http://bugzilla.kernel.org/show_bug.cgi?id=12830
Summary: Dell Vostro 1400 needs acpi_osi=!Window2006 option for
normal cpufreq operation
Product: ACPI
Version: 2.5
KernelVersion: 2.6.29-rc7
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: low
Priority: P1
Component: BIOS
AssignedTo: [email protected]
ReportedBy: [email protected]
Hardware Environment: Dell Vostro 1400
Problem Description: scaling_max_freq stays at 800000 after AC has been
disconnected.
Steps to reproduce:
Boot laptop with AC adapter (cpufreq governor: ondemand) scaling_max_freq =
2001000,
Unplug AC adapter: scaling_max_freq = 800000
Replug AC adapter: scaling_max_freq stays at 800000 and can not be raised
anymore.
This is reproducable in single user mode, so no daemon is interfering with the
governor or frequencies.
Giving acpi_osi=!Window2006 as boot param solves the problem so this seems
related to bug 9919.
I was wondering if this merits a blacklisting of my hardware, so I'm offering
ACPI debug info if needed...
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