Bug 60657

Summary:	Regression: backlight brightness not changeable with fn keys
Product:	ACPI	Reporter:	Thomas Lange (thomas-lange2)
Component:	Power-Video	Assignee:	Aaron Lu (aaron.lu)
Status:	CLOSED MOVED
Severity:	high	CC:	aaron.lu
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	3.11-rc3	Subsystem:
Regression:	Yes	Bisected commit-id:
Attachments:	acpidump > acpidump.txt git-bisect log

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.