https://bugzilla.kernel.org/show_bug.cgi?id=42725
Summary: PROBLEM: Unusable Slowness In 2.6.38-8 - 3.2.0-12 when
ACPI is enabled
Product: ACPI
Version: 2.5
Kernel Version: 2.6.38-8
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: high
Priority: P1
Component: ACPICA-Core
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: No
When using any recent *ubuntu, Gentoo or Fedora releases with a 2.6.38-8+
kernel on an Asus N51V laptop, the entire system including the console is
incredibly slow, almost to the point of inoperability.
"top" reports that most processes take almost 100% CPU.
The entire system is very slow at responding to even the most basic shell
commands.
This has been tracked in the Ubuntu Launchpad under bug #793437
(https://bugs.launchpad.net/ubuntu/+source/linux/+bug/793437), but they have
been unable to reach a solution.
Affects:
The problem affects all "stable" kernels since 2.6.38-8, although I personally
have not tested any past 3.2.0-12. A few 2.6.39 merges/commits were tested in
the previously mentioned Launchpad bug report, many of them failed.
Workarounds:
Booting with the "acpi=off" flag seems to eliminate the problem, but this is
not ideal for a laptop. Some users have reported that booting, entering sleep
mode, then waking the laptop also solves the problem; but it returns after
rebooting.
Steps to reproduce the problem:
1) Boot any *Ubuntu, Gentoo, or Fedora distribution with 2.6.38-8+ kernel.
2) Attempt to use the system.
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