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Re: 16 bit color for X



> 
> On Fri, 18 Jul 1997, jr wrote:
> 
> > I install Debian 1.3.1 today (i use Red Hat before) and when I start X
> > whitn "startx" all its OK. But when I wnat more color depth, I use 
> > 
> > "startx -- -bpp 16"
> > 
> > but then my screen are flicking and the resolution down very much (much
> > like EGA card)....why? what can i do?
> > 
> > I have an S3 Trio64 and I don't have this problem in RedHat.
> > 
> 
> I suspect that XFree thinks that the modes that need to be used for the
> resolution you want are not supported by your monitor.  If you attach the
> output from the startx command, it could help in diagnosing the problem.
> 
> One thing you could try is to check the XF86Config file you have in Redhat
> and see where it differs from your current one, this will tell you how to
> modify your current version to work with your system.  I suspect that you
> might have the wrong frequencies for the monitor in the current file.

I have mailed earlier to this list what causes this problem and I
believe someone filed it as a bug to the package maintainer.  The video
modes that XF86Setup generates are only the optimal ones for 8 bpp.
This means that it is possible that your video card cannot provide
these optimal frequencies at larger color depth.  A workaround can be
to run XF86Setup again and pretend that your monitor has a lower
maximum vertical refresh rate.  You'll have to experiment a little to
find out how low the frequency should be to get your desired resolution
back.

Eric Meijer

-- 
 E.L. Meijer (tgakem@chem.tue.nl)          | tel. office +31 40 2472189
 Eindhoven Univ. of Technology             | tel. lab.   +31 40 2475032
 Lab. for Catalysis and Inorg. Chem. (TAK) | tel. fax    +31 40 2455054


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