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I am running Ubuntu 12.04 on a Core i5 2500K and ASRock Z68 Pro3-M motherboard (no graphics card, hd is a WD Green 1TB, and cd drive is some cheap lite-on drive). Since installing 12.04, my computer has been freezing after resume, but not every time. When I start to resume, it starts going normally with a blinking cursor on the screen and then sometimes it will continue on to the gnome 3 unlock screen. Most of the time, however, it will blink for a little bit and then the monitor will flip modes and shut off due to no signal. Pressing keys on the keyboard gets no response (num lock light doesn't respond, Ctrl-Alt-F1 fails to drop it into a terminal, Ctrl-Alt-Backspace doesn't work) and so I assume the computer is crashed. The worst part is, the logs look entirely normal. Here is my system log during one of these crashes and my subsequent hard poweroff and restart:

Jun  6 21:54:43 kcuzner-desktop udevd[10448]: inotify_add_watch(6, /dev/dm-2, 10) failed: No such file or directory
Jun  6 21:54:43 kcuzner-desktop udevd[10448]: inotify_add_watch(6, /dev/dm-2, 10) failed: No such file or directory
Jun  6 21:54:43 kcuzner-desktop udevd[10448]: inotify_add_watch(6, /dev/dm-1, 10) failed: No such file or directory
Jun  6 21:54:43 kcuzner-desktop udevd[12419]: inotify_add_watch(6, /dev/dm-0, 10) failed: No such file or directory
Jun  6 21:54:43 kcuzner-desktop udevd[10448]: inotify_add_watch(6, /dev/dm-0, 10) failed: No such file or directory
Jun  6 22:09:01 kcuzner-desktop CRON[9061]: (root) CMD (  [ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -depth -mindepth 1 -maxdepth 1 -type f -cmin +$(/usr/lib/php5/maxlifetime) ! -execdir fuser -s {} 2>/dev/null \; -delete)
Jun  6 22:17:01 kcuzner-desktop CRON[22142]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
Jun  6 22:39:01 kcuzner-desktop CRON[26909]: (root) CMD (  [ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -depth -mindepth 1 -maxdepth 1 -type f -cmin +$(/usr/lib/php5/maxlifetime) ! -execdir fuser -s {} 2>/dev/null \; -delete)
Jun  6 22:54:21 kcuzner-desktop kernel: [57905.560822] show_signal_msg: 36 callbacks suppressed
Jun  6 22:54:21 kcuzner-desktop kernel: [57905.560828] chromium-browse[9139]: segfault at 0 ip 00007f3a78efade0 sp 00007fff7e2d2c18 error 4 in chromium-browser[7f3a76604000+412b000]
Jun  6 23:05:43 kcuzner-desktop kernel: [58586.415158] chromium-browse[21025]: segfault at 0 ip 00007f3a78efade0 sp 00007fff7e2d2c18 error 4 in chromium-browser[7f3a76604000+412b000]
Jun  6 23:09:01 kcuzner-desktop CRON[13542]: (root) CMD (  [ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -depth -mindepth 1 -maxdepth 1 -type f -cmin +$(/usr/lib/php5/maxlifetime) ! -execdir fuser -s {} 2>/dev/null \; -delete)
Jun  6 23:12:43 kcuzner-desktop kernel: [59006.317590] usb 2-1.7: USB disconnect, device number 8
Jun  6 23:12:43 kcuzner-desktop kernel: [59006.319672] sd 7:0:0:0: [sdg] Synchronizing SCSI cache
Jun  6 23:12:43 kcuzner-desktop kernel: [59006.319737] sd 7:0:0:0: [sdg]  Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
Jun  6 23:17:01 kcuzner-desktop CRON[26580]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
Jun  6 23:19:04 kcuzner-desktop acpid: client connected from 29925[0:0]
Jun  6 23:19:04 kcuzner-desktop acpid: 1 client rule loaded
Jun  6 23:19:07 kcuzner-desktop rtkit-daemon[1835]: Successfully made thread 30131 of process 30131 (n/a) owned by '104' high priority at nice level -11.
Jun  6 23:19:07 kcuzner-desktop rtkit-daemon[1835]: Supervising 1 threads of 1 processes of 1 users.
Jun  6 23:19:07 kcuzner-desktop rtkit-daemon[1835]: Successfully made thread 30162 of process 30131 (n/a) owned by '104' RT at priority 5.
Jun  6 23:19:07 kcuzner-desktop rtkit-daemon[1835]: Supervising 2 threads of 1 processes of 1 users.
Jun  6 23:19:07 kcuzner-desktop rtkit-daemon[1835]: Successfully made thread 30163 of process 30131 (n/a) owned by '104' RT at priority 5.
Jun  6 23:19:07 kcuzner-desktop rtkit-daemon[1835]: Supervising 3 threads of 1 processes of 1 users.
Jun  6 23:19:07 kcuzner-desktop bluetoothd[1140]: Endpoint registered: sender=:1.239 path=/MediaEndpoint/HFPAG
Jun  6 23:19:07 kcuzner-desktop bluetoothd[1140]: Endpoint registered: sender=:1.239 path=/MediaEndpoint/A2DPSource
Jun  6 23:19:07 kcuzner-desktop bluetoothd[1140]: Endpoint registered: sender=:1.239 path=/MediaEndpoint/A2DPSink
Jun  6 23:19:07 kcuzner-desktop rtkit-daemon[1835]: Successfully made thread 30166 of process 30166 (n/a) owned by '104' high priority at nice level -11.
Jun  6 23:19:07 kcuzner-desktop rtkit-daemon[1835]: Supervising 4 threads of 2 processes of 1 users.
Jun  6 23:19:07 kcuzner-desktop pulseaudio[30166]: [pulseaudio] pid.c: Daemon already running.
Jun  6 23:19:10 kcuzner-desktop acpid: client 2942[0:0] has disconnected
Jun  6 23:19:10 kcuzner-desktop acpid: client 29925[0:0] has disconnected
Jun  6 23:19:10 kcuzner-desktop acpid: client connected from 1286[0:0]
Jun  6 23:19:10 kcuzner-desktop acpid: 1 client rule loaded
Jun  6 23:19:31 kcuzner-desktop bluetoothd[1140]: Endpoint unregistered: sender=:1.239 path=/MediaEndpoint/HFPAG
Jun  6 23:19:31 kcuzner-desktop bluetoothd[1140]: Endpoint unregistered: sender=:1.239 path=/MediaEndpoint/A2DPSource
Jun  6 23:19:31 kcuzner-desktop bluetoothd[1140]: Endpoint unregistered: sender=:1.239 path=/MediaEndpoint/A2DPSink
Jun  6 23:28:12 kcuzner-desktop kernel: imklog 5.8.6, log source = /proc/kmsg started.
Jun  6 23:28:12 kcuzner-desktop rsyslogd: [origin software="rsyslogd" swVersion="5.8.6" x-pid="1053" x-info="http://www.rsyslog.com"] start
Jun  6 23:28:12 kcuzner-desktop rsyslogd: rsyslogd's groupid changed to 103
Jun  6 23:28:12 kcuzner-desktop rsyslogd: rsyslogd's userid changed to 101
Jun  6 23:28:12 kcuzner-desktop rsyslogd-2039: Could not open output pipe '/dev/xconsole' [try http://www.rsyslog.com/e/2039 ]
Jun  6 23:28:12 kcuzner-desktop modem-manager[1070]: <info>  Loaded plugin Ericsson MBM
Jun  6 23:28:12 kcuzner-desktop modem-manager[1070]: <info>  Loaded plugin Sierra
Jun  6 23:28:12 kcuzner-desktop modem-manager[1070]: <info>  Loaded plugin Generic
Jun  6 23:28:12 kcuzner-desktop modem-manager[1070]: <info>  Loaded plugin Huawei
Jun  6 23:28:12 kcuzner-desktop modem-manager[1070]: <info>  Loaded plugin Linktop
Jun  6 23:28:12 kcuzner-desktop bluetoothd[1072]: Failed to init gatt_example plugin
Jun  6 23:28:12 kcuzner-desktop bluetoothd[1072]: Listening for HCI events on hci0
Jun  6 23:28:12 kcuzner-desktop NetworkManager[1080]: <info> NetworkManager (version 0.9.4.0) is starting...
Jun  6 23:28:12 kcuzner-desktop NetworkManager[1080]: <info> Read config file /etc/NetworkManager/NetworkManager.conf
Jun  6 23:28:12 kcuzner-desktop NetworkManager[1080]: <info> VPN: loaded org.freedesktop.NetworkManager.pptp
Jun  6 23:28:12 kcuzner-desktop NetworkManager[1080]: <info> DNS: loaded plugin dnsmasq
Jun  6 23:28:12 kcuzner-desktop kernel: [    0.000000] Initializing cgroup subsys cpuset
Jun  6 23:28:12 kcuzner-desktop kernel: [    0.000000] Initializing cgroup subsys cpu

Sorry it's so huge; the restart happens at 23:28:12 I believe and all I see is that chromium segfaulted a few times. I wouldn't think a segfault from an individual program on the computer would crash it, but could that be the issue?

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This question should instead be filed as a bug report, and as such is off-topic, thanks! Instructions on filing a bug report are here. –  jrg Jul 1 '12 at 21:06
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closed as off topic by jrg Jul 1 '12 at 21:06

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