Bug 14207

Summary:	Brightness set to max on startup by acer-wmi module
Product:	Drivers	Reporter:	Denis Mukhin (denis_mukhin)
Component:	Platform	Assignee:	acpi_platform-drivers (acpi_platform-drivers)
Status:	CLOSED CODE_FIX
Severity:	low	CC:	acpi-bugzilla, akpm, lenb
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	2.6.28	Subsystem:
Regression:	No	Bisected commit-id:

Description Denis Mukhin 2009-09-22 11:45:40 UTC

Particular environment where reproduced: Acer Aspire 3024 running Ubuntu 9.04 Desktop (kernel 2.6.28-11). 

On startup backlight brightness goes to max. IMHO it happens because of probe routine implementation in acer-wmi module. Looks pretty unreasonable for me: instead of preserving current value from WMI just sets it to max (15 in my case).

Workaround: set particular "brightness" parameter value on module initialization.

Comment 1 Andrew Morton 2009-09-22 19:58:36 UTC

Reassigned to Carlos.

Comment 2 Andrew Morton 2009-09-22 19:59:26 UTC

Reassigned to Carlos (again).

Comment 3 Len Brown 2010-02-19 05:21:10 UTC

http://patchwork.kernel.org/patch/69797/

applied to acpi tree:

commit 6f6ef82cc9de24153ba7d5cedab5970e276aefa1
Author: Carlos Corbacho <carlos@strangeworlds.co.uk>
Date:   Sat Dec 26 19:24:31 2009 +0000

    acer-wmi: Respect current backlight level when loading

Comment 4 Len Brown 2010-02-24 03:37:08 UTC

shipped upstream the day after linux-2.6.33-rc8-git8

closed