Public bug reported:
If I plug my laptop (Sony VAIO VGN-FS285M) to the mains, graphics
performance drops by a ten fold. Playing a simple, low resolution XviD
video file is choppy and 3D is also very poor.
Graphics performance is actually much better when laptop's unplugged and
running on its battery, and the CPU is running at 800 MHz (as opossed to
a max of 1733 MHz).
I am running Kubunty Edgy, clean installation (from yesterday) and all
official updates installed. The only difference is that I'm running KDE
3.5.5 from the Kubuntu repositories (I don't see how KDE can affect
this, but I also tested on fluxbox for the sake of it with the same
results).
This happens using both "nvidia" and "nv" drivers on X.
CPU performance doesn't seem affected; for example, encoding to XviD is
as fast as it was when running Dapper or Breezy. IO performance seems
right as well. Only actual video performance seems affected.
The laptop has a Pentium M 1.7 processor on a Centrino chipset, 1 gig
DDR 333 RAM, and nVidia GeForce 6200Go graphics.
** Affects: Ubuntu
Importance: Undecided
Status: Unconfirmed
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Poor graphics performance when Laptop's powered
https://launchpad.net/bugs/72185
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