Bug 14207 - Brightness set to max on startup by acer-wmi module
Summary: Brightness set to max on startup by acer-wmi module
Status: CLOSED CODE_FIX
Alias: None
Product: Drivers
Classification: Unclassified
Component: Platform (show other bugs)
Hardware: All Linux
: P1 low
Assignee: acpi_platform-drivers@kernel-bugs.osdl.org
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2009-09-22 11:45 UTC by Denis Mukhin
Modified: 2010-10-08 18:22 UTC (History)
3 users (show)

See Also:
Kernel Version: 2.6.28
Subsystem:
Regression: No
Bisected commit-id:

Attachments
Add an attachment (proposed patch, testcase, etc.)

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
Note You need to log in before you can comment on or make changes to this bug.