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[Gustavo <gugamilare@xxxxxxxxx>]

Public bug reported:

Binary package hint: xorg

I've seen this problem in this PC for years. Many times Linux works
normally, without problems. Every now and then, depending on the
programs I open, Ubuntu (and other Linuxes I tested) switches into a
"graphic corruption mode": some screen elements are not drawn correctly.

For instance, while navigating with Firefox, after scrolling down on a
webpage, only the lower part of the screen scrolls down, the rest
remains as it is. If you hover the mouse cursor over links or tries to
select text, then appears in the screen some text that was not shown
without selecting. In other words, the webpage scrolls down, but the
display is not updated correctly unless you select text. Unfortunately,
I could not take a screenshot of Firefox with problems because the
screen is updated and no more error is shown, neither in screen nor in
screenshot.

The worst problem seems to be Emacs, screenshot attached. The white
background is not shown, in its place is shown whatever was shown before
selecting the Emacs window, like the desktop or other window's contents.
Most of the times the "graphic corruption mode" is switched on is
because I started Emacs, but not only Emacs causes this. On other
distributions I got that problem very often using yakuake (IIRC it was
Gentoo).

If I switch to terminal (Ctrl + Alt + F1) and change back to desktop,
the "graphic corruption mode" is switched off, and screen mostly show
the correct elements, except for some black or white lines that are
shown occasionally.

To make the situation even worse, sometimes, instead of entering
"graphic corruption mode", the computer freezes. Only the mouse cursor
still moves, nothing else. The programs continue running after the
freeze (I can tell you that for sure) but without input and output all
that is left for me to do in that situation is a hard reset.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: xorg 1:7.5+5ubuntu1
ProcVersionSignature: Ubuntu 2.6.32-23.37-generic 2.6.32.15+drm33.5
Uname: Linux 2.6.32-23-generic i686
Architecture: i386
CurrentDmesg:
 [   22.086128] CPUFREQ: Per core ondemand sysfs interface is deprecated - up_threshold
 [   23.682007] Marking TSC unstable due to cpufreq changes
 [   23.682839] Switching to clocksource acpi_pm
 [   26.980028] eth1: no IPv6 routers present
Date: Wed Jul 14 17:58:44 2010
DkmsStatus: Error: [Errno 2] Arquivo ou diretório não encontrado
GdmLog:
 Error: command ['kdesudo', '--', 'cat', '/var/log/gdm/:0.log'] failed with exit code 1: QInotifyFileSystemWatcherEngine::addPaths: inotify_add_watch failed: No such file or directory
 QFileSystemWatcher: failed to add paths: /home/gugamilare/.config/ibus/bus
 Bus::open: Can not get ibus-daemon's address. 
 IBusInputContext::createInputContext: no connection to ibus-daemon 
 cat: /var/log/gdm/:0.log: No such file or directory
GdmLog1: Error: command ['kdesudo', '--', 'cat', '/var/log/gdm/:0.log.1'] failed with exit code 1: cat: /var/log/gdm/:0.log.1: No such file or directory
GdmLog2: Error: command ['kdesudo', '--', 'cat', '/var/log/gdm/:0.log.2'] failed with exit code 1: cat: /var/log/gdm/:0.log.2: No such file or directory
InstallationMedia: Kubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100427)
Lsusb:
 Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: PCCHIPS M871G
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-23-generic root=UUID=aa7cf55c-3c84-4342-b826-45227699083f ro quiet splash
ProcEnviron:
 LANGUAGE=pt_BR:pt:en
 PATH=(custom, user)
 LANG=pt_BR.UTF-8
 SHELL=/bin/bash
SourcePackage: xorg
dmi.bios.date: 09/15/2005
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 080011
dmi.board.name: M871G
dmi.board.vendor: PCCHIPS
dmi.board.version: 1.0
dmi.chassis.asset.tag: 0123ABC
dmi.chassis.type: 3
dmi.chassis.vendor: PCCHIPS
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr080011:bd09/15/2005:svnPCCHIPS:pnM871G:pvr1.0:rvnPCCHIPS:rnM871G:rvr1.0:cvnPCCHIPS:ct3:cvr1.0:
dmi.product.name: M871G
dmi.product.version: 1.0
dmi.sys.vendor: PCCHIPS
glxinfo: Error: [Errno 2] Arquivo ou diretório não encontrado
system:
 distro:             Ubuntu
 codename:           lucid
 architecture:       i686
 kernel:             2.6.32-23-generic

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 lucid

-- 
Occasional screen corruption with SiS video card
https://bugs.launchpad.net/bugs/605633
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