linux-kernel - Re: various laptop nagles - any suggestions? (note: 2.6.19-rc2-mm1 but applies to multiple kernels)

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Date:	Thu, 19 Oct 2006 19:41:57 -0700
From:	Andrew Morton <akpm@...l.org>
To:	teunis <teunis@...tersgift.com>
Cc:	linux-kernel@...r.kernel.org, Dmitry Torokhov <dtor@...l.ru>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: various laptop nagles - any suggestions?   (note:
 2.6.19-rc2-mm1 but applies to multiple kernels)

On Thu, 19 Oct 2006 09:05:49 -0700
teunis <teunis@...tersgift.com> wrote:

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> Setting the internal clock to 100 Hz stablizes the laptop - and the
> synaptics touchpad stops "crashing"  (when "crashed" the pad reads out
> all kinds of seemingly random values).   I would suspect the driver
> needs adjusting for the variable clock.   Also - it's definitely nicer
> on the laptop power use as far as I can tell - should this be in the
> documentation?

So you're saying that CONFIG_NO_HZ breaks the touchpad?

> I'm very grateful that compact flash-based booting on a SATA system
> works well.   It hasn't been so reliable in 2.6.19-rc2-mm1 for IDE/CF
> adaptors but I haven't yet solved why.   (tested with various laptops)

hm.  What goes wrong?

> resume from "suspend to ram" (ACPI S3 mode) - the keyboard and mouse do
> not recover on 945G chipset.   Note that otherwise the chipset works
> well in 2.6.19-rc2-mm1 - and this is the first kernel that does work well).

So this might not be a new bug?

> LVM2 - when adding and removing physical volumes (again, on Compact
> Flash cards via USB and Firewire adaptors) - it doesn't always remove
> the volume properly (pvremove /dev/sda or equiv) from the device-mapper.
>  This leaves me unable to plug in another.   I suspect this to be an
> LVM2 problem (no hotplug?) rather than a compact flash or SCSI problem.

Can you identify an earlier kernel in which this worked OK?

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