[HP Z400 Workstation] log off during working

[Kemistrie]

Since I installed Ubuntu 14.04, my computer has the following error message comes up with blackscreen after automatically logging off:
nouveau E[XORG[1081]] failed to idle channel 0xcccc0000 E[XORG[1081]]
nouveau E[XORG[1081]] failed to idle channel 0xcccc0000 E[XORG[1081]]

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-24-generic 3.13.0-24.47
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: vehabovic 2575 F.... pulseaudio
 /dev/snd/controlC0: vehabovic 2575 F.... pulseaudio
CurrentDesktop: Unity
Date: Tue Jul 15 13:11:01 2014
InstallationDate: Installed on 2014-07-14 (0 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
IwConfig:
 eth0 no wireless extensions.

 lo no wireless extensions.
MachineType: Hewlett-Packard HP Z400 Workstation
ProcFB: 0 nouveaufb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-24-generic root=/dev/mapper/vol_ubuntu-vol_root ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-24-generic N/A
 linux-backports-modules-3.13.0-24-generic N/A
 linux-firmware 1.127.4
RfKill:

SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/29/2010
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 786G3 v03.15
dmi.board.asset.tag: CZC1088KL4
dmi.board.name: 0B4Ch
dmi.board.vendor: Hewlett-Packard
dmi.board.version: D
dmi.chassis.asset.tag: CZC1088KL4
dmi.chassis.type: 6
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvr786G3v03.15:bd10/29/2010:svnHewlett-Packard:pnHPZ400Workstation:pvr:rvnHewlett-Packard:rn0B4Ch:rvrD:cvnHewlett-Packard:ct6:cvr:
dmi.product.name: HP Z400 Workstation
dmi.sys.vendor: Hewlett-Packard

[Brad Figg (brad-figg)]

This change was made by a bot.

[penalvch (penalvch)]

Adissa Vehabovic, as per http://h20566.www2.hp.com/portal/site/hpsc/template.PAGE/public/psi/swdHome/?sp4ts.oid=3718669&spf_p.tpst=swdMain&spf_p.prp_swdMain=wsrp-navigationalState%3DswEnvOID%253D4061%257CswLang%253D%257Caction%253DlistDriver&javax.portlet.begCacheTok=com.vignette.cachetoken&javax.portlet.endCacheTok=com.vignette.cachetoken#BIOS an update to your BIOS is available (3.57). If you update to this following https://help.ubuntu.com/community/BiosUpdate does it change anything? If it doesn't, could you please both specify what happened, and provide the output of the following terminal command:
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date

Please note your current BIOS is already in the Bug Description, so posting this on the old BIOS would not be helpful. As well, you don't have to create a new bug report. As well, you don't have to create a new bug report.

For more on BIOS updates and linux, please see https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette .

Thank you for your understanding.

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]