** Description changed:
[Problem]
Starting around 4/3, when mesa was upgraded from 7.3 to 7.4, several i965
users started noticing X freeze after several hours of use, triggered by
application usage especially noticeable with (but not unique to) compiz enabled.
[Suspects]
Omitting obviously trivial, unrelated changes, here are what changed in
several suspect packages in the timeframe in question:
* intel driver:
4/01: 118_drop_legacy3d.patch: Removed Legacy3D
4/03: 114_fix_xv_with_non_gem.patch: Dropped since it caused regression
4/06: 119_drm_bo_unreference_needs_null.patch: Fixes various nullptr derefs
4/08: 120_fix_vt_switch.patch: Fix nullptr deref in video playback
* xserver:
4/08: 177_animated_cursor_change_master.patch: fixes animated cursors
4/06: 174_set_bg_pixmap_of_cow_to_none.patch: Sets bg pixmap of
composite overlay window to None
3/30: 172_cwgetbackingpicture_nullptr_check.patch: fix race condition
when minimzing/maximizing firefox with flash video playing.
* mesa:
4/03: 7.4 released
* Added MESA_GLX_FORCE_DIRECT env var for Xlib/software driver
* GLSL version 1.20 is returnd by the GL_SHADING_LANGUAGE_VERSION query
* glGetActiveUniform() returned wrong size for some array types
* Fixed some error checking in glUniform()
* Fixed a potential glTexImage('proxy target') segfault
* Fixed bad reference counting for 1D/2D texture arrays
* Fixed VBO + glPush/PopClientAttrib() bug #19835
> * Assorted i965 driver bug fixes
* Fixed a Windows compilation failure in s_triangle.c
* Fixed a GLSL array indexing bug
* Fixes for building on Haiku
* linux:
4/04: 2.6.28-11.41: Revert MCHBAR patch
4/02: 2.6.28-11.40: Add MCHBAR patch
* libdrm:
4/04: 02_libdrm_nouveau_update.patch: Only affects nouveau code
3/29: libdrm-nouveau1.symbols: Probably innocuous
+ [Workarounds]
+ Various people have found one or more of the following have helped to reduce
the frequency or eliminate the freezes:
+
+ * Turn off compiz
+ * AccelMethod UXA
+ * Set NoAccel true
+ * Set Virtual to something high
+ * MigrationHeuristic greedy
+ * Revert to 2.4 -intel driver
+
+ [Current Theory]
+ A 3D memory buffer accumulates data until something gets in there incorrectly
and leads to a freeze. This can happen either slowly over a long period of
light use, or fairly soon if using the system heavily. It is not simply a
matter of filling the memory up, so the trigger often seems to be random, but
usually follows some sort of graphics transition (such as the 3D effect from
alt-tab, or closing a firefox window).
+
+ It is fairly certain that there are multiple freeze bugs present in
+ X.org with the -intel driver. This causes significant confusion when
+ people having different bugs think they might have the same one, and
+ find the symptoms and workarounds don't match. It is also suspected
+ that the same root bug may have multiple different ways of triggering
+ it.
[Original Report]
I am using kubuntu jaunty beta. My system is freezing randomly. I have the
latest updates.
After freezing the mouse pointer still works. And sometimes the power off
button works. On powering off , when the stage for kubuntu logo comes its
showing a distorted image.
This happens with or without desktop effects. These freezes are very
randomly, but mostly when I run some new applications.
I am using intel graphics.
[lspci]
00:00.0 Host bridge [0600]: Intel Corporation Mobile PM965/GM965/GL960 Memory
Controller Hub [8086:2a00] (rev 0c)
Subsystem: Hewlett-Packard Company Device [103c:30be]
00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile
GM965/GL960 Integrated Graphics Controller [8086:2a02] (rev 0c)
Subsystem: Hewlett-Packard Company Device [103c:30be]
--
[i965] X freezes starting on April 3rd
https://bugs.launchpad.net/bugs/359392
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