HDMI problems when using a A/V receiver

HDMI problems when using a A/V receiver

[linux]

Hi

I'm currently using the Intel Core i3 integrated graphics:

[ 68585.994] (II) intel(0): Integrated Graphics Chipset: Intel(R) Clarkdale

I'm running Debian wheezy and I have my system connected via HDMI to my 
flatscreen TV. I'm using a resolution of 1280x720 and everything is 
working fine:

X.Org X Server 1.11.4
Release Date: 2012-01-27
[ 68585.825] X Protocol Version 11, Revision 0
[ 68585.825] Build Operating System: Linux 3.2.0-1-amd64 x86_64 Debian
[ 68585.825] Current Operating System: Linux brian 3.2.0-2-amd64 #1 SMP 
Tue Mar 20 18:36:37 UTC 2012 x86_64
[ 68585.825] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-3.2.0-2-amd64 
root=UUID=94a1038c-931b-4cb0-a0bc-2d38d4aafbdf ro drm.debug=0x0e
[ 68585.825] Build Date: 04 March 2012  11:42:13PM
[ 68585.825] xorg-server 2:1.11.4-1 (Cyril Brulebois <kibi@debian.org>)

I have no special xorg.conf but use the automatically calculated config.

Now I want to put a multimedia receiver (Marantz NR1501) inbetween my pc 
and the TV but I do not get any picture one my tv anymore as soon as the 
i915 driver gets loaded. I tested a lot with different resolutions and 
refresh rates but I do not have success :-(

I also tested with my laptop (also i3 graphics) running Ubuntu 10.04 - 
the same problem: running fine when directly connected to the TV but no 
pictire when the receiver is inbetween. When I run windows on the laptop 
everything is working fine! No matter which resolution/refresh rate I 
use... So I assume it's a problem with the linux driver for i915.

I did a lot of googleing but wihtout success: The only thing I found was 
this blog: 
http://software.intel.com/en-us/blogs/2008/04/22/hdcp-hdmi-repeaters-and-you-well-me-anyway/ 
talking about HDCP problems with windows when repeaters are inbetween 
the pc and the TV (the problem descriptions sounds identically to my 
problem).

My question is: Is it possible that the i915-driver activates HDCP by 
default (by fault)? I was assuming that there is no HDCP under linux...

Or: does anybody have an idea what the problem could be or how I could 
locate it?

Best regards,

Joerg

Re: HDMI problems when using a A/V receiver

[linux]

some minor update:
it looks like as soon as kms get's activated during boot there is no
picture anymore when the A/V-receiver is between PC and TV (or a
projector which I connected for testing but which has the same
behaviour...).
According to OSD of the projector the PC generates 1280x720 (which
sounds correct) and audio via HDMI is also working fine but the image is
just black...
For testing I disabled kms with the effect that the console is working
fine. But X is longer working since the intel x-server requires kms.
When I reload the i915-module with modeset=1 and start X there is no
picture anymore... (again: PC directly connected to TV or projector is
working fine).
Any idea is highly welcome...
Best regards,
Joerg