Bug#405467: linux-image-2.6.18-3-amd64: uses 100% CPU time handling hardware interrupts from parallel port
On Wed, Jan 03, 2007 at 09:16:34PM +0100, ludovic@ludovic-brenta.org wrote:
>
> On my HP Compaq nx6325 laptop (AMD Turion 64x2), the kernel uses 100%
> of one CPU core to handle hardware interrupts (i.e. the "hi" field in
> top is 100%).
>
> As a consequence, the CPU will never scale its frequency down to 800
> MHz, even with powernowd installed and running. As further
> consequences, energy consumption and heat production are abnormally
> high, and battery life is abnormally low.
>
> Unloading (with rmmod) the modules parport and parport_pc solves this
> problem. However I have to do that after each reboot.
just blacklist them in /etc/modprobe.d
echo parport > /etc/modprobe.d/nx6325_parportlove
echo parport_pc > /etc/modprobe.d/nx6325_parportlove
> Attached are the outputs of lspci -v, acpidump, and dmidecode, in case
> that's useful.
you'd anyway newer kernels for this box and even not applied upstream ones,
so i'd appreciate if you understand that 2.6.18 is not a good cut off
for HP NXxxxx.
--
maks
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