[Firmware Bug]: ACPI: ACPI brightness control misses _BQC function Brightness key combinations disables entire system on Samsung R439 Laptop

Bug #669411 reported by Prashanth K S on 2010-11-01
22
This bug affects 3 people
Affects Status Importance Assigned to Milestone
acpi (Ubuntu)
Undecided
Unassigned

Bug Description

I just installed Ubuntu 10.10 on my Samsung R439 Laptop. The keyboard works fine normally, but once I change the brightness by using the Fn+Cursor key combo, then the keyboard stops working.

If I press Fn+Up or Fn+Down just once, then the brightness keeps increasing or decreasing continuously and then nothing works. I am unable to type anything using the keyboard. Nothing on the panel works and the color changes upon hovering, but click action just doesnt work.

Basically other than moving around the mouse cursor and scrolling up and down the currently open window, nothing else works. The only way out is to press the power button and reboot the system. No other window or menu opens up.

I can provide any logs or any extra details that you might want.

Thanks,
Prashanth
---
Architecture: amd64
DistroRelease: Ubuntu 10.10
GnomeSessionIdleInhibited: No
GnomeSessionInhibitors: None
GnomeSessionSuspendInhibited: No
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
MachineType: SAMSUNG ELECTRONICS CO., LTD. R439
NonfreeKernelModules: fglrx
Package: gnome-power-manager 2.32.0-0ubuntu1
PackageArchitecture: amd64
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-23-generic root=UUID=5af3d147-c1e1-4163-97f3-b979c2b9cbe2 ro quiet splash
ProcEnviron:
 PATH=(custom, user)
 LANG=en_IN
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.35-23.36-generic 2.6.35.7
Tags: maverick
Uname: Linux 2.6.35-23-generic x86_64
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
dmi.bios.date: 06/05/2010
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: 03US.M004.20100605.LEO
dmi.board.asset.tag: Tag 12345
dmi.board.name: R439
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: Not Applicable
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvr03US.M004.20100605.LEO:bd06/05/2010:svnSAMSUNGELECTRONICSCO.,LTD.:pnR439:pvrNotApplicable:rvnSAMSUNGELECTRONICSCO.,LTD.:rnR439:rvrNotApplicable:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A:
dmi.product.name: R439
dmi.product.version: Not Applicable
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

---
Architecture: amd64
DistroRelease: Ubuntu 10.10
GnomeSessionIdleInhibited: No
GnomeSessionInhibitors: None
GnomeSessionSuspendInhibited: No
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
MachineType: SAMSUNG ELECTRONICS CO., LTD. R439
NonfreeKernelModules: fglrx
Package: gnome-power-manager 2.32.0-0ubuntu1
PackageArchitecture: amd64
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-23-generic root=UUID=5af3d147-c1e1-4163-97f3-b979c2b9cbe2 ro quiet splash
ProcEnviron:
 PATH=(custom, user)
 LANG=en_IN
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.35-23.36-generic 2.6.35.7
Tags: maverick
Uname: Linux 2.6.35-23-generic x86_64
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
dmi.bios.date: 06/05/2010
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: 03US.M004.20100605.LEO
dmi.board.asset.tag: Tag 12345
dmi.board.name: R439
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: Not Applicable
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvr03US.M004.20100605.LEO:bd06/05/2010:svnSAMSUNGELECTRONICSCO.,LTD.:pnR439:pvrNotApplicable:rvnSAMSUNGELECTRONICSCO.,LTD.:rnR439:rvrNotApplicable:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A:
dmi.product.name: R439
dmi.product.version: Not Applicable
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

Hello
can you please run in a terminal
apport-collect -p gnome-power-manager 669411
Thanks
Fabio

summary: - Key combinations disables entire Linux on Samsung R439 Laptop
+ brightness key combinations disables entire Linux on Samsung R439 Laptop
affects: ubuntu → gnome-power-manager (Ubuntu)
Changed in gnome-power-manager (Ubuntu):
status: New → Incomplete

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tags: added: apport-collected
description: updated

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@Fabio,

  Sure, just did that, but I don't know if the bug report is being attached properly. I did get a send report popup, but I don't know what happened after that. I will do the same thing again reproducing the erratic behaviour and I hope another report will go through, though if the system becomes unresponsive, I don't know how I will attach it.

Best.
Prashanth

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description: updated

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The second set of reports have been uploaded while the problem was being reproduced. As you see, the system itself works fine i.e. all processing continues to happen and only the keyboard freezes up. Even the screen, as it is, updates correctly. Its like the Fn key, or the key combo is continuously being pressed and hence no other keys works.

Fabio Marconi (fabiomarconi) wrote :

Hello Prashanth
Al neede info are attached
I set status to new.
Thanks
Fabio

Changed in gnome-power-manager (Ubuntu):
status: Incomplete → New

Architecture: amd64
DistroRelease: Ubuntu 10.04
GnomeSessionIdleInhibited: No
GnomeSessionInhibitors: None
GnomeSessionSuspendInhibited: No
MachineType: SAMSUNG ELECTRONICS CO., LTD. R439
NonfreeKernelModules: wl fglrx
Package: gnome-power-manager 2.30.0-0ubuntu1
PackageArchitecture: amd64
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-28-generic root=UUID=7d2594d1-ee80-43f4-b85c-85ba3a478298 ro splash quiet
ProcEnviron:
 LANG=en_PH.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-28.55-generic 2.6.32.27+drm33.12
Tags: lucid
Uname: Linux 2.6.32-28-generic x86_64
UserGroups: adm admin audio cdrom dialout dip fax floppy fuse lpadmin netdev plugdev sambashare tape video
dmi.bios.date: 06/05/2010
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: 03US.M004.20100605.LEO
dmi.board.asset.tag: Tag 12345
dmi.board.name: R439
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: Not Applicable
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvr03US.M004.20100605.LEO:bd06/05/2010:svnSAMSUNGELECTRONICSCO.,LTD.:pnR439:pvrNotApplicable:rvnSAMSUNGELECTRONICSCO.,LTD.:rnR439:rvrNotApplicable:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A:
dmi.product.name: R439
dmi.product.version: Not Applicable
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

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More info as I can reproduce this bug. Workarounds on adjusting brightness via writing values to /proc/acpi/video/VGA/LCD/brightness works though.

Changed in gnome-power-manager (Ubuntu):
status: New → Confirmed

From BootDmesg.txt
[ 12.306186] [Firmware Bug]: ACPI: ACPI brightness control misses _BQC function

summary: - brightness key combinations disables entire Linux on Samsung R439 Laptop
+ [Firmware Bug]: ACPI: ACPI brightness control misses _BQC function
+ Brightness key combinations disables entire Linux on Samsung R439 Laptop
affects: gnome-power-manager (Ubuntu) → acpi (Ubuntu)
tags: added: amd64 lucid maverick
summary: [Firmware Bug]: ACPI: ACPI brightness control misses _BQC function
- Brightness key combinations disables entire Linux on Samsung R439 Laptop
+ Brightness key combinations disables entire system on Samsung R439
+ Laptop
Fabio Marconi (fabiomarconi) wrote :

Please include the information as separate attachments:

 * Output of sudo dmidecode
    * sudo dmidecode > dmidecode.txt
 * Try to suspend/hibernate and then restart the system and attach /var/log/kern.log.0
 * Tarball of /proc/acpi directory. You can't just tar all files because their content sometimes changes etc.
    * cp -r /proc/acpi /tmp
    * tar -cvjf ~/acpi.tar.bz /tmp/acpi
    * attach acpi.tar.bz from your home directory

Thanks
Fabio

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