Intel: Starting X on HDMI with no display/Onkyo Receiver

[Larry T]

I am trying to set up a Shuttle SG33G5 using onboard video on Fedora Core 9.
It uses the following Intel graphics processor:
(lspci) Intel Corporation 82G33/G31 Express Integrated Graphics Controller
(rev 02)
(xorg log) (II) intel(0): Integrated Graphics Chipset: Intel(R) G33

1) I seem unable to make X start without a connection present (with the
receiver powered off vs no cable plugged in appears to be functionally
equivalent cases). In my nvidia system, I could force it with a
ConnectedMonitor line in my xorg.conf. I seem to be able to get to a similar
point but the resulting xorg.conf messages indicate no modes despite
specifying them in the xorg.conf:
(II) intel(0): Output TMDS-1 enabled by config file
(WW) intel(0): Unable to find initial modes
(EE) intel(0): Output TMDS-1 enabled but has no modes
(EE) intel(0): No valid modes.
...
(EE) Screen(s) found, but none have a usable configuration.

Is there any way to force X to come up with a mode even if no connection is
present with the intel drivers?

2) I am trying to connect it to an Onkyo 805 receiver via HDMI. The display
passes through fine in the BIOS and Linux text mode. However, as soon as X
takes control, the receiver reports no signal. If I move the HDMI plug
directly to my TV at this point, I see the display. From the xorg.conf
messages, everything appears to be functional. Has anybody made this
connection work? As a point of reference, I have other HDMI inputs to the
same receiver that work including an Nvidia graphics based Linux system so I
think the receiver hardware and Linux-based computers in general are
absolved.

Thanks for any help,
LT
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