I've migrated to the LST Enablement Stack and after a few days agree
that this seems to have been resolved with the newer kernel and xorg
components (although it's hard to know for sure - on the 3.16 kernel I
think I would have had a problem by now, however).
That's for 3.19.0-26-generic #28~14.04
Unfortunately, I've recently found that switching to a TTY doesn't
always work, and sometimes the screen remains black no matter what is
done and a forced reboot is required.
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I'm also having this issue on a new Lenovo X1 Carbon generation 3 (model
20BS CT01 WW). The screen will go black at random intervals and a
similar stacktrace is produced on dmesg. Switching to a TTY and back
(ctrl+alt+F1 and then back to ctrl+alt+f7, for example) returns to a
functional Xorg. This
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