[Bug 71427] New: Possible HDMI handshake bug when switching between my Linux PC and my Samsung TV

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71427

          Priority: medium
            Bug ID: 71427
          Assignee: chris at chris-wilson.co.uk
           Summary: Possible HDMI handshake bug when switching between my
                    Linux PC and my Samsung TV
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: nbrown398 at yahoo.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: Driver/intel
           Product: xorg

I built a PC using an Intel motherboard, my specs are….

Intel DH77DF Motherboard
Intel G1620 Celeron
2 GB Corsair DDR3-1333
1 TB Western Digital hard drive

My TV is a Samsung LN40C630

This box is running Ubuntu 13.04 on it (but I also tested running OpenELEC
3.2.1 32 bit) on it. This computer is connected to my TV through an HDMI cable
(HDMI port 2 of my TV). Also, my Tivo it connected to my TV through an HDMI
cable (HDMI port 1 of my TV).

THE PROBLEM
When I turn on my HTPC I sometimes leave it on and switch my TV source to my
Tivo so I can watch TV for a while. The problem is that after I’m done watching
my Tivo, when I switch back to my HTPC (HDMI port 2) the screen goes black and
then shows static. This pattern of static and then black repeats every three
seconds or so. It looks like the TV is trying to connect to the HTPC but that
it can’t. This does not always happen, it happens maybe 20% of the time. I can
almost always fix this by switching the TV back to my Tivo (HDMI port 1) and
then back to my HTPC (HDMI port 2) AGAIN. However, this does not always work.
Another tactic is to unplug the HDMI cable coming from the HTPC and plug it
back in. None of these are real solutions though. I did some troubleshooting
and there is what I found…

TROUBLESHOOTING

At first I tried switching HDMI cables.  I tried several cables that I've used
problem-free on my other TVs and the error still occured. Then I tried
different HDMI ports on the TV.  I doubted this was the issue because none of
my TV's HDMI ports have ever given me any issue with any other device. 
However, I tried this anyway and no matter which port I used, the error still
occured.  The motherboard has a DVI port so I tried using a DVI to HDMI adapter
and the error still occurs even through the motherboards DVI port.  I tried
other useless thing such as adjust in sleep timeouts, screensaver settings, etc
etc. and the error still occurs.  Only using a DVI to VGA adapter resulted in
no error occuring.  I also tried switching up my motherboard.  I tried a Asrock
H77M-ITX and an Intel DH61AG and both boards have this error.  I also tried
using different distros of linux (Openelec, Ubuntu, Wattos).  All the linxu
distros had this error.  I tried installing Windows 7 and it worked fine, so
I'm certain this is an issue between my TV and linux.


SUMMARY
So to recap…. The HDMI cables are fine. The HDMI ports on my TV and Motherboard
are fine. The error does not occur when I’m running Windows. The error occurs
when I’m running a Linux distro. Different motherboards showed the same error. 
The error is HDMI/DVI related. I'm guessing this in an xserver or Intel driver
issue. Help!

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