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

[bugzilla-daemon at freedesktop.org]

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

            Bug ID: 109273
           Summary: HDMI not working on Skylake with EDID read error
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: glogow at fbihome.de
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 143056
  --> https://bugs.freedesktop.org/attachment.cgi?id=143056&action=edit
Boot of E756 with HDMI failure.

I have two Skylake based laptops with build-in DP and HDMI output / adapters.
DP works fine on both, but one of them doesn't work with HDMI connections.

The working one is a Fujitsu U757 with, according to intel_hdmi_set_edid, a "DP
dual mode adaptor (type 2 HDMI) detected (max TMDS clock: 300000 kHz)".

The broken one is a Fujitsu E756 with a "DP dual mode adaptor (type 1 HDMI)
detected (max TMDS clock: 165000 kHz)".

The attached logs are from an Ubuntu 4.20 vanilla build.

The attached the snipped shows the U757 when the HDMI-attached monitor is
correctly detected.

The other log is a full boot log with attach and unplug from the broken E756,
minus all the drm:drm_mode_addfb2 calls:

[  109.680992] …
[drm:intel_hdmi_detect [i915]] [CONNECTOR:84:HDMI-A-1]
[drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 0050 w(1)
[drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK on first message, retry
[drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpb] NAK for addr: 0050 w(1)
[drm:drm_do_probe_ddc_edid [drm]] drm: skipping non-existent adapter i915 gmbus
dpb
[drm:intel_hdmi_set_edid [i915]] HDMI GMBUS EDID read failed, retry using GPIO
bit-banging
[drm:intel_gmbus_force_bit [i915]] enabling bit-banging on i915 gmbus dpb.
force bit now 1
[drm:drm_do_probe_ddc_edid [drm]] drm: skipping non-existent adapter i915 gmbus
dpb
[drm:intel_gmbus_force_bit [i915]] disabling bit-banging on i915 gmbus dpb.
force bit now 0
[drm:drm_dp_dual_mode_detect [drm_kms_helper]] DP dual mode HDMI ID: DP-HDMI
ADAPTOR\004 (err 0)
[drm:drm_dp_dual_mode_detect [drm_kms_helper]] DP dual mode adaptor ID: ff (err
0)
[drm:intel_hdmi_set_edid [i915]] DP dual mode adaptor (type 1 HDMI) detected
(max TMDS clock: 165000 kHz)

There were some people claiming broken Intel-HDMI when upgrading from Ubuntu
17.10 to 18.04. So I tried various vanilla Ubuntu kernel builds, with
approximately match Ubuntu released builds, minus some patches:

* 4.20.0-042000-generic
* 4.15.0-39-generic (18.04)
* 4.13.16-041316-generic (17.10)
* 4.4.169-0404169-generic (16.04)

None of them worked for me. Even tried Intel instead of modeset, but that
didn't help too. And I even tried with nomodeset kernel parameter, which didn't
work at all.

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