[Bug 109750] Second display does not show up on dock of Lenovo Helix 2

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109750

Ville Syrjala <ville.syrjala at linux.intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #14 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
Hmm. Could be the BIOS has a borked VBT. Looks like you're booting in EFI mode
so it shouldn't be due to busted legacy mode support in the BIOS (which is
somewhat common).

Please attach a copy of /sys/kernel/debug/dri/0/i915_vbt

Also when you have the external display connected to the dock please do this as
root:
"modprobe i2c-dev ; for i in `seq 0 9` ; do i2cdetect -y $i 0x50 0x50 ; done"
and attach the result here. That should tell is if an EDID can be detected on
any i2c bus.

Is the BIOS capable of lighting up the external display on the dock? If yes, it
would be helpful if you can boot without loading i915 (eg. pass
modprobe.blacklist=i915,snd_hda_intel to the kernel cmdline and prevent all gui
stuff from starting up). Once up and running w/o i915 loaded you should grab a
register dump with "intel_reg dump" and attach here. intel_reg is part of igt:
git://anongit.freedesktop.org/xorg/app/intel-gpu-tools

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