[Bug 108773] i915.fastboot=1 is broken on Thinkpad S1 Yoga (Haswell)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108773

--- Comment #20 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
I think we need to check how the BIOS has programmed the backlight. Please boot
without loading i915, and then do the following:
intel_reg read 0x48250 0x48254 0x48350 0x48354 0x48360 0x48260 0x48264 0x48268
0x48400 0xc8250 0xc8254

You can get intel_reg from igt-gpu-tools/intel-gpu-tools.

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