Hello,

regarding this PR I made some further observation. Even the acpi_ec_write seems to not have any effect on the brightness, the values set to the appropriate register (IBM_EC_BRIGHTNESS 0x31) survive a reboot.

Looks like the values are stored correctly, but EC doesn't care for them when setting brightness?

I'm not sure where to look next. Could this be a hardware issue with the Device?

Kind regards,
Matthias
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