[Linux v4.3-rc6] i915: issues with Skylake integrated graphics

[Eric Biggers <ebiggers3@gmail.com>]

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Hi,

I am testing Linux v4.3-rc6 on a laptop with Intel 'Skylake' integrated
graphics.  The integrated display works, but I noticed several warnings in the
kernel log, and a VGA monitor attached to the HDMI input via a VGA->HDMI adapter
did not work.  Furthermore, the system hung for several seconds during boot.
The two WARNs were:

[    1.078097] WARNING: CPU: 0 PID: 1 at drivers/gpu/drm/i915/intel_pm.c:3321 skl_update_pipe_wm+0x7fa/0x810()
[    1.078097] WARN_ON(p->pixel_rate == 0)
...
[    1.353670] WARNING: CPU: 1 PID: 6 at drivers/gpu/drm/i915/intel_dp.c:854 intel_dp_aux_ch+0x10f/0x6a0()
[    1.353670] dp_aux_ch not started status 0xad40001f

The following error was reported later, when the HDMI input was connected but
the driver failed to report the input as connected:

[   52.553940] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 130

I have attached the full 'dmesg' output for anyone who may find it useful.  

Eric

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