> 1. Mouse out of sync on guest machines (Filipe
Miranda)
> Anyway, everything worked just fine, but I noticed the
the my mouse
> pointer
> is totally out of sync in either text mode or graphic
mode.
> Is anyone having the same issue? Or is it a bug? or a
misconfiguration?
I was pretty traumatised by this when I first ran the FC6
guest install.
It works like this:
- X drivers on the guest are expecting regular mouse
movement signals (eg
"The mouse is moving left, fast")
- VNC provides absolute mouse coordinates (X,Y)
- XenFB tries to translate the two, but can't sync the
pointers well
because it gets no signals back from the guest about the
absolute position
and pointer accelleration.
After installation the mouse pointers can be aligned pretty
well by
setting the mouse accelleration on the guest so that they
move at the same
rate. You then need to chase the pointer into a corner to
align them. This
way the guest accelleration matches the arbitrary value
XenFB is using.
During installation I've found it's best to turn the mouse
accelleration
right down on the *host*. I found that this would let me
move the *host*
mouse pointer to the middle of the VNC window to give me
fairly free
movement on the guest pointer.
Unfortunately this is going to persist until some method is
put in so that
either the guest X server can accept absolute coordinates (a
virtual
absolute position pointer device it understands) or there's
some for the
host to find out where the guest pointer is. I believe that
work is being
done on this now, but we'll have to be patient with it.
SDL probably has the same issue, but I think it can
"grab" (hold) the
mouse pointer so that it doesn't run out of the window in
the same way it
does with VNC. It does this with fully virtualised machines
from what I've
seen.
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=
201220
Robert
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