I have been running the 2d sis67x linux driver at 1360x768 for awhile now, and it appears to be stable.
I have been receiving a lot of requests to provide the driver & src code, so I am uploading them to the following location (available by end of today!):
It should be noted that the driver was specifically changed to support ASUS X5DC Laptop with 1360x768 resolution....although it may work with others (I can't confirm that!) - but would be happy to here from users that get it running ok.
I have included a copy of my xorg.conf file that shows you the options set on my ASUS X5DC.
if thoses that require instructions on how to install the 64-bit binary you need to :
tar xjf Asusx5dc-ubuntu910-sis671-64bit.tar.bz2
then copy the files (sis671_drv.la , sis671_drv.lai , sis671_drv.so) to /usr/lib/xorg/modules/drivers
modify/create new /etc/X11/xorg.conf file & restart X.
NOTE: I haven't had a chance to modify the driver to read EDID from file, but to be honest...it looks a bit like a non-runner because the EDID information is incorrect anyway. I am going to look at creating an option in the sis driver to override the EDID information for special cases (when I get time!)