Cannot get 75hz on TFT monitor

[Björn Nilsson]

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.

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
>
>
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