proc/acpi/button/lid/LID0/state:state: open I can just do a) no brightness b) mid-brighness, and c) full brighness. I used F2 and F3 to increase and decrease the brighness in linear steps (10 steps maybe?).Īfter upgrading to F18 to 3.7 I noticed that my keyboard F2 and F3 shortcuts don't work as expected: i.e. kernel 3.6 the brighness control worked fine. The brightness value in the files mentioned above should change The screen brightness should increase/decrease The OSD brightness applet bar should move up/down The brightness value in these files is not modified: The OSD applet appears but the brightness bar stays fixed and the brightness does not change. Press hardware keys to change screen brightness (Fn+F8/F9 in my case) Boot the computer on kernel 3.7.x with default kernel optionsģ.

Version-Release number of selected component (if applicable):ġ. The computer is a Lenovo Thinkpad X230 () but this seems to affect any hardware using an Intel i915 driver. It happened after upgrading to kernel version 3.7.2. On Gnome the brightness cursor in System Settings works as well to change screen brightness. sys/class/backlight/acpi_video0/brightness sys/class/backlight/intel_backlight/brightness It's neither related to Gnome as it happens also in KDE (see links at the end of this report)Ĭhanging the brightness works by 'echo-ing' a value to these files: It's not a key issue as acpi_listen gets it correctly and the OSD brightness applet appears on keypress (but the brightness bar does not move, nor does the actual brightness). The screen brightness is defined at its maximum value and can not be changed using the hardware buttons (Fn keys). I915-Don-t-provide-ACPI-backlight-interface-if-firmware-expects-Windows-8Ġ001-backlight-introduce-backlight_device_registered.patchĠ002-ACPI-video-seperate-backlight-control-and-event-inte.patchĠ003-ACPI-video-Do-not-register-backlight-if-win8-and-nat.patchĠ004-thinkpad-acpi-fix-handle-locate-for-video-and-query-.patchĠ001-ACPI-video-Add-systems-that-should-favor-native-back.patch Acpi-video-add-function-to-support-unregister-backlight-interfaceĪCPICA-Add-interface-for-getting-latest-OS-version-requested-via-_OSI

Lenovo ideapad brightness issue