kernel-code says, that you should be contacted, if this msg occures...

after updating the kernel, the previous well functioning brightness
fails on a thinkpad e145

after commenting out the line:

tp_features.bright_unkfw = 1;

brighness works again.

to have some more info for you, I checked, which value
tpacpi_check_std_acpi_brightness_support() returns.

it's 101 (decimal)

do you need any further info from the machine?

best regards

w.

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