[Bug 546578] Re: black screen after a few user switches

[Erik Meitner]

NoOP: Reproduce the problem, ssh to the machine(without -X option), find
the X display number with "ck-list-sessions" , do "export DISPLAY=:z"
where "z" is the display number, then run "xgamma -gamma 1.0". Does this
resolve the problem? If not, then you are experiencing another bug.

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black screen after a few user switches
https://bugs.launchpad.net/bugs/546578
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