I too have no mouse in the PS window on linux.
I am running Linux Mint 8 on a Macbook 4,1. (Mouse works if using Mac OS X on this machine, except there are other issues...)
My situation on linux occurs after logging in. I can enter the account/password and select a server, but once the Character Select screen comes up, I've no mouse action.
I will hunt down and post any information that might be useful, just need pointed in the right direction.
Thanks
[edit] hmmm...at work, and apparently not paying much attention...thought this thread was a bit newer...intel graphics seem to consistently be my issue...Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 03)...guess I will snoop drivers]