[CentOS] Problem with widescreen display

Rainer Duffner rainer at ultra-secure.de
Mon Nov 3 09:56:17 UTC 2008


Marko Vojinovic schrieb:
> On Sunday 02 November 2008 12:26, William L. Maltby wrote:
>   
>> On Sat, 2008-11-01 at 22:08 +0000, Marko Vojinovic wrote:
>>     
>>> Basically, what I did was to run system-config-display to reconfigure for
>>> the new monitor and resolution. All goes well, but after X restarts, I
>>> see a strange picture: the resolution indeed goes to 1680x1050 as is
>>> supposed to, but is squeezed/shrinked/scaled horizontally to match a 4:3
>>> aspect ratio, leaving two (unequal) black bands on the left and right
>>> side of the monitor.
>>>       
>> This sounds like the "Modes" line in the "Subsection Display" may not
>> have the right settings. The manual/CD for the monitor should have the
>> right settings. I would compare those against what the configuration
>> process generated and manually edit if needed. Why the difference
>> between FC4 and CentOS, I can't guess.
>>     
>
> Comparing the CentOS and Fedora Xorg.0.log I found that the actual modelines 
> are just slightly different. Assuming that this difference might actually be 
> important, I took the known-to-work modeline from Fedora's Xorg.0.log, 
> copy-paste it in CentOS xorg.conf and forcing X to use that. But the result 
> is the same.
>   

I only run CentOS on servers, but when I got my widescreen monitor at
work, I couldn't get the full resolution with the X that came with
OpenSuSE 10.3.
Only OpenSuSE 11 works.
Too bad that printing doesn't work in OpenSuSE 11 anymore....
My take: the X-server makes some assumptions that are not true for
widescreen hardware and throws away the modelines it gets (because it
thinks they won't work). Seems to have been fixed with later X releases
(or patches).
For desktop-use, there's little alternative to Ubuntu/OpenSuSE/Fedora
and re-installing every couple of months (and living with new and
surprising bugs every release).




Rainer



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