Xorg and specific signal PC

Revolver Onslaught revolver.onslaught at gmail.com
Tue Dec 9 04:23:53 PST 2008

On Tue, Dec 9, 2008 at 1:19 PM, Beso <givemesugarr at gmail.com> wrote:
> 2008/12/9 Revolver Onslaught <revolver.onslaught at gmail.com>:
>> Hello,
>> I recently purchased an FullHD 100Hz TV (Samsung LE40F86BDX) and a
>> Nvidia GeForce9500 with HDMI output.
>> This way, I can link my Linux on my TV.
>> However, I cannot switch to 100Hz when the PC is linked to the TV
>> (HDMI or VGA). I supposed it was a security but I was wrong : any of
>> the 1080p FullHD source (Bluray, Xbox 360, etc) I use can be viewed in
>> 100Hz even connected via HDMI. In the TV manual, it is wrote that it's
>> the behaviour when PC is connected...
> what behavior?! does the manual indicate that the 100hz mode isn't available
> when connected to the pc output?


>> So, I deduce that my Nvidia card send a specific signal, like RVB does
>> (I suppose other cards have the same behaviour). This signal is then
>> "catched" by the TV and the 100Hz mode is no more available.
> have you tried connectig to the dvi or a dvi-hdmi converter and then
> connect it to
> the tv?!

Not yet. I only tried HDMI and VGA.

>> Is there any way to switch off this signal with Xorg even with a patch ?
>> Many thanks,
>> RO
> if you're sure that the mode is supported you chould force it in your
> settings (nvidia control panel or xorg.conf).
> beware: if you force a mode that your tv doesn't support when
> connected to the pc then you'll most likely
> burn the tv and/or the videoboard.

I don't think it's the right way. The TV computes the intermediates
pictures in 100Hz mode. For example, when I read a DVD with my
DVDplayer, the refresh rate is 50Hz (or 60) and the TV computes the
pictures to render 100pic/sec.

Thanks for your help

> --
> dott. ing. beso

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