[Openchrome-users] panel size mis-detected on Elonex webbook

[Xavier Bachelot]

Alan Bell wrote:
> this is a repost of something I posted a while back, but I am again
> interested in an answer to get it working correctly out of the box
> with Ubuntu Jaunty.
> 
> I have been working on getting Ubuntu Jaunty to work on the Elonex 
> webbook laptop, by default the LCD panel does not work at all but the
>  external VGA port is operational at 1024x768 (which is the native 
> resolution of the monitor I attached). I compiled the latest from
> trunk and installed that, still didn't work, but with with a lot of
> help from schlobinux on IRC I did eventually get it working, it
> required a small fix to let the driver know that a panel was there
> http://www.openchrome.org/trac/changeset/597/trunk and a modeline in
> the xorg.conf to let it know about the 1024x600 resolution of the
> panel This left it with a rather odd stretched screen on the panel,
> it was running at 1024x600 but this was stretched such that the top
> left 820x450 filled the panel. A bit of inspection of Xorg.0.log
> revealed that it thought the native panel size was 1280x800 so what
> it was really doing was stretching the 1024x600 resolution out to fit
> a 1280x800 panel then only displaying 1024x600 of that. The reason it
> thought the native size was 1280x800 was because 
> ViaPanelGetNativeModeFromScratchPad in via_panel.c was getting an
> index of 7, which corresponds to 1280x800 in the array at the top of 
> via_panel.c I hacked line 49 of via_panel.c to read {1024, 600}, and
> recompiled. It then worked perfectly. What is a more sensible way to
> get this to work? clearly my hack would break something else which
> actually does have a 1280x800 panel.

I see 2 other possibilities :
- The value you get from the scratch register is wrong.
- The correspondance table is wrong and your change is actually
fixing the table.

> Is there somewhere I can put the 1024x600 modeline so that my
> xorg.conf can go back to it's almost totally empty state?
> 
> Alan.
> 
Can you post a patch against trunk of your modification, please ?

Regards,
Xavier