On Tue, Apr 1, 2014, at 09:17 AM, Bo Lorentsen wrote:
> Hi ...
>
> Now that my X1C are working I am quite happy about it, and now I am
> looking at the details.
>
> When I boot the laptop (Debian Jessie + 3.14rc7 + Shuduo's patch) I end
> up in a blank screen, the only way to get anywhere is to suspend it and
> resume, and then i have a beautiful login screen, and the laptop works
> nicely until next reboot.
>
> In the dmesg i get the following remarks :
>
> [ 1.605320] thinkpad_acpi: ThinkPad BIOS GRET32WW (1.09 ), EC unknown
> [ 1.605322] thinkpad_acpi: Lenovo ThinkPad X1 Carbon 2nd, model
> 20A7005LMD
> [ 1.607060] thinkpad_acpi: Unsupported brightness interface, please
> contact ibm-acpi-devel@xxxxxxxxxxxxxxxxxxxxx
> [ 1.607142] thinkpad_acpi: unknown version of the HKEY interface:
> 0x200
> [ 1.607198] thinkpad_acpi: please report this to
> ibm-acpi-devel@xxxxxxxxxxxxxxxxxxxxx
>
> I know the HKEY problem is worked on, but could the "brightness
> interface" problem be related to the blank screen after boot problem ?
Bo,
I've experienced this issue as well (although I didn't know the
suspend/resume trick). The way I've resolved it, from what I've seen on
the 'net is to comment out the following in
drivers/gpu/drm/i915/intel_dp.c at line ~3817:
// bpp = dev_priv->vbt.edp_bpp;
I'm not sure what that does, but works for me. Somone else might have a
nicer solution.
-a
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