[Bug 92685] New: [i915 Skylake] HDMI output does not work; "dp_aux_ch not started" warning

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92685

            Bug ID: 92685
           Summary: [i915 Skylake] HDMI output does not work; "dp_aux_ch
                    not started" warning
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: ebiggers3 at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 119210
  --> https://bugs.freedesktop.org/attachment.cgi?id=119210&action=edit
kernel log with drm.debug=14

Running Linux 4.3-rc7 on a laptop with Intel Skylake integrated graphics, I
encountered warnings in the kernel log and a several second hang during boot.
Furthermore, an external monitor attached to the HDMI input did not work.  The
problems occur every boot.  The full dmesg output with drm.debug=14 is
attached; some highlights are shown below:

[    1.401196] [drm:intel_dp_aux_ch] *ERROR* dp aux hw did not signal timeout
(has irq: 1)!
[    1.414508] [drm:intel_dp_aux_ch] *ERROR* dp aux hw did not signal timeout
(has irq: 1)!
[    1.427851] [drm:intel_dp_aux_ch] *ERROR* dp aux hw did not signal timeout
(has irq: 1)!
[    1.427853] [drm:intel_dp_aux_ch] *ERROR* dp_aux_ch not done status
0xad40001f
[    1.447865] ------------[ cut here ]------------

[    1.447867] WARNING: CPU: 1 PID: 6 at drivers/gpu/drm/i915/intel_dp.c:854
intel_dp_aux_ch+0x10f/0x6a0()
[    1.447867] dp_aux_ch not started status 0xad40001f
...
[    8.043643] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid,
remainder is 130
...
[   32.571277] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid,
remainder is 130
...
[   32.608835] i915 0000:00:02.0: HDMI-A-1: EDID block 0 invalid.

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