[SNB] Blank screen after cycling HDMI receiver input

Submitted by Matthew Horan @mhoran

Assigned to Intel GFX Bugs mailing list

Link to original bug (#100885)

Description

Created attachment 131151
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.

Attachment 131151, "dmesg from first boot and after HDMI cycle":
dmesg