vnc hangs/corrupts

[Mia Via]

>> Fedora 7 or Fedora Core 6, RealVNC, X VNC extension enabled.
>> On one machine, FC6, dell/intel 810, when I VNC into it I get garbage into the background of xscreensaver login, like someone is writing garbage into screen memory.
>> On another machine, Radeon 7500, FC6 or F7, the whole system hangs and needs to be rebooted (power button) if I try to VNC into it, every single time. Leaves some warning messages from drm/radeon on syslog.

> Are you using stand-alone Xvnc or libvnc.so module into X ?

I'm using libvnc.so to share the main display. It's installed under
  /usr/lib/xorg/modules/extensions
but somehow (probably my doing) there's a symbolic link to it in
  /usr/lib/xorg/modules
which is what /var/log/Xorg.0.log reports as being used.

With f7/radeon I get these messages in syslog, before the system hangs, i.e. the next message is the restart message.  Not sure if they were there with fc6 or are a cause or result of the problem:

kernel: [drm:radeon_cp_idle] *ERROR* radeon_cp_idle called without lock held
kernel: [drm:radeon_cp_reset] *ERROR* radeon_cp_reset called without lock held
kernel: [drm:radeon_cp_start] *ERROR* radeon_cp_start called without lock held

I could file a bugzilla report on bugzilla.redhat.com, seeing that you have a RedHat email address, and I do have an account there.

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