ubuntu-x-swat team mailing list archive

[Bryce Harrington <745112@xxxxxxxxxxxxxxxxxx>]

Hi Roland, thanks for the quick response.

Regarding your clarification, yes despite how it may seem, "blank screen
with moving mouse cursor and X not responding to input, but network
login works" is the prototypical set of symptoms that go with a GPU
hang.  The kernel itself is ok, which is why you can ssh in; the mouse
cursor is handled far enough outside the core of X that it is often
unaffected by lockups (not always though).  Often when you have a GPU
lockup, there will be an error message in your 'dmesg' output.  The file
/sys/kernel/debug/dri/0/i915_error_state often displays error codes when
the GPU is locked up.  In fact, if you could reproduce the bug with the
classic/no-effects case and attach both of those here, it might give us
some more clue what's going wrong.  Or, at least, it gives me plenty of
info to take upstream.

Regarding the second conflating bug (which I suspect might be a DPMS bug
in the kernel's arrandale code), I've a PPA you could try to see if it
at least improves that situation:

  https://launchpad.net/~bryce/+archive/elderberry

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https://bugs.launchpad.net/bugs/745112

Title:
  [arrandale] desktop is messed up (goes black) when laptop is docked
  with two external 1920x1200 monitors (x86_64)