From: Bruno Ducrot <ducrot@poupinou.org>
To: Eric Oosting <eoosting@yahoo.com>
Cc: cpufreq@lists.linux.org.uk
Subject: Re: cpufreq change appears to cause ps2 mouse hangs
Date: Tue, 26 Apr 2005 12:52:29 +0200 [thread overview]
Message-ID: <20050426105229.GV2298@poupinou.org> (raw)
In-Reply-To: <20050425190459.34415.qmail@web53603.mail.yahoo.com>
On Mon, Apr 25, 2005 at 12:04:59PM -0700, Eric Oosting wrote:
> I wanted to bring a problem I am having to your
> attention in hopes that
> you might be able to help me correct my problem.
>
> I have a dell latitude C600 laptop with a PIII 1Ghz
> proc running the
> latest Ubuntu (5.04) release and 2.6.10. Ubuntu uses
> powernowd to adjust
> frequency scaling.
>
> My problem is that whenever powernowd changes the
> frequency on my cpu my
> mouse hangs for about a second with the following
> error to
> /var/log/messages:
>
> Apr 22 20:58:44 localhost kernel: psmouse.c: TouchPad
> at isa0060/serio1/input0 lost synchronization,
> throwing 4 bytes away.
> Apr 22 20:58:44 localhost kernel: psmouse.c: TouchPad
> at isa0060/serio1/input0 lost sync at byte 1
> Apr 22 20:58:44 localhost kernel: psmouse.c: TouchPad
> at isa0060/serio1/input0 lost sync at byte 1
> Apr 22 20:58:44 localhost kernel: psmouse.c: TouchPad
> at isa0060/serio1/input0 - driver resynched.
> Apr 22 21:06:34 localhost kernel: psmouse.c: TouchPad
> at isa0060/serio1/input0 lost synchronization,
> throwing 1 bytes away.
> Apr 22 21:06:34 localhost kernel: psmouse.c: TouchPad
> at isa0060/serio1/input0 lost sync at byte 1
>
> This also happens if I have a standard USB mouse
> plugged in. If I disable
> powernowd I don't get any hickups. I don't believe the
> problem is directly
> because of powernowd because I am able to reproduce
> the problem by running
> "echo 700000 >
> /sys/device/system/cpu/cpu0/cpufreq/scaling_setspeed"
> or
> setting it back to 1000000.
>
> Have you any ideas on how I might solve or mitigate
> the problems I am
> having? The cpu frequency scaling capabilities of the
> 2.6 kernel are
> wonderful and I would much prefer to fix the problem
> then disable any
> tools that would change the scaling dynamically.
>
What cpufreq driver are you using (speedstep-ich, speedstep-smi)?
What kind of southbridge (ich or piix4 or whatever)?
Could you post a dmesg and a lspci -v?
Also have you the same problem but without ACPI? (I suspect actually
a problem with the power state, a cat /proc/acpi/processor/*/power may
help also)
Cheers,
--
Bruno Ducrot
-- Which is worse: ignorance or apathy?
-- Don't know. Don't care.
prev parent reply other threads:[~2005-04-26 10:52 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-25 19:04 cpufreq change appears to cause ps2 mouse hangs Eric Oosting
2005-04-25 19:19 ` Dmitry Torokhov
2005-04-26 10:52 ` Bruno Ducrot [this message]
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