Mark Thompson, as per http://www.dell.com/support/drivers/us/en/19/Product/studio-xps-8100 an update is available for your BIOS (A05). If you update to this following https://help.ubuntu.com/community/BiosUpdate , does it change anything?
If not, 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. For more on BIOS updates and linux, please see https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette . Thank you for your understanding. ** Tags added: bios-outdated-a05 ** Changed in: linux (Ubuntu) Status: Triaged => Incomplete -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1046285 Title: NFS client hang with lots of simultaneous operations Status in “linux” package in Ubuntu: Incomplete Bug description: When lots of simultaneous NFS operations from different processes are happening, sometimes all of the processes get stuck in kernel space (uninterruptible sleep) and make no forward progress. The network connection is not the problem (the NFS server is still talkable to by other means - ping, ssh). This has happened to me five times in the last few weeks (four times randomly and once when trying to reproduce it), since upgrading to 12.04 (it never happened here on 10.04). The processes which are stuck can be killed with SIGKILL, but to any normal means are totally unresponsive. Attmpting to talk to the NFS mount from a nonstuck process will immediately get that one stuck as well. The problem can be "fixed" by sending SIGKILL to all stuck processes (being careful not to create any more - if one of the stuck processes was running from a binary on the NFS mount then ps can hang too as it tries to stat it) and unmounting the filesystem. After remounting, everything works as expected again. With an NFS home directory (my random failure case), this basically means that that one user is totally stuck (any access to their home directory hangs the process which does it) and has to have all their processes killed by root to bring the machine back to a working state. The kernel log doesn't mention anything at all, but magic sysrq 'w' was able to extract stack traces of all the blocked processes (see attached) - they are all stuck in NFS-related RPC calls. In general it has happened while building a large source tree on an NFS mount, with many forked processes all competing to talk to the filesystem at the same time. There are no special mount options - it's just a vanilla v3 NFS mount with 'rw' set. I was able to reproduce it once by this method - it happened after leaving six eight-way-forked builds (repeatedly cleaning and building their tree) going for several hours (none of the random failures had use anything like this heavy at the time, though, as far as I can tell). This problem looks similar: http://www.spinics.net/lists/linux-nfs/msg32318.html . However, I don't know enough about the NFS internals to say that it is the same. The script suggested there to reproduce that problem does not fail for me in an hour of running. --- AcpiTables: Error: command ['sudo', 'LC_MESSAGES=C', 'LANGUAGE=', '/usr/share/apport/dump_acpi_tables.py'] failed with exit code 1: mrt is not in the sudoers file. This incident will be reported. AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24. AplayDevices: Error: [Errno 2] No such file or directory ApportVersion: 2.0.1-0ubuntu12 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/controlC2', '/dev/snd/pcmC2D0c', '/dev/snd/by-id', '/dev/snd/controlC0', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/by-path', '/dev/snd/controlC1', '/dev/snd/hwC1D0', '/dev/snd/hwC1D3', '/dev/snd/pcmC1D0c', '/dev/snd/pcmC1D0p', '/dev/snd/pcmC1D1p', '/dev/snd/pcmC1D2c', '/dev/snd/pcmC1D3p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: Error: [Errno 2] No such file or directory Card0.Amixer.info: Error: [Errno 2] No such file or directory Card0.Amixer.values: Error: [Errno 2] No such file or directory Card1.Amixer.info: Error: [Errno 2] No such file or directory Card1.Amixer.values: Error: [Errno 2] No such file or directory Card2.Amixer.info: Error: [Errno 2] No such file or directory Card2.Amixer.values: Error: [Errno 2] No such file or directory CurrentDmesg: Error: command ['sh', '-c', 'dmesg | comm -13 --nocheck-order /var/log/dmesg -'] failed with exit code 1: comm: /var/log/dmesg: Permission denied dmesg: write failed: Broken pipe DistroRelease: Ubuntu 12.04 IwConfig: Error: [Errno 2] No such file or directory MachineType: Dell Inc. Studio XPS 8100 Package: linux (not installed) ProcEnviron: SHELL=/bin/bash TERM=xterm PATH=(custom, no user) LANG=en_GB.UTF-8 ProcFB: 0 nouveaufb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.2.0-29-generic root=UUID=6dbbcb79-2948-4430-8d25-5479f8831106 ro ProcVersionSignature: Ubuntu 3.2.0-29.46-generic 3.2.24 RfKill: Error: [Errno 2] No such file or directory Tags: precise Uname: Linux 3.2.0-29-generic x86_64 UpgradeStatus: Upgraded to precise on 2012-06-15 (82 days ago) UserGroups: dialout video WifiSyslog: dmi.bios.date: 12/09/2009 dmi.bios.vendor: Dell Inc. dmi.bios.version: A03 dmi.board.name: 0T568R dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 3 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA03:bd12/09/2009:svnDellInc.:pnStudioXPS8100:pvr:rvnDellInc.:rn0T568R:rvrA00:cvnDellInc.:ct3:cvr: dmi.product.name: Studio XPS 8100 dmi.sys.vendor: Dell Inc. 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