[Bug 101619] DPCD backlight causes black screen on ThinkPad X1 Carbon 4th Gen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101619

--- Comment #5 from Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com> ---
(In reply to Puthikorn Voravootivat from comment #3)
> From you i915_dpcd, address 0x702 is 0xf6
> 
> That means
> BACKLIGHT_BRIGHTNESS_PWM_PIN_CAPABLE == 0
> BACKLIGHT_BRIGHTNESS_AUX_SET_CAPABLE == 1
> 
> From that, look like using DPCD is the right thing.
> This means that the panel advertised wrong DPCD value.

Yeah, except for this caps bit that the panel is advertizing incorrectly, I
can't see anything wrong in the DPCD values.

David, 
Can you please try the debug patch that forces the minimum brightness to a
higher value?

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