Bug#614296:
Hi,
I ran into this bug on a fresh install of Debian 8 (Jessie) RC2 on an
EeePC 701 4G with Intel i915GM graphics. Linux kernel 3.16, X.Org
1.16.4, X.Org intel module 2.21.15.
Using acceleration method SNA instead of UXA, as suggested before,
seems to still solve it:
# cat /etc/X11/xorg.conf
Section "Device"
Identifier "Intel Graphics"
Driver "intel"
Option "AccelMethod" "sna"
EndSection
(Said to also give better performance. [1] [2])
Upstream seems to have marked this bug as fixed, not because it was
fixed in UXA, but because they changed the default acceleration method
from UXA to SNA since 2.99.901 [3], and the bug does not show up under
SNA [4]. However, for Debian that change is still in experimental [5]:
> xserver-xorg-video-intel (2:2.99.911+git20140529-1~exp2) experimental; urgency=medium
> ..
> * Stop overriding default upstream acceleration method (i.e. default to SNA
> instead of UXA).
>
> -- Vincent Cheng <vcheng@debian.org> Mon, 02 Jun 2014 23:47:23 -0700
It seems Jessie will ship with version 2.21.15, using UXA as default.
Considering that this issue was never really fixed in UXA in the four
years that it was open upstream, and that a change to SNA is unlikely
to be allowed into an (upcoming) stable release, I guess this bug will
probably remain unresolved for Jessie... Right?
Regards,
Peter
[1] http://cynic.cc/blog/posts/sna_acceleration_vs_uxa/
[2] https://wiki.debian.org/DebianEeePC/HowTo/Configure
[3] http://www.phoronix.com/scan.php?page=news_item&px=MTQ1MzU
[4] https://bugs.freedesktop.org/show_bug.cgi?id=36326#c98
[5] http://metadata.ftp-master.debian.org/changelogs//main/x/xserver-xorg-video-intel/experimental_changelog
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