[Bug 237506] New: X crashes when enabling an external monitor if composite is on

[Luis Fernando Planella Gonzalez]

https://bugs.kde.org/show_bug.cgi?id=237506

           Summary: X crashes when enabling an external monitor if
                    composite is on
           Product: kde
           Version: unspecified
          Platform: Ubuntu Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: unassigned-bugs at kde.org
        ReportedBy: lfpg.dev at gmail.com


Version:            (using KDE 4.4.3)
OS:                Linux
Installed from:    Ubuntu Packages

I have a netbook using intel drivers.
In KDE 4.4, if I plug an external monitor and set it not to mirror the
netbook's LCD (for example, placing on the right side of the netbook), X
crashes when composite is on. I have to manually suspend it in order to avoid
the crash.
Composite should be suspended (and not allowed to be enabled) when an external
monitor is active.
I don't know if this is a limitation of intel graphics or something general,
but in GNOME (at least on ubuntu), when an external monitor is activated,
desktop effects are disabled and can't be enabled until a single monitor is set
again.
See https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/559039

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