Bug 60657 - Regression: backlight brightness not changeable with fn keys
Summary: Regression: backlight brightness not changeable with fn keys
Status: CLOSED MOVED
Alias: None
Product: ACPI
Classification: Unclassified
Component: Power-Video (show other bugs)
Hardware: All Linux
: P1 high
Assignee: Aaron Lu
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2013-07-30 21:38 UTC by Thomas Lange
Modified: 2013-07-31 19:34 UTC (History)
1 user (show)

See Also:
Kernel Version: 3.11-rc3
Subsystem:
Regression: Yes
Bisected commit-id:

Attachments
acpidump > acpidump.txt (522.75 KB, text/plain)
2013-07-31 11:58 UTC, Thomas Lange 		Details
git-bisect log (2.73 KB, text/x-log)
2013-07-31 19:20 UTC, Thomas Lange 		Details
Add an attachment (proposed patch, testcase, etc.)

Description Thomas Lange 2013-07-30 21:38:40 UTC 
The fn brightness keys of my Laptop (HP 625) are not working anymore
since kernel version 3.11-rc1.

With older kernels of the 3.10 branch they are working fine.

Setting the brightness manually with
"echo number > /sys/class/backlight/acpi_video0/brightness"
works though.

I have tried adding "acpi_backlight=vendor" as a kernel parameter
but this did not fix it.

Do you need any more information?
Please let me know if this is the case.
Comment 1 Aaron Lu 2013-07-31 05:58:20 UTC 
There is only one commit from v3.10 to v3.11-rc1 regarding ACPI video module, so perhaps this is caused somewhere else.

Please attach acpidump:
# acpidump > acpidump.txt

Possible to bisect it?
Comment 2 Thomas Lange 2013-07-31 11:58:15 UTC 
Created attachment 107052 [details]
acpidump > acpidump.txt
Comment 3 Thomas Lange 2013-07-31 12:11:51 UTC 
I will try to bisect the bug but this needs some time.
Comment 4 Thomas Lange 2013-07-31 19:20:40 UTC 
The bug seems to be related to the hp-wmi module.

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b253c9d1d858a3f115f791ee4fe2b9399ae7dbbd
is the first bad commit.

Attached is the complete git-bisect log.
Comment 5 Thomas Lange 2013-07-31 19:20:58 UTC 
Created attachment 107066 [details]
git-bisect log
Comment 6 Thomas Lange 2013-07-31 19:34:39 UTC 
Reported as https://bugzilla.kernel.org/show_bug.cgi?id=60670.
Closing this one since the problem is not related to ACPI.
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