Bug 746016

Summary:	Lenovo Y450 Screen Brightness
Product:	[Fedora] Fedora	Reporter:	Conal <conalmccrudden>
Component:	kernel	Assignee:	Kernel Maintainer List <kernel-maint>
Status:	CLOSED DUPLICATE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	high	Docs Contact:
Priority:	unspecified
Version:	16	CC:	dennis, gansalmon, itamar, jonathan, kernel-maint, madhu.chinakonda, next.little.owl, rh
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2011-11-07 20:00:29 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:

Description Conal 2011-10-13 16:29:13 UTC

Description of problem:
The shortcut key to change brightness of the the screen on Lenovo Y450 is recognised, however the screen brightness does not change. The shortcut key is Fn + Up Arrow/Down Arrow.

Comment 1 Václav Mocek 2011-10-30 23:15:03 UTC

The same problem on Lenovo Ideapad S205.

Do you have problem described here?

https://bugzilla.redhat.com/show_bug.cgi?id=748210

When you switch off/on the backlight, the system crashes.

Comment 2 Josh Boyer 2011-11-07 20:00:29 UTC

This is likely a duplicate of 748210 as Václav suggested.  If a kernel with that fix comes out and you still have issues, please reopen.

*** This bug has been marked as a duplicate of bug 748210 ***

Comment 3 rh 2011-11-08 00:17:45 UTC

(In reply to comment #0)
> Description of problem:
> The shortcut key to change brightness of the the screen on Lenovo Y450 is
> recognised, however the screen brightness does not change. The shortcut key is
> Fn + Up Arrow/Down Arrow.

You may have installed the proprietary nVIDIA driver. You need to modify the xorg.conf.

First execute nvidia-xconfig as root, and then edit /etc/X11/xorg.conf, change the Device section like this:

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    Option         "RegistryDwords"     "EnableBrightnessControl=1"
EndSection

(Notice the "Option" line)

(This is NOT a bug)