[Ubuntu-x-swat] [Bug 1583246] Re: System freezes after returning from locked screen

I experienced this issue (or something similar) yesterday. I used the alt-sysrq-1 and alt-sysrq-t combo mentioned in the document linked to in the last comment and after sometime the machine started responding again. I captured the kern.log and will attach it here in case it's useful. **

[Ubuntu-x-swat] [Bug 1583246] [NEW] System freezes after returning from locked screen

Public bug reported: Quite frequently when I lock my screen (or it locks itself) and I unlock it the system is responsive for a few seconds but then completely freezes. I can't reboot but have to turn off the power on the machine. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: xorg

[Ubuntu-x-swat] [Bug 858550] Re: [sandybridge-m-gt2 ] GPU lockup render.IPEHR: 0x7a000002

*** This bug is a duplicate of bug 830136 *** https://bugs.launchpad.net/bugs/830136 -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-intel in Ubuntu. https://bugs.launchpad.net/bugs/858550 Title: [sandybridge-m-gt2 ]

[Ubuntu-x-swat] [Bug 858550] [NEW] [sandybridge-m-gt2 ] GPU lockup render.IPEHR: 0x7a000002

*** This bug is a duplicate of bug 830136 *** https://bugs.launchpad.net/bugs/830136 Public bug reported: I'm submitting this error as prompted by the OS. ProblemType: Crash DistroRelease: Ubuntu 11.10 Package: xserver-xorg-video-intel 2:2.15.901-1ubuntu2 ProcVersionSignature: Ubuntu