fan always on on a sony vgn-n370e since kubutu 8.10

[xavier]

Binary package hint: acpi

Since an upgrade to 8.10, the fan is always on, even when the laptop is idle (powertop around 100 wakeup per second, nearly 100% in C2)
It worked as expected on the previous version of kubuntu.

      Output of uname -a
Linux hemingway 2.6.27-13-generic #1 SMP Thu Feb 26 07:26:43 UTC 2009 i686 GNU/Linux

 lspci output attached

   cp -r /proc/acpi /tmp
cp: cannot open `/proc/acpi/event' for reading: Device or resource busy

Any idea ?

Xavier