I just wanted to add to my previous post, in case it makes any
difference:

- Right before the successful test I installed the toggle compositing
plasma widget, and used it to toggle the effects (previously I did it
directly in system settings)

- After a reboot, I did get the message that desktop effects have been
suspended. However, after a couple of seconds if I click the toggle
icon, the desktop effects are resumed and remain functional from this
point on (previously it would always turn itself back off immediately no
matter what I did)

- Although the system is now fully usable and effects work ok, on a
clean system after reboot with a single open konsole window running
top/htop and nothing else going on anywhere, I see plasma-desktop, Xorg
and kwin processes all taking up 6%-12% CPU all the time. Still sounds
to me like way too much for an idle system, and bad for battery life...
but at least the system is usable.

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which is subscribed to xserver-xorg-video-intel in Ubuntu.
https://bugs.launchpad.net/bugs/774207

Title:
  [Natty Intel 945GME] No desktop effects (kwin 100% cpu)

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