Computer does not shut down, but instead merely freezes at the graphical splash screen while remaining powered on, with monitor, fans, and all other hardware still running. I've attempted the following, all with no success:
- Issuing halt, poweroff, halt -P, shutdown -h/-H/-P, and every other conceivable variation thereof from a terminal. Have also attempted these commands from a tty after killing X.
- Graphical shutdown from unity panel. Have also tried this at login screen.
- Have attempted to disable various services and kernel modules that have been implicated in other bug reports complaining of similar issues (namely, laptop-mode, acpi-support, proprietary fglrx driver, networking, and misc. others).
- Various suggestions from Ubuntu forums (editing /etc/default/halt, updating grub with various different arguments to GRUB_CMDLINE_LINUX_DEFAULT, disabling network-manager service prior to attempting shut down, and others).
This shut down malfunction happens invariably and with total predictability. Oddly, rebooting does initially appear to work, but when computer powers back on, the OS fails to load and instead hangs at a blank, purple screen (without the typical Ubuntu logo).
Other relevant info:
- Computer is an Acer Aspire 5560-7402 laptop.
- Ubuntu is the sole OS, installed recently with default/automatic partitioning settings, using whole disk.
- uname -srvmpio output:
Linux 3.2.0-24-generic #39-Ubuntu SMP Mon May 21 16:52:17 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux (please note that the problem began immediately after installation, i.e., before upgrade from 3.2.0-23-generic kernel).
- lsb_release -rd output:
Description: Ubuntu 12.04 LTS
Release: 12.04
---
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu8
Architecture: amd64
ArecordDevices:
**** List of CAPTURE Hardware Devices ****
card 1: Generic_1 [HD-Audio Generic], device 0: ALC269VB Analog [ALC269VB Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: grisha 3169 F.... pulseaudio
/dev/snd/controlC0: grisha 3169 F.... pulseaudio
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
Card0.Amixer.info:
Card hw:0 'Generic'/'HD-Audio Generic at 0xf0244000 irq 43'
Mixer name : 'ATI R6xx HDMI'
Components : 'HDA:1002aa01,00aa0100,00100200'
Controls : 6
Simple ctrls : 1
Card0.Amixer.values:
Simple mixer control 'IEC958',0
Capabilities: pswitch pswitch-joined penum
Playback channels: Mono
Mono: Playback [on]
Card1.Amixer.info:
Card hw:1 'Generic_1'/'HD-Audio Generic at 0xf0240000 irq 16'
Mixer name : 'Realtek ALC269VB'
Components : 'HDA:10ec0269,1025059f,00100100'
Controls : 20
Simple ctrls : 11
DistroRelease: Ubuntu 12.04
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=752809a0-c0c2-4a3e-922e-32aafd530966
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
MachineType: Acer Aspire 5560
NonfreeKernelModules: wl fglrx
Package: linux (not installed)
ProcEnviron:
TERM=xterm-color
PATH=(custom, user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 EFI VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-24-generic root=UUID=3e6d51a0-a09b-43bd-911e-8297b64dec52 ro acpi=force quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 3.2.0-24.39-generic 3.2.16
RelatedPackageVersions:
linux-restricted-modules-3.2.0-24-generic N/A
linux-backports-modules-3.2.0-24-generic N/A
linux-firmware 1.79
SourcePackage: linux
Tags: precise precise
Uname: Linux 3.2.0-24-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
dmi.bios.date: 12/05/2011
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: V1.15
dmi.board.asset.tag: No Asset Tag
dmi.board.name: Aspire 5560
dmi.board.vendor: Acer
dmi.board.version: A11
dmi.chassis.asset.tag: Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: Acer
dmi.chassis.version: 0.1
dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvrV1.15:bd12/05/2011:svnAcer:pnAspire5560:pvr0.1:rvnAcer:rnAspire5560:rvrA11:cvnAcer:ct9:cvr0.1:
dmi.product.name: Aspire 5560
dmi.product.version: 0.1
dmi.sys.vendor: Acer
apport information