This bug is similar to Bug 983342, except for I'm running a different machine. I can't change the display brightness using the hotkeys (Fn-F9, Fn-F10) on my machine (HP EliteBook 8470p), although the Gnome OSD pops up and the slider moves. Adding "video.use_native_backlight=1" to the kernel command line fixes the problem. I'm running Fedora 20 with the 3.13.10-200.fc20.x86_64 kernel. Output of grep '.*' /sys/class/dmi/id/*_* 2> /dev/null: grep '.*' /sys/class/dmi/id/*_* 2> /dev/null /sys/class/dmi/id/bios_date:10/07/2013 /sys/class/dmi/id/bios_vendor:Hewlett-Packard /sys/class/dmi/id/bios_version:68ICF Ver. F.45 /sys/class/dmi/id/board_asset_tag: /sys/class/dmi/id/board_name:179B /sys/class/dmi/id/board_vendor:Hewlett-Packard /sys/class/dmi/id/board_version:KBC Version 42.36 /sys/class/dmi/id/chassis_asset_tag:CNU3019PY2 /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 8470p /sys/class/dmi/id/product_version:A1029D1102 /sys/class/dmi/id/sys_vendor:Hewlett-Packard
ACPI / video: Add systems that should favour native backlight interface https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/drivers/acpi/blacklist.c?id=0e9f81d
Possible duplicates - Brightness related: Brightness adjustment FN keys doesn't work https://bugzilla.redhat.com/show_bug.cgi?id=702352 Brightness/backlight keys (fn+F8, fn+F9) does not work on lenovo T530 out of the box https://bugzilla.redhat.com/show_bug.cgi?id=947976 Acer Aspire V5-171-9620 display brightness doesn't change using keyboard Fn keys (but onscreen slider moves) https://bugzilla.redhat.com/show_bug.cgi?id=983342 Dell brightness keys register multiple times https://bugzilla.redhat.com/show_bug.cgi?id=986653 unable to adjust monitor brightness with nouveua, Toshiba, and 3.11.0 kernel https://bugzilla.redhat.com/show_bug.cgi?id=999684 Cannot adjust brightness anymore using Fn keys with F19 x86_64 https://bugzilla.redhat.com/show_bug.cgi?id=1012674 Brightness does not change on Intel graphics (using keys or slider) since about 3.9 kernels https://bugzilla.redhat.com/show_bug.cgi?id=1025690 Brightness keys stopped working between kernel 3.12.10-300 and 3.13.3-201 on Asus EEE PC https://bugzilla.redhat.com/show_bug.cgi?id=1067181 T530: Unsupported brightness interface https://bugzilla.redhat.com/show_bug.cgi?id=1089545
Hi, Thanks for the testing. I've written a patch and added it to the Fedora-20 kernel package, where it will get picked up automatically by the next build. I've also started a kernel (scratch) build with the patch added for testing: http://koji.fedoraproject.org/koji/taskinfo?taskID=6803021 Note it is currently still building. Can you please give this build a try, it should work without you needing to specify any kernel cmdline parameters. Regards, Hans
(In reply to Hans de Goede from comment #3) > Hi, > > Thanks for the testing. I've written a patch and added it to the Fedora-20 > kernel package, where it will get picked up automatically by the next build. > > I've also started a kernel (scratch) build with the patch added for testing: > http://koji.fedoraproject.org/koji/taskinfo?taskID=6803021 > Note it is currently still building. > > Can you please give this build a try, it should work without you needing to > specify any kernel cmdline parameters. > > Regards, > > Hans The new build works great! I can adjust the display brightness without any special cmdline parameters.
kernel-3.14.3-200.fc20 has been submitted as an update for Fedora 20. https://admin.fedoraproject.org/updates/kernel-3.14.3-200.fc20
Package kernel-3.14.3-200.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-3.14.3-200.fc20' as soon as you are able to, then reboot. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2014-6122/kernel-3.14.3-200.fc20 then log in and leave karma (feedback).
kernel-3.14.3-200.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report.