[Openchrome-users] not using custom modeline

[Jon Nettleton]

On Tue, 2007-05-01 at 22:50 -0400, David Shay wrote:
> I am using a Via EX10000 with a CX700 with the openchrome experimental
> branch.  I am connecting to a Samsung 204B LCD monitor using the DVI
> port.  There seems to be a known hardware problem with this monitor
> where it flickers on and off when you use it at 1600x1200 at the
> default 60hz frequency.  I tried getting a replacement, but it did the
> same thing.  Some people have had to go through 2 or 3 replacements to
> get a working monitor.  There is another kludgy workaround for this
> problem, which is to reduce the frequency to anywhere between 55 or 56
> mhz.  In any case, I was trying to utilize this workaround by creating
> a new mode in the monitor section called "MyMode1", and then using
> that mode in the Screen section. 
> 
> When I do this, I get an error in Xorg.0.log that "Not using
> "MyMode1" (no mode of this name) ".  I can rename my mode to
> 1600x1200, but then I get the sneaky suspicion that it really isn't
> using that modeline, since it doesn't actually solve my problem,
> that's why I was trying to use a very non-specific name. 

Unfortunately our driver only supports VBE modes with your chipset.  If
you specify your own modeline and it doesn't match a VBE mode you will
get the error you specified above.  I see that VBE reports you have 3
modes for 1600x1200, 120-122-124.  

Instead of creating your own custom modeline I would suggest just
setting your default resolution to be 1600x1200, and limiting the upper
limit for the VertRefresh setting of your Monitor to 56.0 in
xorg.conf.  


I can't guarantee it will work, but it is worth a shot.

Jon
> 
> I'm sure I'm missing something blindingly obvious here....  Attached
> are my xorg.conf and Xorg.0.log.
> 
> Thanks,
> 
> David 
> 
> 
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