Bug 470465 - Inverted brightness controll on Lenovo SL300
Summary: Inverted brightness controll on Lenovo SL300
Alias: None
Product: Fedora
Classification: Fedora
Component: kernel
Version: 10
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Kernel Maintainer List
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2008-11-07 11:02 UTC by Michal Ingeli
Modified: 2009-09-29 06:06 UTC (History)
4 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2009-09-29 06:06:53 UTC
Type: ---

Attachments (Terms of Use)
lshal -l (147.41 KB, application/octet-stream)
2008-11-07 11:02 UTC, Michal Ingeli
no flags Details
Patch to fix the brightness issue on ThinkPad SL300 (947 bytes, text/plain)
2008-11-14 23:56 UTC, Lubomir Rintel
no flags Details

System ID Private Priority Status Summary Last Updated
Linux Kernel 12037 0 None None None Never

Description Michal Ingeli 2008-11-07 11:02:49 UTC
Created attachment 322840 [details]
lshal -l

Description of problem:
Controll of brightnes in inverted on this model of ThinkPad (according to thinkwiki, its using IdeaPad firmware). Adding more backlight with Fn+End causes the brightness go down. Fn+Home vice versa. But the logic of controlling backlight is inverted. So the gnome brightness indicator is comming down when brightness is increasing and up, when decreasing. Also, when inactive for several minutes, powersaving sets brightnes to maximum, as it may think, its minimum.

Version-Release number of selected component (if applicable):
up-to-date rawhide

How reproducible:
always with enabled X

Steps to Reproduce:
1. press Fn+Home (with arrow marking down direction)
2. brigtness go up

1. on battery, leave the terminal inactive for several minutes with enabled power saving by decreasing brightness.
2. look ad the difference on the screen brightness

Actual results:
Backlight controll is inverted

Expected results:
Backlight will work according its logic

Additional info:
# dark screen
[root@fight ~]# echo 13 > /sys/class/backlight/acpi_video1/brightness 
# bright screen
[root@fight ~]# echo 0 > /sys/class/backlight/acpi_video1/brightness

Comment 1 Lubomir Rintel 2008-11-14 23:56:22 UTC
Created attachment 323670 [details]
Patch to fix the brightness issue on ThinkPad SL300

This fixes the issue. Reassigning to kernel.

Comment 2 Lubomir Rintel 2008-11-15 15:00:34 UTC
Works for me. Thanks for fast fix. 

btw, this may also apply to all Lenovo SL series.

Comment 3 Michal Ingeli 2008-11-15 15:03:38 UTC
Works for me. Thanks for fast fix. 

btw, this may also apply to all Lenovo SL series.

Comment 4 Lubomir Rintel 2008-11-15 16:26:54 UTC
/me makes a note to himself to drop bugzilla login cookie when working on someone else's lappy, since the result may sound somewhat strange :}

Comment 5 Bug Zapper 2008-11-26 04:57:29 UTC
This bug appears to have been reported against 'rawhide' during the Fedora 10 development cycle.
Changing version to '10'.

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