[Bug 100885] New: Blank screen after cycling HDMI receiver input

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100885

            Bug ID: 100885
           Summary: Blank screen after cycling HDMI receiver input
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: matt at matthoran.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 131151
  --> https://bugs.freedesktop.org/attachment.cgi?id=131151&action=edit
dmesg from first boot and after HDMI cycle

Since upgrading to a new HDMI receiver, I've been encountering an issue with my
Intel Graphics based systems. On first boot, HDMI output displays fine through
the receiver and on the TV. However, after cycling to another HDMI input on the
receiver and then back to the PC, the screen remains blank.

There may be a deeper issue here, as I see this before KMS has been
initialized, e.g. in the BIOS menu. However, I'm hoping there's something that
can be done to address the issue.

The EDID detected by the system is identical both before and after the cycle.
I've attached the EDID and a dmesg with debugging, which shows the messages on
first boot and then after cycling the input.

I've been able to reproduce this on multiple Intel Graphics based systems
connected to the same HDMI input.

Note that there is a forum discussion on the manufacturer's website that
discusses this specific issue as well:
http://emotivalounge.proboards.com/thread/38824/xmc-pc-hdmi-handshake-problem

Any help would be much appreciated.

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