855GM vga out 1680x1050 does not work (i810 driver)

Tero Laitinen tero.laitinen at iki.fi
Mon Nov 6 14:34:21 PST 2006

Colin Guthrie wrote:

>Tero Laitinen wrote:
>>My Xorg's configuration file is at http://www.iki.fi/tol/xorg.conf.txt
>It looks like you picked a default colour depth of 24 bits... In your
>log it only seems to list 1680x1050 at 8, 16 and 32 bit depths..
>Perhaps this is why it's not matching??
>Try changing it to 32 bit in your xorg.conf...

Thank you for the tip. Unfortunately, the screen got no signal again. I 
wish I had a CRT screen I could test with. It would at least show some 
garbage in the screen when misconfigured. This TFT just shows black screen.

The 32 bit mode would not start.  Xorg reported following:

(EE) I810(1): Given depth (32) is not supported by I830 driver

I tried also 16 bit mode but the screen displayed again the message "No 
I noticed that there was no mouse cursor in the embedded lcd screen of 
the laptop, strange.
The log files for both tests are at http://www.iki.fi/tol/xorg16.log.txt 
and http://www.iki.fi/tol/xorg32.log.txt

Another problem showed up which may interest Xorg's developers. After 
restarting Xorg couple of times (two or three) it refused to start again 
and dumped a stack trace:

0: /usr/bin/X11/X(xf86SigHandler+0x84) [0x80c4354]
1: [0xb7f5d420]
2: /usr/bin/X11/X(InitOutput+0x9e4) [0x80a0514]
3: /usr/bin/X11/X(main+0x276) [0x806e486]
4: /lib/tls/libc.so.6(__libc_start_main+0xc8) [0xb7d5dea8]
5: /usr/bin/X11/X(FontFileCompleteXLFD+0xa9) [0x806d9d1]

with a message:

(EE) I810(0): unknown reason for exception

The log file of this startup is at http://www.iki.fi/tol/xorg.error.txt

I posted also a message to 915resolution's discussion group at 
http://groups.google.com/group/915resolution where Stian Skjelstad 
wondered if the modeline was faulty or if VBIOS sets an invalid clock 
settings. I do not know how to check those issues, though.

I have spent the whole day trying to get this screen working but so far 
it has refused to cooperate. The git repository of Intel's drivers is 
still down so I cannot try to play with them. If you come up with any 
other suggestions, I am eager to try. :)

Tero Laitinen

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