ubuntu-x-swat team mailing list archive

[Bryce Harrington <819684@xxxxxxxxxxxxxxxxxx>]

I've heard no other reports of behavior like this, nor have seen it on
my own hardware running oneiric.

I scanned through the log files attached but there's no obvious error
messages.  Were these logs taken from while the system was hung?

If not, reproduce the bug and collect at least dmesg and Xorg.0.log.

One hypothesis is that it is a GPU hang during shutdown.  If this is
true, then while the system is hung there will be a
/sys/kernel/debug/dri/0/i915_error_state file with non-zero contents.
Copy that file and attach it.

Another hypothesis is that the display is entering a power save mode.
You would discern this by the monitor being obviously "off" (power led
changes from green to amber, or the screen grows cold).

A third hypothesis is that the video output got remapped.  This can be
tested by ssh in and doing 'xrandr --verbose' before and after the
freeze.  (You may need to set DISPLAY=:0 in order to do this).

You asked about other troubleshooting information.  You can turn on
modesetting debugging.  Run the command 'sudo xdiagnose' and turn on
graphics debugging (the first checkbox), and then reboot.  Now your
dmesg output should have much more detailed information.  Reproduce the
issue, and then collect dmesg; if the problem is a modesetting bug this
might give some additional clues.

** Changed in: xserver-xorg-video-intel (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/819684

Title:
  No video after logout on Lenovo x220

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