[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 #3 from shashank.sharma at intel.com <shashank.sharma at intel.com> ---
>From the logs I can see that these 2 devices have different type of adapters:

The success case (U757): is a type 2 DP->HDMI
[drm_kms_helper]] DP dual mode HDMI ID: DP-HDMI ADAPTOR\004 (err 0)
[drm_kms_helper]] DP dual mode adaptor ID: a0 (err 0)
[i915]] DP dual mode adaptor (type 2 HDMI) detected (max TMDS clock: 300000
kHz)


The failure case (E756): is a Type 1 DP->HDMI 
[drm_kms_helper]] DP dual mode HDMI ID: DP-HDMI ADAPTOR\004 (err 0)
[drm_kms_helper]] DP dual mode adaptor ID: ff (err 0)
[i915]] DP dual mode adaptor (type 1 HDMI) detected (max TMDS clock: 165000
kHz)

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.

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