Bug 16405 - Brightness Adjustment on Toshiba nb305 Netbooks is non-functional.
Summary: Brightness Adjustment on Toshiba nb305 Netbooks is non-functional.
Status: CLOSED CODE_FIX
Alias: None
Product: Drivers
Classification: Unclassified
Component: Video(DRI - Intel) (show other bugs)
Hardware: All Linux
: P1 normal
Assignee: drivers_video-dri-intel@kernel-bugs.osdl.org
URL:
Keywords:
Depends on:
Blocks: 16055
  Show dependency tree
 
Reported: 2010-07-15 23:40 UTC by Cody P Schafer
Modified: 2010-09-12 19:00 UTC (History)
7 users (show)

See Also:
Kernel Version: 2.6.35-rc4-00131-ge467e10
Subsystem:
Regression: Yes
Bisected commit-id:

Attachments
acpidump output (194.40 KB, text/plain)
2010-07-15 23:49 UTC, Cody P Schafer 		Details
test patch which fixes the regression (906 bytes, patch)
2010-07-24 06:00 UTC, Cody P Schafer 		Details | Diff
Add an attachment (proposed patch, testcase, etc.)

Description Cody P Schafer 2010-07-15 23:40:53 UTC 
Overview:
The fn-{brightness up, brightness down} keys on the Toshiba nb305 netbook do not adjust the brightness, nor do they generate ACPI events.

Steps to reproduce:
1.) Boot kernel on a nb305.
2.) Press fn-f5 or fn-f6.

Actual Results:
Brightness of LVDS display stays the same. No output from acpi_listen.

Expected Results:
Change in the brightness of the LVDS display. Video brightness event from acpi_listen.

Bisected: 
First bad commit: 74a365b3f354fafc537efa5867deb7a9fadbfe27
"ACPI: Populate DIDL before registering ACPI video device on Intel"
Comment 1 Matthew Garrett 2010-07-15 23:44:20 UTC 
Ok. Could you please attach the output of the acpidump command?
Comment 2 Cody P Schafer 2010-07-15 23:49:28 UTC 
Created attachment 27127 [details]
acpidump output

Attached acpidump.
Comment 3 Rafael J. Wysocki 2010-07-22 21:36:01 UTC 
First-Bad-Commit : 74a365b3f354fafc537efa5867deb7a9fadbfe27
Handled-By : Matthew Garrett <mjg59-kernel@srcf.ucam.org>
Comment 4 Cody P Schafer 2010-07-24 05:59:22 UTC 
I enabled drm driver debug (cmdline += drm.debug=0x02) and noted that
the "Public ACPI methods not supported" message was encountered.

By calling acpi_video_register even on error, the brightness keys function again.
Comment 5 Cody P Schafer 2010-07-24 06:00:39 UTC 
Created attachment 27236 [details]
test patch which fixes the regression
Comment 6 Rafael J. Wysocki 2010-07-24 22:49:13 UTC 
Patch : https://bugzilla.kernel.org/attachment.cgi?id=27236
Comment 7 Rafael J. Wysocki 2010-09-12 19:00:44 UTC 
Fixed by commit 54b9b308fa39e5147e2edde3492d8650b957be6c .
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