Ubuntu
linux package

(regression) no backlight control

Bug #1005196 reported by Fabio Valentini on 2012-05-27

This bug affects 1 person

Affects		Status	Importance	Assigned to	Milestone
	Linux	Invalid	Medium	linux-kernel-bugs #43310
	linux (Ubuntu)	Fix Released	Medium	Unassigned

Bug Description

beginning with 3.4-rc1, backlight control seems to be not working for my laptop.
the keyboard shortcuts have no effect and the backlight settings are not displayed in gnome-control-center.

I compiled the latest 3.3.y-series stable kernel from kernel.org and those things just work fine.
but it neither works with the latest kernel from the quantal repository, nor with the latest kernel from kernel.ubuntu.com/~kernel-ppa/mainline.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: linux-image-3.4.0-3-generic 3.4.0-3.8
ProcVersionSignature: Ubuntu 3.4.0-3.8-generic 3.4.0
Uname: Linux 3.4.0-3-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.25.
AplayDevices: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden
ApportVersion: 2.1-0ubuntu1
Architecture: amd64
ArecordDevices: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: fafa 2592 F.... pulseaudio
/dev/snd/controlC0: fafa 2592 F.... pulseaudio
CRDA: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden
Card0.Amixer.info: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden
Card0.Amixer.values: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden
Card1.Amixer.info: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden
Card1.Amixer.values: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden
CurrentDmesg: Error: command ['sh', '-c', 'dmesg | comm -13 --nocheck-order /var/log/dmesg -'] failed with exit code 1: comm: /var/log/dmesg: Permission denied
Date: Sun May 27 17:06:42 2012
IwConfig: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden
MachineType: Sony Corporation VGN-FW21M
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.4.0-3-generic root=UUID=00af886a-3745-48e6-977c-f4ee44273aa4 ro resume=UUID=e6c0dda7-539c-4ee3-87a9-5374d6dbc04e quiet splash radeon.pcie_gen2=1 vt.handoff=7
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
WifiSyslog:

dmi.bios.date: 08/27/2009
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: R1100Y0
dmi.board.asset.tag: N/A
dmi.board.name: VAIO
dmi.board.vendor: Sony Corporation
dmi.board.version: N/A
dmi.chassis.asset.tag: N/A
dmi.chassis.type: 10
dmi.chassis.vendor: Sony Corporation
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrR1100Y0:bd08/27/2009:svnSonyCorporation:pnVGN-FW21M:pvrC600TFNR:rvnSonyCorporation:rnVAIO:rvrN/A:cvnSonyCorporation:ct10:cvrN/A:
dmi.product.name: VGN-FW21M
dmi.product.version: C600TFNR
dmi.sys.vendor: Sony Corporation
---
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.25.
AplayDevices: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden
ApportVersion: 2.1-0ubuntu1
Architecture: amd64
ArecordDevices: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: fafa 2407 F.... pulseaudio
/dev/snd/controlC0: fafa 2407 F.... pulseaudio
CRDA: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden
Card0.Amixer.info: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden
Card0.Amixer.values: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden
Card1.Amixer.info: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden
Card1.Amixer.values: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden
DistroRelease: Ubuntu 12.10
IwConfig: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden
MachineType: Sony Corporation VGN-FW21M
Package: linux 3.4.0.3.4
PackageArchitecture: amd64
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.4.0-3-generic root=UUID=00af886a-3745-48e6-977c-f4ee44273aa4 ro resume=UUID=e6c0dda7-539c-4ee3-87a9-5374d6dbc04e quiet splash radeon.pcie_gen2=1 vt.handoff=7
ProcVersionSignature: Ubuntu 3.4.0-3.8-generic 3.4.0
PulseList:
Error: command ['pacmd', 'list'] failed with exit code 1: Home directory /home/fafa not ours.
No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
linux-restricted-modules-3.4.0-3-generic N/A
linux-backports-modules-3.4.0-3-generic N/A
linux-firmware 1.80
Tags: quantal
Uname: Linux 3.4.0-3-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

See original description

Tags:

Revision history for this message

Fabio Valentini (fafatheone-deactivatedaccount) wrote on 2012-05-27:

AcpiTables.txt Edit (174.4 KiB, text/plain; charset="utf-8")
AlsaDevices.txt Edit (599 bytes, text/plain; charset="utf-8")
Card0.Codecs.codec.0.txt Edit (12.5 KiB, text/plain; charset="utf-8")
Card0.Codecs.codec.1.txt Edit (160 bytes, text/plain; charset="utf-8")
Card1.Codecs.codec.0.txt Edit (1.1 KiB, text/plain; charset="utf-8")
Dependencies.txt Edit (2.0 KiB, text/plain; charset="utf-8")
Lspci.txt Edit (16.4 KiB, text/plain; charset="utf-8")
Lsusb.txt Edit (647 bytes, text/plain; charset="utf-8")
PciMultimedia.txt Edit (1.2 KiB, text/plain; charset="utf-8")
ProcCpuinfo.txt Edit (1.5 KiB, text/plain; charset="utf-8")
ProcEnviron.txt Edit (294 bytes, text/plain; charset="utf-8")
ProcInterrupts.txt Edit (1.8 KiB, text/plain; charset="utf-8")
ProcModules.txt Edit (3.0 KiB, text/plain; charset="utf-8")
PulseList.txt Edit (18.1 KiB, text/plain; charset="utf-8")
RfKill.txt Edit (186 bytes, text/plain; charset="utf-8")
UdevDb.txt Edit (138.2 KiB, text/plain; charset="utf-8")
UdevLog.txt Edit (300.4 KiB, text/plain; charset="utf-8")

Revision history for this message

Brad Figg (brad-figg) wrote on 2012-05-27: Missing required logs.

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1005196

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

Changed in linux (Ubuntu):
status:	New → Incomplete

Revision history for this message

Fabio Valentini (fafatheone-deactivatedaccount) wrote on 2012-05-27: AcpiTables.txt

AcpiTables.txt Edit (174.4 KiB, text/plain)

apport information

tags:	added: apport-collected
description:	updated

Revision history for this message

Fabio Valentini (fafatheone-deactivatedaccount) wrote on 2012-05-27: AlsaDevices.txt

AlsaDevices.txt Edit (599 bytes, text/plain)

apport information

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Fabio Valentini (fafatheone-deactivatedaccount) wrote on 2012-05-27: BootDmesg.txt

BootDmesg.txt Edit (59.3 KiB, text/plain)

apport information

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Fabio Valentini (fafatheone-deactivatedaccount) wrote on 2012-05-27: Card0.Codecs.codec.0.txt

Card0.Codecs.codec.0.txt Edit (12.5 KiB, text/plain)

apport information

Revision history for this message

Fabio Valentini (fafatheone-deactivatedaccount) wrote on 2012-05-27: Card0.Codecs.codec.1.txt

Card0.Codecs.codec.1.txt Edit (160 bytes, text/plain)

apport information

Revision history for this message

Fabio Valentini (fafatheone-deactivatedaccount) wrote on 2012-05-27: Card1.Codecs.codec.0.txt

Card1.Codecs.codec.0.txt Edit (1.1 KiB, text/plain)

apport information

Revision history for this message

Fabio Valentini (fafatheone-deactivatedaccount) wrote on 2012-05-27: CurrentDmesg.txt

CurrentDmesg.txt Edit (871 bytes, text/plain)

apport information

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Fabio Valentini (fafatheone-deactivatedaccount) wrote on 2012-05-27: Dependencies.txt

#10

Dependencies.txt Edit (2.2 KiB, text/plain)

apport information

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Fabio Valentini (fafatheone-deactivatedaccount) wrote on 2012-05-27: Lspci.txt

#11

Lspci.txt Edit (36.5 KiB, text/plain)

apport information

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Fabio Valentini (fafatheone-deactivatedaccount) wrote on 2012-05-27: Lsusb.txt

#12

Lsusb.txt Edit (647 bytes, text/plain)

apport information

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Fabio Valentini (fafatheone-deactivatedaccount) wrote on 2012-05-27: PciMultimedia.txt

#13

PciMultimedia.txt Edit (4.3 KiB, text/plain)

apport information

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Fabio Valentini (fafatheone-deactivatedaccount) wrote on 2012-05-27: ProcCpuinfo.txt

#14

ProcCpuinfo.txt Edit (1.5 KiB, text/plain)

apport information

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Fabio Valentini (fafatheone-deactivatedaccount) wrote on 2012-05-27: ProcEnviron.txt

#15

ProcEnviron.txt Edit (294 bytes, text/plain)

apport information

Revision history for this message

Fabio Valentini (fafatheone-deactivatedaccount) wrote on 2012-05-27: ProcInterrupts.txt

#16

ProcInterrupts.txt Edit (1.8 KiB, text/plain)

apport information

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Fabio Valentini (fafatheone-deactivatedaccount) wrote on 2012-05-27: ProcModules.txt

#17

ProcModules.txt Edit (3.0 KiB, text/plain)

apport information

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Fabio Valentini (fafatheone-deactivatedaccount) wrote on 2012-05-27: RfKill.txt

#18

RfKill.txt Edit (186 bytes, text/plain)

apport information

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Fabio Valentini (fafatheone-deactivatedaccount) wrote on 2012-05-27: UdevDb.txt

#19

UdevDb.txt Edit (138.3 KiB, text/plain)

apport information

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Fabio Valentini (fafatheone-deactivatedaccount) wrote on 2012-05-27: UdevLog.txt

#20

UdevLog.txt Edit (291.3 KiB, text/plain)

apport information

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Fabio Valentini (fafatheone-deactivatedaccount) wrote on 2012-05-27: WifiSyslog.txt

#21

WifiSyslog.txt Edit (641.2 KiB, text/plain)

apport information

Changed in linux (Ubuntu):
status:	Incomplete → Confirmed

Revision history for this message

madbiologist (me-again) wrote on 2012-05-28:

#22

During this phase of the Ubuntu release cycle, the Ubuntu kernel team has rebased the Ubuntu kernel with the upstream mainline kernel. Unfortunately, it is sometimes the case that bugs can still exist in the upstream mainline kernel. The upstream kernel has its own bug tracking system. See https://wiki.ubuntu.com/Bugs/Upstream/kernel for guidelines on reporting your bug to the upstream kernel bug tracker.

Revision history for this message

madbiologist (me-again) wrote on 2012-05-28:

#23

Also see https://wiki.ubuntu.com/Kernel/Debugging/Backlight

In particular, try adding acpi_backlight=vendor to your kernel boot parameters on the GRUB command line.

Revision history for this message

Fabio Valentini (fafatheone-deactivatedaccount) wrote on 2012-05-28:

#24

fwts-3.4-results.log Edit (123.0 KiB, text/plain)

Setting acpi_backlight=vendor didn't change anything, still no entries in /sys/class/backlight for 3.4, like there are for 3.3.7.

I encountered some errors concering the DSDT, though.
I tried with both 3.4 ubuntu kernel and my own vanilla 3.3.7 kernel, I got the same results using fwts:
The reassembly of DSDT failed because of some "zero length" errors.

Something odd I found in my dmesg for 3.4 and 3.3.7 is the two lines
[ 0.687620] [Firmware Bug]: ACPI: No _BQC method, cannot determine initial brightness
[ 24.098132] sony_laptop: brightness ignored, must be controlled by ACPI video driver
for both kernels.

But then, I wonder why backlight control works with 3.3.7 and it doesn't with 3.4, when I get the same test results and corresponding dmesg outputs.

I will also report this bug upstream.
thank you for your help so far!

Bug Watch Updater (bug-watch-updater) on 2012-05-28

Changed in linux:
importance:	Unknown → Medium
status:	Unknown → Confirmed

Joseph Salisbury (jsalisbury) on 2012-05-29

Changed in linux (Ubuntu):
importance:	Undecided → Medium
tags:	added: kernel-bug-exists-upstream

Joseph Salisbury (jsalisbury) on 2012-05-30

Changed in linux (Ubuntu):
status:	Confirmed → Triaged

Bug Watch Updater (bug-watch-updater) on 2012-06-07

Changed in linux:
status:	Confirmed → Incomplete

Bug Watch Updater (bug-watch-updater) on 2012-06-12

Changed in linux:
status:	Incomplete → Invalid

Revision history for this message

Fabio Valentini (fafatheone-deactivatedaccount) wrote on 2012-07-03:

#25

a fix was commited upstream as of linux 3.5-rc5 and included in ubuntu with the latest rebase (linux-3.5.0-3.3).

Changed in linux (Ubuntu):
status:	Triaged → Fix Committed

Julian Wiedmann (jwiedmann) on 2012-07-23

Changed in linux (Ubuntu):
status:	Fix Committed → Fix Released

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(regression) no backlight control

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