[Bug 509508] [NEW] FN Brightness keys stopped working on Macbook4,1

[spaetz]

Public bug reported:

This is a spin-off of bug 406515, which was hijacked to be about Lenovo-only. So this one is about Macbooks.
In Karmic the FN Brightness keys don't work in KMS mode; all other fn keys still function as intended.

If I disable KMS via boot parameter "nomodeset", the fn keys work again.
I do not have any files in /sys/class/backlight. Other debug output was
reported in bug 406515, let me know if I can give you more information.
This has been occuring since at least early Karmic alphas until now
(2.6.31-18-generic).

ProblemType: Bug
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  spaetz     2300 F.... pulseaudio
 /dev/snd/controlC0:  spaetz     2300 F.... pulseaudio
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0x90700000 irq 20'
   Mixer name	: 'Realtek ALC889A'
   Components	: 'HDA:10ec0885,106b3600,00100103'
   Controls      : 34
   Simple ctrls  : 21
Card1.Amixer.info:
 Card hw:1 'Headset'/'Logitech Logitech USB Headset at usb-0000:00:1a.7-2.1, full speed'
   Mixer name	: 'USB Mixer'
   Components	: 'USB046d:0a02'
   Controls      : 6
   Simple ctrls  : 2
Date: Tue Jan 19 09:09:38 2010
DistroRelease: Ubuntu 9.10
HibernationDevice: RESUME=UUID=c7ce724c-7bdc-4df0-9ee0-d8cef3f3085a
MachineType: Apple Inc. MacBook4,1
NonfreeKernelModules: wl
Package: linux-image (not installed)
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.31-18-generic root=UUID=76b84d27-4b58-4836-bfea-68506d396d51 ro quiet splash ipv6.disable=1 acpi_backlight=vendor
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, user)
 LANG=C
ProcVersionSignature: Ubuntu 2.6.31-18.55-generic
RelatedPackageVersions:
 linux-backports-modules-2.6.31-18-generic N/A
 linux-firmware 1.26
RfKill:
 2: hci0: Bluetooth
 	Soft blocked: no
 	Hard blocked: no
SourcePackage: linux-meta
Uname: Linux 2.6.31-18-generic x86_64
WpaSupplicantLog:
 
dmi.bios.date: 02/09/08
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MB41.88Z.00C1.B00.0802091535
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Mac-F22788A9
dmi.board.vendor: Apple Inc.
dmi.board.version: PVT
dmi.chassis.asset.tag: Asset Tag#
dmi.chassis.type: 2
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-F22788A9
dmi.modalias: dmi:bvnAppleInc.:bvrMB41.88Z.00C1.B00.0802091535:bd02/09/08:svnAppleInc.:pnMacBook4,1:pvr1.0:rvnAppleInc.:rnMac-F22788A9:rvrPVT:cvnAppleInc.:ct2:cvrMac-F22788A9:
dmi.product.name: MacBook4,1
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.

** Affects: linux-meta (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug

-- 
FN Brightness keys stopped working on Macbook4,1
https://bugs.launchpad.net/bugs/509508
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