[Bug 111202] Intel_backlight fails to change eDP1 brightness on Dell Precision 5540 (Coffeelake)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111202

--- Comment #13 from Jani Nikula <jani.nikula at intel.com> ---
Apologies if that came out rude; everyone looking at this bug would think this
is about backlight, which it was initially, and that was resolved. So please
let's investigate the energy saving issue you apparently already had with your
7510 machine in a different bug.

Please also drop the other parameters; I don't know what you try to achieve
with:

i915.enable_dc=2 i915.disable_power_well=0 i915.enable_fbc=1
i915.enable_dpcd_backlight=1 acpi_osi=Linux-Dell-Video

Usually none of them should be required, and indeed setting some of the i915
parameters is strictly not supported by upstream. They are for debug purposes
only.

Finally, please don't add logs as comments. Please attach them.

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