I am using Ubuntu 9.10 with a notebook ASUS K50C.
I applied and tried almost every workaround proposed by this topic and some 
other I found in the internet.
Nothing is working, so I am currently using a VESA configuration in xorg.conf, 
of course this means that I am unable to run at 1366x768 resolution and without 
any graphic acceleration.

Section "Device"
        Identifier      "Configured Video Device"
        Driver          "sis671"
EndSection

This is my Xorg.0.log showing errors: http://pastebin.ca/1753595

(EE) SIS(0): **************************************************
(EE) SIS(0):                       ERROR:
(EE) SIS(0): No valid modes found - check VertRefresh/HorizSync
(EE) SIS(0):                   END OF MESSAGE
(EE) SIS(0): **************************************************
(II) UnloadModule: "sis671"
(EE) Screen(s) found, but none have a usable configuration.

Of course I also tried adding some different VertRefresh/HorizSync
values unsuccessfully.

Any help will be greatly appreciated.
TIA

/marco

-- 
[needs-packaging] no working driver for sis 671/771 video cards
https://bugs.launchpad.net/bugs/301958
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