Bug 1093120

Summary:	Can't change display brightness on HP EliteBook 8470p
Product:	[Fedora] Fedora	Reporter:	Joonas <joonas.pussinen>
Component:	kernel	Assignee:	Hans de Goede <hdegoede>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	unspecified
Version:	20	CC:	gansalmon, hdegoede, itamar, jonathan, joonas.pussinen, kernel-maint, madhu.chinakonda, mchehab
Target Milestone:	---
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:	kernel-3.14.3-200.fc20	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2014-05-10 03:20:24 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Joonas 2014-04-30 16:18:52 UTC

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

Comment 1 poma 2014-04-30 18:33:47 UTC

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

Comment 2 poma 2014-04-30 19:16:52 UTC

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

Comment 3 Hans de Goede 2014-05-01 13:19:11 UTC

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

Comment 4 Joonas 2014-05-04 20:19:30 UTC

(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.

Comment 5 Fedora Update System 2014-05-07 20:53:34 UTC

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

Comment 6 Fedora Update System 2014-05-08 10:11:41 UTC

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).

Comment 7 Fedora Update System 2014-05-10 03:20:24 UTC

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.