this situation, unlike in (2) which requires a reboot.
5) Significantly lower performance in GL applications: Both Second Life and
glxgears experience a loss of performance in UXA/DRI2 of about 50%. HOWEVER 2D
performance in UXA/DRI2 seems to be about twice as fast.
These bugs were experienced in BOTH of the versions listed below and may
stem to related xorg packages. In both testing scenarios, the packages
from both the official development branch, and the PPA xorg-edgers, were
all used together (anotherwords all of the non-PPA packages, then using
all of the provided PPA packages). No observable difference was
detected.
xserver-xorg-video-intel:
Installed: 2:2.6.99.1+git20090312.dc3ff0b5-0ubuntu0tormod
Candidate: 2:2.6.99.1+git20090312.dc3ff0b5-0ubuntu0tormod
Version table:
*** 2:2.6.99.1+git20090312.dc3ff0b5-0ubuntu0tormod 0
500 http://ppa.launchpad.net jaunty/main Packages
100 /var/lib/dpkg/status
2:2.6.1-1ubuntu4 0
500 http://us.archive.ubuntu.com jaunty/main Packages
I am currently using the xorg-edgers packages in EXA/DRI1 mode, as they
are as stable as what is in the main repository from all appearances.
The system is an Acer Aspire One ZG5. A dump of lspci -vv and
Xorg.0.log is attached.
** Affects: xserver-xorg-video-intel (Ubuntu)
Importance: Undecided
Status: New
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Jaunty DRI2/UXA/GEM
https://bugs.launchpad.net/bugs/343362
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