Bug 12133

Summary:	Backlight brightness is broken (while overlay report the change)
Product:	Mageia	Reporter:	Bernard SIAUD <liste>
Component:	RPM Packages	Assignee:	Mageia Bug Squad <bugsquad>
Status:	RESOLVED DUPLICATE	QA Contact:
Severity:	major
Priority:	High	CC:	fri
Version:	Cauldron
Target Milestone:	---
Hardware:	x86_64
OS:	Linux
URL:	http://www.mageialinux-online.org/forum/topic-17147.php
Whiteboard:
Source RPM:	xrandr-1.4.1-2.mga4.src.rpm	CVE:
Status comment:

Description Bernard SIAUD 2013-12-28 13:35:28 CET

Description of problem:


I can not adjust the brightness of the screen of my laptop. I try with the keyboard or with the command that goes:
xrandr --output LVDS1 --set Backlight 100

nb: before, the amplitude ranged from 0 to 15, now it ranges from 0 to 100

Reproducible: 

Steps to Reproduce:

Comment 1 Morgan Leijström 2014-01-23 22:58:20 CET

Confirming

I also have problems setting the backlight brightness
mga4 RC 64 KDE on LEnovo Thinkpad T61, nvidia proprietary driver.

It have been working now and then since beta2, and also waking from hibernation was buggy, but now ok, so I thought it was a work in progress, but last couple week brightness have been steadly broken.

When pressing the blue Fn key and Home/End there is a overlay indicator i can change from 0 to 100 % but brightness do not change.

Same if i try the slider when clicking the tray battery icon (plus there is another bug that it sometimes hide that indicator as soon as i click the slider)

Also the automatic brightness control set by power management do not work either. 

When i wake it from hibernation without power cable attached, it illuminates very faint. If i hibernate it, plug in power and wake it, it get high illumination.  That is possibly done by hardware.

I am rising priority as i think we should not ship it as is.

What low level command can i try?

I tried the command given in description, but it say i do not have LVDS0 nor LVDS1 (Kde settings say my only screen is LVDS0)

Priority: Normal => High
CC: (none) => fri
Summary: Setting the backlight => Backlight brightness is broken (while overlay report the change)
Severity: normal => major

Comment 2 Morgan Leijström 2014-01-23 23:23:57 CET

This seem to be a dupe of 7299, so i continue there.

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

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