low res video mode

glenn gsimpson at mountaincable.net
Mon Oct 30 19:10:44 UTC 2006


Adam Jackson wrote:
> glenn wrote:
> 
>> Adam Jackson wrote:
>>
>>> glenn wrote:
>>>
>>>> I have been hoping someone will solve the video config problem on FC6.
>>>>
>>>> The problem does NOT occur prior to FC6. Since then, it has random 
>>>> started in 800x600x24 mode (a useless mode), or my selected mode 
>>>> (greater than 1024x768x24).  Until this last yum update, the video 
>>>> would randomly choose one of the above modes.  But with this latest 
>>>> update, it will only come up in SVGA (useless mode).
>>>>
>>>> The modes beyond 800x600 are not available so I am shut down, and 
>>>> forced to use this alternate host what is limited to 1024x768.
>>>>
>>>> My host has the following:
>>>>
>>>> AMD 2000+ CPU
>>>> 1 GB of DDR DRAM
>>>> Nvidia 5200 video
>>>> 19 inch KDS monitor
>>>>
>>>> Does anyone know how you can modify the grub command, or the 
>>>> /etc/X11/xorg.conf to select video res that is above 1024?
>>>
>>>
>>>
>>> Your X log will tell you why the modes are being rejected.
>>>
>>> - ajax
>>>
>> Tnxs for the suggestion.  I have compared Xorg.0.log vs 
>> Xorg.0.log.old. In both cases the system has detected I have a CRT 
>> monitor.
>>
>> In the good case, the monitor is detected as a "KDS visual-sensation" 
>> model, while in the alternate case it does not recognize the monitor 
>> and thus assumes it is a generic monitor.  This latter result limits 
>> the res offered to either VGA or SVGA ONLY.
>>
>> This is NOT a problem with any distro prior to FC6.  If I swap hard 
>> drives to an FC5 (or FC4), the monitor is always detected correctly 
>> and the full set of modes are offered.
> 
> 
> I suspect the reason you never saw this prior to FC6 was that your 
> xorg.conf always had sync ranges written out for your monitor, so even 
> when DDC failed it still gave you more or less the range of modes you 
> expected.
> 
> I'm working on caching the DDC info though.
> 
> - ajax
> 
Thank you.

-- 
Glenn Simpson VE3DSP
Hamilton, Ont




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