amd64/181357: LCD Brightness Control not working on Lenovo X121e (ACPI issue?)
Matthias Petermann
matthias at petermann-it.de
Sat Aug 24 15:10:11 UTC 2013
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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