Cannot get 75hz on TFT monitor (via DVI)

[Erik Ahlner]

Alex Deucher wrote:

>On 10/31/05, Björn Nilsson <bni.swe at gmail.com> wrote:
>  
>
>>I have a ViewSonic VP171S TFT monitor, and radeon 9200SE, and I get about
>>the same results as you. xvidtune doesnt lie to me though, it reports 60 Hz.
>>OSD reports 60Hz. In Windows XP I can use 75Hz if I want (I think its
>>default), but I have not noticed any difference in display quality either
>>way. I have not tried with VGA cable like you.
>>
>>    
>>
>
>IIRC, the radeon driver rejects user specified modelines for DVI.
>
>Alex
>  
>

Could this be the case for the Nvidia drivers too? (both nv and nvidia)

Erik

>  
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>>On 10/31/05, Erik Ahlner <whyz at home.se> wrote:
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>>>Michel Dänzer wrote:
>>>
>>>      
>>>
>>>>On Fri, 2005-10-28 at 17:26 +0200, Erik Ahlner wrote:
>>>>
>>>>
>>>>        
>>>>
>>>>>I switched to nv driver instead of nvidia just to be certain that it
>>>>>wasn't the drivers fault, but that made no difference. I still got 60hz.
>>>>>
>>>>>BUT:
>>>>>My monitor has 2 inputs,one DVI and one VGA. So does the gfx.
>>>>>I switched to VGA cable, which instantly (without changing any settings
>>>>>at all) gave me 75hz!
>>>>>So, there's something jiffy about DVI.. it works in 75hz in windows, but
>>>>>in Xorg, it just gives me 60.
>>>>>
>>>>>
>>>>>          
>>>>>
>>>>The panel probably runs at 60 Hz anyway, so that should be ideal.
>>>>
>>>>
>>>>
>>>>
>>>>        
>>>>
>>>No, it does *not* run at 60hz. There's a VERY noticable difference
>>>between the two. Easy way to check:
>>>60hz (DVI) gives me tearing when running the game at maxfps 60 (because
>>>fps rate similar to refresh rate tends to give tearing). I only need to
>>>adjust it a few hz from 60 and it is smooth.
>>>75hz (VGA only atm :(() looks good at maxfps 77, which is the only fps
>>>rate i can use to maintain the physics of the game (yeah, i know it's
>>>stupid). Plus: the On Screen Display menu of the monitor tells me what
>>>the refresh rate is, as I earlier posted:
>>>      
>>>
>>http://whyz.mine.nu/imgp6252.jpg
>>    
>>
>>>Anyway, this is not the question whether it's sufficient for me or not,
>>>it's a serious BUG imo. The monitor handles 75hz (According to specs,
>>>which also has been successfully used in Windows via DVI and in Linux
>>>only via VGA), but Xorg refuses to deliver 75hz via DVI!
>>>With no changes whatsoever to xorg.conf, just switching from DVI
>>>output&input to VGA output&input, I get 75Hz.
>>>
>>>So, is there ANYONE that has successfully used more than 60hz via DVI
>>>using xorg in this list? Am i the only one that thinks it's weird?
>>>
>>>Kind regards,
>>>Erik Ahlner
>>>
>>>
>>>_______________________________________________
>>>xorg mailing list
>>>xorg at lists.freedesktop.org
>>>http://lists.freedesktop.org/mailman/listinfo/xorg
>>>
>>>      
>>>
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>>
>>    
>>
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