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Regression: backlight regulation not working after upgrate to 5.15

After upgrading to 5.15, the backlight regulation does not work out of the box as it used to. Now, to make it work, it is necessary to use the 'i915.enable_dpcd_backlight=0' kernel parameter.

The machine I am using is a laptop XMG Core 15 e21 (Tongfang motherboard), with an intel 10870h and a WQHD 165hz panel running on it via eDP.

Original issue: #5027 (closed) (closed because two issues were overlapping together)

CC: @effeffe [filippo.falezza at outlook dot it]
Tested-by: @effeffe [filippo.falezza at outlook dot it]

Edited by Filippo Falezza
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