More info: when freezes happen, I can move the mouse, but no window
responds; also, switching to a text console works once (it takes about
15-20s to do it).
I was able to run dmesg this time, and it ends with the attached
backtrace; Xorg.0.log says nothing, X thinks everything's fine; it even
logs I'm switching to a text console:
[183594.768] (II) AIGLX: Suspending AIGLX clients for VT switch
Attempting to get back to X (Alt-F7) or to restart lightdm results in an
unusable computer (this time ctrl-alt-Fx no longer works, I have to alt-
sysrq-{s,u,b});
Xorg.0.log.old (the log after "restart lightdm" leaves me with an
unusable machine) ends with this:
[183854.910] (II) GLX: Initialized DRI2 GL provider for screen 0
[183854.912] (II) intel(0): switch to mode 1920x1080@60.0 on eDP1 using pipe 0,
position (0, 0), rotation normal, reflection none
** Attachment added: "backtrace from dmesg"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1402401/+attachment/4331283/+files/backtrace.txt
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https://bugs.launchpad.net/bugs/1402401
Title:
Xorg freeze when switching to text console and back
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