The same problem here. My netbook is an Asus 1001HA.
If I use just one monitor (the netbook's display or another external
monitor), everything works perfectly. But if I use *both* netbook's
display and an external monitor, the computer turns unusable.
Using System monitor, I've noticed that the compiz process uses about
85% of CPU time when running on multimonitor setup (despite the memory
usage is stable).
** Also affects: unity
Importance: Undecided
Status: New
** Changed in: unity
Status: New => Confirmed
** Changed in: unity (Ubuntu)
Status: New => Confirmed
** Tags added: multimonitor
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https://bugs.launchpad.net/bugs/769650
Title:
dual monitor runs unusably slow (Asus 1000HE, Intel 945GME)
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