Intel 855GM with 1400x1050 works
good news for all of you who work with a Laptop that uses the graphics
chip mentioned above and were not able to switch to a resolution of
1400x1050, for example on an Acer Travelmate 661LMi. Alain Poirier
developed a C program that is able to change the provided BIOS
resolutions. The problem is that Acer did not patch the BIOS to provide
the right resolution for their displays, instead they put some
resolutions in it, that make no sense, like
Mode 3c : 1920x1440, 8 bits/pixel
The program is able to replace a resolution with another one by patching
the RAM version of the video bios.
You can find the software here: http://perso.wanadoo.fr/apoirier/
On the Acer TM 661LMi we had to change one line in the C file on line
34: "*bios_type = -1;" -> "*bios_type = 0;"
Then you compile the file (make) and install it as root (make install).
Now you can change the resolution by executing
855resolution 3c 1400 1050
and restarting the X server. This will change the resolution only for
this boot session, so make sure to mention the program in a startup
script if you want to have this thing work after reboot.