I got the same kernel panic described as above. The kdm.log file reports
"(EE) intel(0): underrun on pipe B!":
********************************************************************************
Note that your system uses syslog. All of kdm's internally generated messages
(i.e., not from libraries and external programs/scripts it uses) go to the
daemon.* syslog facility; check your syslog configuration to find out to which
file(s) it is logged. PAM logs messages related to authentication to authpriv.*.
********************************************************************************
X.Org X Server 1.5.2
Release Date: 10 October 2008
X Protocol Version 11, Revision 0
Build Operating System: Linux 2.6.24-19-server i686 Ubuntu
Current Operating System: Linux ubuntu 2.6.27-11-generic #1 SMP Thu Jan 15
11:03:58 UTC 2009 i686
Build Date: 24 October 2008 08:00:16AM
xorg-server 2:1.5.2-2ubuntu3 (bui...@rothera.buildd)
Before reporting problems, check http://wiki.x.org
to make sure that you have the latest version.
Module Loader present
Markers: (--) probed, (**) from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Tue Jan 20 13:55:50 2009
(==) Using config file: "/etc/X11/xorg.conf"
The XKEYBOARD keymap compiler (xkbcomp) reports:
> Warning: Type "ONE_LEVEL" has 1 levels, but <RALT> has 2 symbols
> Ignoring extra symbols
Errors from xkbcomp are not fatal to the X server
The XKEYBOARD keymap compiler (xkbcomp) reports:
> Warning: Type "ONE_LEVEL" has 1 levels, but <RALT> has 2 symbols
> Ignoring extra symbols
Errors from xkbcomp are not fatal to the X server
kdmgreet(5686) KLocalePrivate::initEncoding: Cannot resolve system encoding,
defaulting to ISO 8859-1.
(EE) intel(0): underrun on pipe B!
X.Org X Server 1.5.2
Release Date: 10 October 2008
X Protocol Version 11, Revision 0
Build Operating System: Linux 2.6.24-19-server i686 Ubuntu
Current Operating System: Linux ubuntu 2.6.27-11-generic #1 SMP Thu Jan 15
11:03:58 UTC 2009 i686
Build Date: 24 October 2008 08:00:16AM
xorg-server 2:1.5.2-2ubuntu3 (bui...@rothera.buildd)
Before reporting problems, check http://wiki.x.org
to make sure that you have the latest version.
Module Loader present
Markers: (--) probed, (**) from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Tue Jan 20 14:06:54 2009
(==) Using config file: "/etc/X11/xorg.conf"
The XKEYBOARD keymap compiler (xkbcomp) reports:
> Warning: Type "ONE_LEVEL" has 1 levels, but <RALT> has 2 symbols
> Ignoring extra symbols
Errors from xkbcomp are not fatal to the X server
The XKEYBOARD keymap compiler (xkbcomp) reports:
> Warning: Type "ONE_LEVEL" has 1 levels, but <RALT> has 2 symbols
> Ignoring extra symbols
Errors from xkbcomp are not fatal to the X server
kdmgreet(5858) KLocalePrivate::initEncoding: Cannot resolve system encoding,
defaulting to ISO 8859-1.
X.Org X Server 1.5.2
Release Date: 10 October 2008
X Protocol Version 11, Revision 0
Build Operating System: Linux 2.6.24-19-server i686 Ubuntu
Current Operating System: Linux ubuntu 2.6.27-11-generic #1 SMP Thu Jan 15
11:03:58 UTC 2009 i686
Build Date: 24 October 2008 08:00:16AM
xorg-server 2:1.5.2-2ubuntu3 (bui...@rothera.buildd)
Before reporting problems, check http://wiki.x.org
to make sure that you have the latest version.
Module Loader present
Markers: (--) probed, (**) from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Tue Jan 20 14:16:11 2009
(==) Using config file: "/etc/X11/xorg.conf"
The XKEYBOARD keymap compiler (xkbcomp) reports:
> Warning: Type "ONE_LEVEL" has 1 levels, but <RALT> has 2 symbols
> Ignoring extra symbols
Errors from xkbcomp are not fatal to the X server
The XKEYBOARD keymap compiler (xkbcomp) reports:
> Warning: Type "ONE_LEVEL" has 1 levels, but <RALT> has 2 symbols
> Ignoring extra symbols
Errors from xkbcomp are not fatal to the X server
kdmgreet(5579) KLocalePrivate::initEncoding: Cannot resolve system encoding,
defaulting to ISO 8859-1.
(EE) intel(0): underrun on pipe B!
Please, give us any advice for troubleshooting and finding out what may be
causing that: a system that freezes 50% times is nearly unusable!
Thank you for your time and consideration.
--
[i965] Xorg lockup
https://bugs.launchpad.net/bugs/312270
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