Cannot get 75hz on TFT monitor

[Alex Deucher]

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

> 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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> > xorg at lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/xorg
> >
>
>
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