[Intel-gfx] Questions about tripple display

Guo Tang guo.tang at sonoartis.com
Fri Jul 13 18:36:09 CEST 2012

Hi, Daniel,

Thanks for the prompt reply. From your reply looks like I still have a
little hope.

How about if I only run 1024x768 at 60Hz or 30Hz resolution? Will that address
the dotclock problem
between LVDS and TV?


On Fri, Jul 13, 2012 at 9:10 AM, Daniel Vetter <daniel at ffwll.ch> wrote:

> On Fri, Jul 13, 2012 at 5:59 PM, Guo Tang <guo.tang at sonoartis.com> wrote:
> > Hi,
> > Greetings!
> >
> > I have a system with GM 45 chip set. I want to have 3 displays: LVDS,
> VGA,
> > and TV output. There is no need for
> > them to show different contents. So only clone display is required. From
> GM
> > 45 chip set spec, looks like only 2
> > display ports can be active at the same time. Is it possible to modify
> > driver to get 3 clone displays? Any suggestion
> > to where in the driver/Kernel I can poke around would be appreciated.
> This does not work, because both LVDS and TV run on a fixed clock
> (which does not necessarily agree with the dotclock of the mode),
> hence you can't clone them. At least not in all cases, and imo trying
> to support such a configuration in more cases is wasted effort. If you
> need to drive that many outputs, you're not in the market of a low-end
> igd solution like gm45 imho.
> Cheers, Daniel
> --
> Daniel Vetter
> daniel.vetter at ffwll.ch - +41 (0) 79 364 57 48 - http://blog.ffwll.ch
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