Erik Meitner wrote:
> 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.
> 

I guess it's another bug:

$ ck-list-sessions
Session1:
        unix-user = '1001'
        realname = 'gg'
        seat = 'Seat1'
        session-type = ''
        active = TRUE
        x11-display = ':0'
        x11-display-device = '/dev/tty7'
        display-device = ''
        remote-host-name = ''
        is-local = TRUE
        on-since = '2010-05-24T18:10:36.520276Z'
        login-session-id = ''
        idle-since-hint = '2010-05-24T19:20:52.676562Z'
Session5:
        unix-user = '1001'
        realname = 'gg'
        seat = 'Seat2'
        session-type = ''
        active = FALSE
        x11-display = ''
        x11-display-device = ''
        display-device = '/dev/ssh'
        remote-host-name = 'gg-laptop'
        is-local = FALSE
        on-since = '2010-05-24T19:21:59.087478Z'
        login-session-id = ''
$ export DISPLAY=:0
$ xgamma -gamma 1.0
And the terminal hung after the last cmd Ctrl-C gets it back. Keyboard,
mouse are still dead on target/problem machine, screen black. I just
NX'ed in the problem machine & that is working fine. Anything else you'd
like me to check while it's in this state?

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