[Bug 109273] HDMI not working on Skylake with EDID read error

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109273

--- Comment #6 from Jan-Marek Glogowski <glogow at fbihome.de> ---
(In reply to shashank.sharma at intel.com from comment #3)
> From the logs I can see that these 2 devices have different type of adapters:
> 
> Looks like the type-1 adapter is not responding to i2c-over-aux reads after
> one power-down, which is causing the HDMI monitor detection and EDID read
> failure, and driver is assuming there is no HDMI connected, causing blank on
> the screen.

All I found about "type-1" and "type-2" is that the first is just some passive
stuff, while the 2nd is real. I had a look at do_gmbus_xfer and it does some
clock gating for newer HW. But I don't know how all this stuff should work
together.

As you can see, no change for drm-tip. I booted with HDMI already connected, so
there is no plug + unplug in the log.

(In reply to Ville Syrjala from comment #5)
> Looks like the E756 adapter is simply broken. Do you have another machine
> where you could test that adapter?

I was told it works with Windows, but that was quite some time ago. The adapter
is build-in. I can probably organize a Windows install on that machine to
verify, if it really works, if you suspect it's a hardware problem.

Anything else to test before doing the OS swap twice? It'll probably take a
day.

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