Comment # 30 on bug 810133 from Takashi Iwai

Thanks, so the cause is getting a bit clearer.  The hang happens in i915 level,
either hardware or software reason.

Now yet a few more information needed:

- Boot with drm.debug=0x0e boot option, take "dmesg -k" command output, and
attach to bugzilla.

- Install the latest upstream kernel (4.1.x) from OBS Kernel:stable repo, and
test with this kernel.

If it's still broken with the latest kernel, I'll prepare a test KMP to disable
acpi lid notification hook in i915 to see whether this triggers the hang.