[ltp] DVI problem again

[Dragos Vingarzan]

You are right Alex.
Found at http://www.ati.com/products/radeon7500/radeon7500/faq.html this:

 What is the speed of the TMDS transmitter for driving a DVI-I based 
digital flat panel monitor and what is the maximum resolution?     
A20:     Radeon® 7500 supports a 165MHz TMDS transmitter and can reach 
resolutions of up to 1600x1200. DVI resolution and refresh support is 
dependant upon DDC signals from the monitor. Some resolution and refresh 
rate restrictions may occur depending upon the signals sent from the 
monitor.

So the chip can do it, no doubt.Also here it says that it can do  LVDS + 
DVI + CRT in parallel:  
http://www.ati.com/products/embedded/mobilityradeon750032/features.html

But then, if it works, why would IBM lock it from the windows drivers? 
This is my main argument that it is a hardware limitation.

It smells like a strategic decision so that the 7500 won't compete with 
the higher models in desktop usage... I, for one, don't feel the 
performance difference from M7 to M24 in eclipse, but I surely needed 
the higher resolution and I switched.

-Dragos-

Alex Deucher wrote:

>On 11/17/05, Dragos Vingarzan <vingarzan@fokus.fraunhofer.de> wrote:
>  
>
>> From my T42 with the 7500 and trying with different hi-res LCDs:
>>1. The DVI can't drive displays with a res >1280x1024.
>>2. The DVI and LCD do not work in parallel - maybe it's the same
>>circuit, because I could never turn them both on.
>>
>>As with the windows drivers it's the same, I think those are limitation
>>of the 7500...
>>
>>With the T43p and the V3200 (M24) it is quite easy to go over both problems.
>>
>>    
>>
>
>It's definitely not a limitation of the chip (the display cells on the
>radeons have been roughly the same since the r128 days), however, how
>IBM wired it up is another matter...
>
>Alex
>
>  
>
>>Cheers,
>>Dragos
>>
>>Martin Höfling wrote:
>>
>>    
>>
>>>I still could not solve the following problem: Samsung 20'' 1600x1200
>>>connected to the DVI port of my dock. Radeon 7500 Mobility in a T40 (radeon
>>>driver):
>>>
>>>-Analog 1600x1200 is working flawless (Windows & Linux)
>>>-DVI hangs (linux) or shows 1280x1024(Windows) 1600x1200 only scrolling (I
>>>assume it's the IBM-Windows software encoded limitation)
>>>-I tried to add modelines to my monitorsection, both are working in analog
>>>mode with 60Hz output
>>>       Modeline        "1600x1200" 162.00 1600 1664 1856 2160   1200 1201
>>>1204 1250
>>>       Modeline        "1024x768"  60.80  1024 1056 1128 1272   768  768  770
>>>796
>>>
>>>-another question which has nothing to do with the problem: xrandr rotation is
>>>not working
>>>
>>>I provided some (hopefully useful) information, thanks for help.
>>>      Martin
>>>
>>>martin@arrakis ~ $ xrandr -q
>>>SZ:    Pixels          Physical       Refresh
>>>0   1024 x 768    ( 411mm x 311mm )   0
>>>*1   1600 x 1200   ( 411mm x 311mm )  *0
>>>Current rotation - normal
>>>Current reflection - none
>>>Rotations possible - normal
>>>Reflections possible - none
>>>
>>>martin@arrakis ~ $ X -version
>>>
>>>X Window System Version 6.8.2
>>>Release Date: 9 February 2005
>>>X Protocol Version 11, Revision 0, Release 6.8.2
>>>Build Operating System: Linux 2.6.12 i686 [ELF]
>>>Current Operating System: Linux arrakis 2.6.14.1 #1 PREEMPT Sun Nov 13
>>>20:44:34 CET 2005 i686
>>>Build Date: 19 September 2005
>>>       Before reporting problems, check http://wiki.X.Org
>>>       to make sure that you have the latest version.
>>>Module Loader present
>>>
>>>xorg.conf is attached.
>>>
>>>
>>>
>>>      
>>>
>>--
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>>
>>    
>>