Bug 8918

Summary:	backlight brightness does not change
Product:	Mageia	Reporter:	José Jorge <lists.jjorge>
Component:	RPM Packages	Assignee:	Thomas Backlund <tmb>
Status:	RESOLVED DUPLICATE	QA Contact:
Severity:	normal
Priority:	Normal	CC:	oktain
Version:	Cauldron	Keywords:	UPSTREAM
Target Milestone:	---
Hardware:	All
OS:	Linux
Whiteboard:
Source RPM:	kernel	CVE:
Status comment:

Description José Jorge 2013-01-31 21:17:45 CET

While brightness worked with MGA2, with MGA3 kernel 3.8 it does not anymore.
This is because the kernel tells acpi that it is Windows8 : adding the following text to grub kernel line fixes the bug.

acpi_osi="!Windows 2012"

Now can we blacklist this in MGA3 kernels like int his bug report?

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1098216/comments/22

Comment 1 José Jorge 2013-01-31 21:20:45 CET

To make it clear, this is a BIOS bug, as 

/sys/class/backlight/acpi_video0/max_brightness indicates 7 with bug workaround, hile it indicates 100 without. Only levels 1 to 7 change backlight brightness.

Manuel Hiebel 2013-02-01 01:07:51 CET

Keywords: (none) => UPSTREAM
Assignee: bugsquad => tmb

Comment 2 Oleg Kitain 2013-07-20 11:12:32 CEST

Is there any difference between this and bug 7299?

CC: (none) => oktain

Comment 3 José Jorge 2013-07-24 12:09:08 CEST

It seems not, except the workaround was different.

*** This bug has been marked as a duplicate of bug 7299 ***

Status: NEW => RESOLVED
Resolution: (none) => DUPLICATE