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    SubjectRe: PROBLEM: Performance drop
    On Thu, May 24, 2012 at 02:12:39AM +0700, Comrade DOS wrote:
    > PROBLEM: Performance drop
    >
    > After the release of linux 3.4.0 I've updated the kernel on all my machines.
    > In most of the computer upgrade was successful.
    > However, on my old laptop (HP Compaq 6715b) after the upgrade was just
    > impossible to work.
    > I found that CPU frequency scaling no longer work properly on this machine.
    > After loading the CPU clock is reset to the minimum (800 MHz), and
    > remains so until you reboot.
    > Changing the type of governor is not helping.
    > Recompile the kernel without CPU frequency scaling has been to solve
    > the problem, but even after this performance leaves much to be desired
    > (although, according to /proc/cpuinfo CPU frequency set maximum).
    > In addition to the above-described problems, there is another - the
    > problem with rebooting and shutting down (and possibly also have a
    > problem with s2ram and/or s2disk, but I'm their functionality I have
    > not tested).
    > If you try to shut down or restart the laptop it hangs.

    This somehow reminds me of commit
    26adcfbf00e0726b4469070aa2f530dcf963f484 (x86: SB600: skip ACPI IRQ0
    override if it is not routed to INT2 of IOAPIC).

    See also
    https://bugzilla.kernel.org/show_bug.cgi?id=11715 and
    https://bugzilla.kernel.org/show_bug.cgi?id=11516

    Question is why the quirk doesn't work (anymore) on your system.

    What was the kernel release used before 3.4.0 was install on your
    Laptop?

    Please provide dmesg with apic=debug kernel option when kernel 3.4 is
    booted?

    Can you please try to boot with kernel paramter
    acpi_use_timer_override in another test run and with
    acpi_skip_timer_override in a 3rd test (and also using acpi=debug in
    both cases) and provide dmesg output for those testruns.


    Thanks,

    Andreas


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