Cannot change screen brightness on Thinkpad X201

Bug #584635 reported by Paul Yasi on 2010-05-23
This bug affects 3 people
Affects Status Importance Assigned to Milestone
acpi (Ubuntu)

Bug Description

Binary package hint: acpi

I cannot change the screen brightness in Ubuntu 10.04 using the 2.6.32-22-generic ubuntu kernel. The brightness is on full and cannot be lowered with either the Fn buttons or by running a command like echo 50 > /proc/acpi/video/VID/LCD0/brightness

description: updated
Paul Yasi (paul-citrusdb) wrote :

The patched kernel posted in the comments of bug #554569 appears to correct this problem when one switches back to the default of no xorg.conf, and does not use xforcevesa or i915.modeset=0 in grub.

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