Bug 28072

Summary:	2.6.38rc Kernels break LCD brightness adjustment on Acer Laptop
Product:	ACPI	Reporter:	Andy (dr.diesel)
Component:	Other	Assignee:	acpi_other
Status:	CLOSED DUPLICATE
Severity:	normal	CC:	florian, maciej.rutecki, rjw
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	2.6.38rc3	Subsystem:
Regression:	Yes	Bisected commit-id:
Bug Depends on:
Bug Blocks:	27352
Attachments:	dmesg dump

Description Andy 2011-02-01 23:07:26 UTC

Description of problem:

Kernel Linux garage 2.6.38-rc3 #1 SMP Tue Feb 1 17:12:58 EST 2011 x86_64 x86_64 x86_64 GNU/Linux LCD brightness function keys on Acer laptop.  This works fine in 2.6.37 builds.  So far all .38 builds have had this problem.


00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07) (prog-if 00 [VGA controller])
	Subsystem: Acer Incorporated [ALI] Device 029b
	Flags: bus master, fast devsel, latency 0, IRQ 43
	Memory at d0000000 (64-bit, non-prefetchable) [size=4M]
	Memory at c0000000 (64-bit, prefetchable) [size=256M]
	I/O ports at 30d0 [size=8]
	Expansion ROM at <unassigned> [disabled]
	Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
	Capabilities: [d0] Power Management version 3
	Kernel driver in use: i915
	Kernel modules: i915

00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
	Subsystem: Acer Incorporated [ALI] Device 029b
	Flags: bus master, fast devsel, latency 0
	Memory at d2400000 (64-bit, non-prefetchable) [size=1M]
	Capabilities: [d0] Power Management version 3


Please see attached dmesg output.  Happy to provide any other info or test
builds/patches etc.

Comment 1 Andy 2011-02-01 23:09:05 UTC

Created attachment 45922 [details]
dmesg dump

Comment 2 Andy 2011-02-01 23:15:30 UTC

Downstream tracker:

https://bugzilla.redhat.com/show_bug.cgi?id=672716

It was filed before I tested the vanilla kernel above.

Thanks!

Comment 3 Rafael J. Wysocki 2011-02-01 23:51:30 UTC

Please test the patch in bug #27702.

Comment 4 Andy 2011-02-02 01:28:40 UTC

Confirmed, the patch in 27702 fixes the issue.

Thanks.

Comment 5 Rafael J. Wysocki 2011-02-02 20:00:39 UTC


*** This bug has been marked as a duplicate of bug 27702 ***