[mythtv-users] Ahh - Evil xorg and modelines

Damian Surr damian at gingermagic.co.uk
Mon Jun 18 12:04:54 UTC 2007


Tom Lichti wrote:
> Damian Surr wrote:
>> Sorry if it looks like I've just posted the same long log file 3 times. 
>> That's not the case. I was responding to 3 different branches of the 
>> thread. I can imagine it being annoying if it doesn't look like that, 
>> but thought it better than starting entirely different threads.
>>   
> I didn't scrutinize them close enough to see if they were the same.
>> To answer your questions, I have a BenQ W100 projector connected to my 
>> computer via a DVI-D to DVI-D cable. The projector is 16/9 and the 
>> native resolution is 854x480
>>
>> My manual indicated that 'supported timing for PC input' includes the 
>> following resolutions .. 640x400 640x480 800x600 1024x768 1280x1024. It 
>> also supports 480i 480p 576i 576p 720i 720p 1080i 1080p
>>   
> I know, I downloaded the W100 manual to see what options there were. 
>> Once I get any other resolution than 800x600 working on this projector, 
>> then I can try a few resolutions to see what looks best. For the moment, 
>> I thought it was best to stick with trying to get 1024x768 (I did try 
>> modelines for all the other resolutions before deciding it was best to 
>> focus on one first).
>>   
> Have you tried a 480p modeline as suggested in the MythTV Wiki:
> 
> 
>       NVIDIA Driver ModePool
> 
> The latest NVIDIA drivers <http://www.nvidia.com/object/unix.html> of 
> both the 9xxx and 8xxx series have a standard ModePool format that can 
> be used to easily create a screen mode without the need of a modeline. 
> For the best results you will want to make sure you have the proper 
> *HorizSync* and *VertRefresh* values in your Monitor subsection.
> 
> The format is simple, 
> /HorizontalResolution/*x*/VerticalResolution/*_*/frequency/
> 
> So the following line in your Screen subsection for your TV,
> 
>     Modes      "1920x1080_60" "1280x720_60" "720x480_60"
> 
> would yield 1080p, 720p and 480p outputs
> 
>     Modes      "1920x1080_60i"
> 
> would yield 1080i output.
> 
> These /*should*/ be compliant for DVI and component output on all TV's 
> so its probably worth trying before playing around with EDID and custom 
> modelines.

Thanks for helping Tom,
Here's a link to the results from that attempt (with log verbose 255)

www.daminator.com/misc/Xorg-log-F.txt


>> As for your question of 'what aspect ratio mode and application mode do 
>> you have the projector set to?' then unless the information above 
>> provides the information I do not know as I don't understand the 
>> question. The projector settings themselves have been left pretty much 
>> at default factory settings.
>>   
> Your projector has settings for aspect ratio mode and application mode. 
> I assumed you had read the manual to see what it can do. It may be that 
> one of those settings is overriding what you are trying to do.

I'll have another look, but I've read the manual cover to cover several
times and nothing stood out. The projector seems to be able to do 480p
and 576i fine via the component cables. I plugged my DVD player in at
the weekend.

I'm starting to question everything. Could it be that resolutions are
limited over DVI-D and I should try a DVD-A cable, or is that just silly?

Damian


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