RESOLVED: Cannot get 75hz on TFT monitor (via DVI)

[Erik Ahlner]

Hi everyone!

/me is a happy panda now

Sorry for accusing xorg to have a bug; it seems like the nvidia drivers 
could need some more documentation.

I desperately searched for the word DVI in the nvidia readme, and found 
an option called
Option "ExactModeTimingsDVI" "boolean":
/Forces the initialization of the X server with the exact timings
    specified in the ModeLine. Default: For DVI devices, the X server
    inilializes with the closest mode in the EDID list.
/
I didnt think this would matter, as 75hz would be the closest mode imho.
Anyway, with this turned on, i got my precious 75hz after all. :)

Thanks for your help all!

cheers,
Erik Ahlner

Alex Deucher wrote:

>On 10/31/05, Erik Ahlner <whyz at home.se> wrote:
>  
>
>>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)
>>
>>    
>>
>
>I don't know.  I'm not even sure the nv driver really officially fully
>supports DVI.
>
>Alex
>
>  
>
>>Erik
>>
>>    
>>
>>>      
>>>
>>>>On 10/31/05, Erik Ahlner <whyz at home.se> wrote:
>>>>
>>>>
>>>>        
>>>>
>>>>>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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>>>
>>>
>>>
>>>      
>>>
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>>    
>>
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