I experience the same problem as many others with my i855 based Asus M3N 
laptop.  The SXGA+ 1400x1050 natural lcd resolution cannot be set because the 
mode is not available in the BIOS.  There are also difficulties switching 
between lcd, lcd+crt, and crt on the fly.

The second situation is described in this thread:

http://marc.theaimsgroup.com/?l=xfree86&w=2&r=1&s=external+crt+i855&q=b

The first problem with SXGA+ has been discussed a lot with the conclusion that 
nothing can be done without more information from Intel.  I just wanted to 
ask what can be made of the register information from this datasheet.

http://developer.intel.com/design/chipsets/datashts/25261503.pdf

On pages 119-120 there is information about setting the resolution.  Would it 
be possible to disassemble a bios routine and compare it to the datasheet to 
determine how to program the mode?  How hard is this?  Any tips for how to 
try doing this on my Linux system?

Finally, I wonder if maybe Intel would share more information now.  I read a 
recent article about a push for better support of the Centrino wireless chip 
with a binary driver and later an open source driver likely to be released.  
A representative at the LinuxWorld Expo in NY gave me an email contact to 
make a request for better support of i855 graphics.  I didn't ask yet because 
I personally don't have a good understanding what exactly is needed or what 
to do with what they might release.  Anyone have a good suggestion how to 
approach them?

Thanks
-L. Jensen
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