I'm using an X1 Carbon with 13.10 and the brightness control works fine.
On Wed, Jan 1, 2014 at 11:29 AM, CSRedRat <1098...@bugs.launchpad.net>wrote: > Fixed? Can i'm buy X1 Carbon? :) > > -- > You received this bug notification because you are subscribed to the bug > report. > https://bugs.launchpad.net/bugs/1098216 > > Title: > Regression in brightness control on Lenovo Thinkpad X230 (+tablet) and > X1 Carbon > > Status in The Linux Kernel: > In Progress > Status in “linux” package in Ubuntu: > Triaged > Status in “linux” package in Fedora: > Unknown > > Bug description: > == Raring SRU Justification == > > Impact: A number of ThinkPad models have a workaround in the ACPI > backlight implementation for Windows 8 that more or less completely > breaks backlight control. > > Fix: Add an OSI quirk to no longer claim to be Windows 8 on these > machines, causing the firmware to revert to the older, working behavior. > > Test Case: Verified on LP #1098216 and bugzill.kernel.org #51231. > > --- > > Something changed between the 3.5 and the 3.7 kernel, leading to > broken brightness control on my Thinkpad x230. > > Here are some test results: > == 3.5.0-21-generic == > === Post-boot values === > /sys/class/backlight: > - intel-backlight > + actual_brightness => 4438 > + bl_power => 0 > + brightness => 4438 > + max_brightness => 4438 > - acpi_video0 > + actual_brightness => 15 > + bl_power => 0 > + brightness => 15 > + max_brightness => 15 > > === Tests === > echo 0 > acpi_video0/brightness => works > echo 0 > intel_backlight/brightness => works > > == 3.8.0-0-generic == > === Post-boot values === > /sys/class/backlight: > - intel-backlight > + actual_brightness => 4438 > + bl_power => 0 > + brightness => 4438 > + max_brightness => 4438 > - acpi_video0 > + actual_brightness => 100 > + bl_power => 0 > + brightness => 100 > + max_brightness => 100 > > === Tests === > echo 0 > acpi_video0/brightness => doesn't do anything > echo 0 > intel_backlight/brightness => works > --- > ApportVersion: 2.8-0ubuntu1 > Architecture: amd64 > CheckboxSubmission: 12108b8b8b67d760cdd84f1b9574e7f3 > CheckboxSystem: bb422ca46d02494cdbc459927a98bc2f > DistroRelease: Ubuntu 13.04 > InstallationDate: Installed on 2012-09-02 (129 days ago) > InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64 > (20120902) > MarkForUpload: True > Package: linux (not installed) > ProcEnviron: > LANGUAGE=en_US:en > TERM=xterm > PATH=(custom, no user) > LANG=en_US.UTF-8 > SHELL=/bin/bash > ProcVersionSignature: Ubuntu 3.8.0-0.1-generic 3.8.0-rc3 > Tags: raring > Uname: Linux 3.8.0-0-generic x86_64 > UnreportableReason: The running kernel is not an Ubuntu kernel > UpgradeStatus: No upgrade log present (probably fresh install) > UserGroups: > > WORKAROUND: > > Add to /etc/default/grub > in the variable "GRUB_CMDLINE_LINUX_DEFAULT": > > acpi_osi=\"!Windows 2012\" > > e.g: > > GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=\"!Windows 2012\"" > > Then run "sudo update-grub". > > To manage notifications about this bug go to: > https://bugs.launchpad.net/linux/+bug/1098216/+subscriptions > -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1098216 Title: Regression in brightness control on Lenovo Thinkpad X230 (+tablet) and X1 Carbon To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1098216/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
