I recently tried more than one monitor after changing DPM to battery and when the system went bonkers this time: it rebooted after switching from Xorg to terminal.
I readied a camera and snapped the attached photo of the last text. Here's a transcription for search result's sake: <QUOTE> mce: [hardware error]: CPU 2: Machine Check Exception: 4 Bank: fe00000000800400 mce: [hardware error]: TSC 640cdf90bd036 MISC 3ffff mce: [hardware error]: PROCESSOR 0:206a7 TIME 1402881103 SOCKET 0 APIC 4 microcode d mce: [hardware error]: Run the above through "mcelog --ascii" mce: [hardware error]: Some CPUs didn't answer in synchronization mce: [hardware error]: Machine Check: invalid Kernel panic - not syncing: fatal machine check on current CPU Shutting down cpus with NMI drm_kms_helper: panic occured, switching back to text console rebooting in 30 seconds... </QUOTE> I installed the package for mcelog but it probably doesn't matter anymore since the system rebooted. http://www.mcelog.org/faq.html#6 Any ideas? ** Attachment added: "Farewell text from the console prior to reboot." https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/1310064/+attachment/4132114/+files/2014-06-15%2020.15.25.jpg -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1310064 Title: System crashes or auto-reboots only when more than 1 monitor is enabled. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/1310064/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
