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Old 01-13-2013, 04:25 PM   #1
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Question After replacing thinkpad screen, brightness control stopped working

Good evening!

Good to be here. I replaced the screen of my Thinkpad edge 13, after it suffered for more than 6 month from the well-known central vertical lines-problem...
With the new screen, the brightness control via FN-F7/F8 stopped working.
Even manually it's not possible to set the brightness.

ls /sys/class/backlight/*/brightness
where max_brightness equals 4422465 (!) for the first and 15 for the second.
FN-F7/F8 writes to thinkpad_screen/brightness, but also echo'ing numbers from the interval [0 - 4422465] to intel_backlight/brightness can only turn on and off the backlight, but not dim it.

I changed
GRUB_CMDLINE_LINUX_DEFAULT="quiet acpi_backlight=vendor"
and ran update-grub. Didn't help.

Do you have some ideas how I could rule out hardware problems?
Would be great to get some pieces of advice!


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