When I logout of an Xsession (gnome/kde/fvwm2) the system hangs (power cycle required) fairly often. This happens when using the nv or nvidia (x86_64-1.0-7667) drivers and kdm or gdm. When I'm using the nvidia driver, after the logout the nvdia splash screen stays permanently up. This happens on wkstns with an NVS280 and FX3000 nvidia card and NMI message can be CPU0 or CPU1. Has anyone experienced similar issues or able to give any pointers if it's hardware or software? Below are messages from /var/log/messages after a crash:- Aug 11 13:30:09 fourier gdm(pam_unix)[3699]: session closed for user Aug 11 13:30:39 fourier kernel: NMI Watchdog detected LOCKUP on CPU0, rip ffffffff80123e85, registers: Aug 11 13:30:39 fourier kernel: CPU 0 Aug 11 13:30:39 fourier kernel: Pid: 13272, comm: X Not tainted Aug 11 13:30:39 fourier kernel: RIP: 0010:[<ffffffff80123e85>]{.text.lock.fork+39} Aug 11 13:30:39 fourier kernel: RSP: 0018:00000100202e7e38 EFLAGS: 00000086 Aug 12 10:08:14 fourier gpm[3581]: oops() invoked from gpm.c(164) Aug 12 10:08:14 fourier gpm[3581]: /dev/tty0: Input/output error Aug 12 10:08:14 fourier kernel: NVRM: Xid: 16, Head 00000000 Count 004ab839 Aug 12 10:08:14 fourier kernel: NVRM: Xid: 8, Channel 0000001e Aug 12 10:08:14 fourier kernel: NVRM: Xid: 16, Head 00000000 Count 004ab83a Aug 12 10:08:14 fourier kernel: NVRM: Xid: 8, Channel 0000001e Aug 12 10:08:14 fourier kernel: NVRM: Xid: 16, Head 00000000 Count 004ab83b Aug 12 10:08:14 fourier kernel: NVRM: Xid: 8, Channel 0000001e Aug 12 10:08:14 fourier kernel: NMI Watchdog detected LOCKUP on CPU0, rip ffffffff80123e85, registers: Aug 12 10:08:14 fourier kernel: CPU 0 Aug 12 10:08:14 fourier kernel: Pid: 7618, comm: X Tainted: P Aug 12 10:08:14 fourier kernel: RIP: 0010:[<ffffffff80123e85>]{.text.lock.fork+39} Aug 12 10:08:14 fourier kernel: RSP: 0018:0000010079d45e38 EFLAGS: 0000008 Aug 12 13:10:00 fourier kde(pam_unix)[5751]: session closed for user Aug 12 13:10:30 fourier kernel: NVRM: Xid: 16, Head 00000000 Count 0000b182 Aug 12 13:10:30 fourier kernel: NVRM: Xid: 8, Channel 0000001e Aug 12 13:10:30 fourier kernel: NVRM: Xid: 16, Head 00000000 Count 0000b183 Aug 12 13:10:30 fourier kernel: NVRM: Xid: 8, Channel 0000001e Aug 12 13:10:30 fourier kernel: NVRM: Xid: 16, Head 00000000 Count 0000b184 Aug 12 13:10:30 fourier kernel: NVRM: Xid: 8, Channel 0000001e Aug 12 13:10:30 fourier kernel: NMI Watchdog detected LOCKUP on CPU0, rip ffffffff80123e85, registers: Aug 12 13:10:30 fourier kernel: CPU 0 Aug 12 13:10:30 fourier kernel: Pid: 4200, comm: X Tainted: P Aug 12 13:10:30 fourier kernel: RIP: 0010:[<ffffffff80123e85>]{.text.lock.fork+39} cheers, Ronnie -- ======================================================= Name: Dr Ronnie Wallace Institution: University of Strathclyde Department: Mathematics Address: Livingstone Tower, 26 Richmond St, Glasgow, Scotland, UK, G1 1XH =======================================================