Bug 1005409

Summary:	acpi brightness weirdness
Product:	[Fedora] Fedora	Reporter:	Kevin Fenzi <kevin>
Component:	kernel	Assignee:	Kernel Maintainer List <kernel-maint>
Status:	CLOSED RAWHIDE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	rawhide	CC:	gansalmon, itamar, jonathan, kernel-maint, madhu.chinakonda, marcelo.barbosa
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Hardware:	Unspecified
OS:	Unspecified
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Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2013-09-15 18:42:26 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 Kevin Fenzi 2013-09-06 20:23:05 UTC

3.12.0-0.rc0.git12.1.fc21.x86_64

Close lid and go away for a while. I have xfce4-power-manager set to switch off the display if the computer is inactive for 15min.

Come back and open the lid and the brightness is way way down and the controls don't work to change it. 

Xorg.0.log has: 

[ 20260.867] (EE) intel(0): failed to open /sys/class/backlight/acpi_video0/brightness for backlight control: No such file or directory
[ 20260.871] (EE) intel(0): failed to open /sys/class/backlight/acpi_video0/actual_brightness for backlight control: No such file or director

The /sys/class/backlight/acpi_video0 directory doesn't exist. 

However, there is a /sys/class/backlight/acpi_video1 directory. 

Doing a echo 12 > /sys/class/backlight/acpi_video1/brightness causes the lcd to go back to bright. 

So, something is removing the acpi_video0 dir/controls on monitor power off and readding them as 1 after turning back on. 

Happy to provide more info or try things.

Comment 1 Kevin Fenzi 2013-09-15 18:42:26 UTC

This seems to be fixed in 3.12.0-0.rc0.git25.1.fc21.x86_64 at least.