intel: lvds-pipe shared with another output?

[Eric Anholt]

On Tue, 2008-05-13 at 17:43 +0200, Simon Pasch wrote:
> Hello,
> 
> We want to use an intel 945gm in a slightly unusual setup here (it's
> for an embedded device):
> Output 1 should be displayed over LVDS and TMDS-1
> Output 2 (right of Output 1) should be displayed over a second
> SDVO-Chip (named Unknown-2 in driver, but seems to work
> out-of-the-box)
> 
> We have successfully used intel-driver 2.3.1 for displaying one single
> output on all screens simultaneously. Displaying two different outputs
> over TMDS-1 and Unknown-2 was successful only if we disabled
> lvds-output first. But we didn't managed to get it working in the
> above mentioned way.
> 
> So the question is:
> Is it possible to share the LVDS-pipe (named "1" by xrandr) with
> another output (for example TMDS-1, which claims to be usable over
> pipe 0 and 1)?
> 
> And, by the way, can LVDS only be used over Pipe 1 because of
> hardware-limitations. or is it only driver-related?  I've seen the
> following code in i830_lvds.c:
> 
>     if (intel_crtc->pipe == 0) {
> 	xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
> 		   "Can't support LVDS on pipe A\n");
> 	return FALSE;
>     }

Both of these are hardware limitations according to the specifications.
Can't do LVDS with any other output on the pipe, and LVDS is only pipe
B.

-- 
Eric Anholt                             anholt at FreeBSD.org
eric at anholt.net                         eric.anholt at intel.com

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