Description of problem: Brightness keys works but no difference in brightness # grep '.*' /sys/class/dmi/id/*_* 2> /dev/null /sys/class/dmi/id/bios_date:05/19/2014 /sys/class/dmi/id/bios_vendor:Hewlett-Packard /sys/class/dmi/id/bios_version:M84 Ver. 01.01 /sys/class/dmi/id/board_asset_tag:Base Board Asset Tag /sys/class/dmi/id/board_name:221C /sys/class/dmi/id/board_vendor:Hewlett-Packard /sys/class/dmi/id/board_version:KBC Version 63.13 /sys/class/dmi/id/chassis_asset_tag:XXXXXXXXXXX /sys/class/dmi/id/chassis_type:10 /sys/class/dmi/id/chassis_vendor:Hewlett-Packard /sys/class/dmi/id/chassis_version: /sys/class/dmi/id/product_name:HP EliteBook 745 G2 /sys/class/dmi/id/product_version:A3009DD10303 /sys/class/dmi/id/sys_vendor:Hewlett-Packard Version-Release number of selected component (if applicable): How reproducible: Steps to Reproduce: 1. FN+F9-F10 2. 3. Actual results: Expected results: Additional info: Same problem as https://bugzilla.redhat.com/show_bug.cgi?id=903136 video.use_native_backlight=1 works and solves the problem. Tested on 3.15.6-200.fc20.x86_64
I've added a patch for this to the official Fedora 20 kernel packages, so it should get picked up by the next F-20 kernel build. When that happens please test without video.use_native_backlight=1 on the kernel commandline and confirm that everything still works as it should.
p.s. And thanks for the bug report!
kernel-3.15.7-200.fc20 has been submitted as an update for Fedora 20. https://admin.fedoraproject.org/updates/kernel-3.15.7-200.fc20
Package kernel-3.15.7-200.fc20: * should fix your issue, * was pushed to the Fedora 20 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing kernel-3.15.7-200.fc20' as soon as you are able to, then reboot. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2014-9010/kernel-3.15.7-200.fc20 then log in and leave karma (feedback).
kernel-3.15.7-200.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report.
kernel-3.15.7-200 confirmed working without using video.use_native_backlight=1 Thanks Hans for your quick update!