Public bug reported:

Binary package hint: xserver-xorg-video-sis

Since there are several reports on these bugs in xserver-xorg-driver-sis
I give a summary of the reported problems and some of the suggested
solutions. SIS does not provide all required information to make good
drivers for all SIS graphical cards. Hence you might meet problems with
some monitors (resolutions, modes) and you will not get 3D acceleration.

bug 1: The driver sis available in Ubuntu (Karmic) does not function well for 
all SIS graphical cards (e.g. see bugs 523749, 301958, 281454, 291294, etc and 
various questions)
Minor bug 2: In "man sis" the link http://www.winischhofer.AT/linuxsisvga.shtml 
should be replaced by http://www.winischhofer.net/linuxsisvga.shtml


Discussions on internet, especially Ubuntuforums show that many, sometimes 
conflicting, advices are given which seem to work for only part of the users. 
The following advices are given:
- Check http://www.winischhofer.net/linuxsispart1.shtml#12 for supported 
SiS/XGI graphics chips and video bridges.

- Also check what input is used by the monitor. If you have a choice
between analog and digital input you may have to use analog (see tables
on the same link which show that for higher resolutions only analog
works). For that you use a VGA plug (15 pin D-sub). It is found on most
(if not all) machines including laptops for primary VGA output, thus
driven by CRT1. If it is not present you may need a DVI-VGA adapter or
to remove some pins.

- It may be necessary to configure /etc/X11/xorg.conf. If you do not have this 
file you can generate one with Xorg -configure while gdm is not active. Do this 
before installing new drivers and check for modifications after installing new 
drivers. Especially the choice of the driver in the Section Device may be 
important. E.g.:
Section "Device"
         Identifier "devname" # your device
         Driver "sis" # or sisimedia or sis671

- It may be necessary to reduce Shared Memory in the BIOS (see bug
291294 https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-
sis/+bug/291294)

- If needed, download the drivers sisimedia and/or sis671 from
 http://ncc-1701a.homelinux.net/~linux-sis/index.php?page=Downloads (Available 
in Lucid?)

- When you switch monitors it may be needed to completely remove (purge)
one of the sis-drivers and reinstall it and/or to reconfigure xorg.conf
and/or the BIOS (e.g. see bug 523749).

- The sisfb module is mentioned also. E.g.(Bug #264769):
sudo modprobe sisfb
AND
edit your xorg.conf
at:
Section "Device" add there an:
Option "UseFBDev" "true"
Another example: add "video=sisfb" as kernel argument on menu.list and later 
grub.cfg (Bug #530554).
Another example: add sisfb in /etc/modules 

My tip: Before you take any actions read "man sis", visit
http://www.winischhofer.net/linuxsispart1.shtml#12 and
https://help.ubuntu.com/community/Video, and search ubuntuforums and
launchpad with "sis graphics" and the name of your version of Ubuntu to
check your method. Remember that tips may not be valid in your case
because the hardware and software configuration of your pc may not be
equal to that of the tipper.

** Affects: xserver-xorg-video-sis (Ubuntu)
     Importance: Undecided
         Status: New

-- 
Summary of sis graphics bugreports
https://bugs.launchpad.net/bugs/549645
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which is subscribed to xserver-xorg-video-sis in ubuntu.

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