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

Larry T larryt at
Tue Sep 9 19:24:44 PDT 2008

I guess #1 is not supported in the Intel drivers. I have not found any
combination that seems to get it working. It looks like it is almost there
but not quite. I was able to get #2 working with some help. The solution was
to compile the latest from git and run that.

Unfortunately, I have not been able to get my ideal resolution to load. What
troubles me most is that I had it working and then I rebooted and I lost it.
The modeline I generated by gtf and used is:
Modeline "1360x768_60.00"  84.72  1360 1424 1568 1776  768 769 772 795
-HSync +Vsync
HorizSync    30.0 - 48.0
VertRefresh  50.0 - 75.0

As near as I can tell, it is generating the picture shifted about half to
the left of the screen. The rest is not being drawn and is populated with
whatever last filled the buffer on the TV. Here is a camera photo of the
It appears to be outputting my proper resolution for the left side of the
screen. Everything on the right side is what is remaining in the TV's
buffer. For example if I turn on my cable box and then switch back to the
PC, it will display fragments of the last output from the cable box.

I have also confirmed that this is problem remains whether I use the TV
directly or the receiver between the PC and TV. Is this indicative of a
horizontal sync problem? Are there any magic xorg.conf options that would
quickly correct this?

Thanks again.

On Fri, Sep 5, 2008 at 6:01 AM, Larry T <larryt at> wrote:

> 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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