Public bug reported:
I have been running Ubuntu on my Toshiba Portege 3480CT since Dapper
days, without problems. I am currently dual-booting Feisty and Gutsy on
the laptop, and Feisty has no problems. Although the machine is used as
a desktop, I use server mode install, and add my preferred packages for
X.org, Xdm, E17, Abiword, Epiphany, Gnumeric etc afterwards.
However, following a recent apt-get upgrade, I experienced extreme
slowness in booting, and performance in general. Thinking this might be
related to some cruft on the / partition I reformatted it and performed
a fresh server install of Ubuntu Gutsy, but the problem persisted
exactly as before. I do not use locate/updatedb and even an hour after
the machine has booted the problem persists. 'top' does not show any
process(es) using significant CPU time.
I thought it was connected with laptop-mode-tools, because multiple
laptop_mode processes were showing up in the 'top' process list, using
more CPU than I thought they should have been. However I've now
upgraded to ubuntu_laptop_mode and performance is still very slow,
especially in X.org - moving a basic GTK application window (such as
GMPC) around the screen takes CPU to 100% and screen refresh lags
terribly.
For example, the Epiphany window takes some 40-60 seconds or more to
even appear after clicking the icon, so the problem extends beyond basic
display lag. Firefox is even slower. On the other hand, if I boot into
Feisty on the same machine, Epiphany starts in 5-10 seconds as normal.
Watching top when the machine is idle, the CPU is ~ 95% idle. Today's
upgrade from 2.6.22-10 to -11 did not help with the problem.
The problem seems to be ACPI-related, as disabling ACPI using the
acpi=off kernel parameter restores performance. This was unnecessary in
Feisty and earlier versions.
** Affects: ubuntu
Importance: Undecided
Status: New
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[gutsy] Gutsy performance lagging dramatically
https://bugs.launchpad.net/bugs/138423
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