[Nut-upsuser] Intel P55 Chipset BUG [usbhid-raw/devices/broken?] [tested 3 different UPS']

Arjan van de Ven arjan at infradead.org
Sun Nov 1 00:07:49 UTC 2009

On Sat, 31 Oct 2009 19:43:38 -0400 (EDT)
Justin Piszcz <jpiszcz at lucidpixels.com> wrote:
> >> Problem appears to be the Intel P55KG / USB Chipset in the way
> >> that it handles usbhid-raw devices as CD/USB sticks/kbd/mouse/etc
> >> do not appear to be affected.
> >>
> >> So far all other USB devices work fine, with the exception of
> >> UPS', I have tested two APC 1500VA (one an RS the other an XS), in
> >> addition I also have a 'BELKIN 1200VA UPS with AVR' from a long
> >> time ago, the same problem occurs.
> >
> > ...
> >
> >> A bit frustrated, I popped in a PCI card with 4 external USBs, and
> >> now no more errors:

just as a wild guess;
does it go away if you disable CONFIG_USB_SUSPEND ?

also, google suggests that your bios may not have c-states enabled;
if so, enabling those in the bios might also be a good idea

Arjan van de Ven 	Intel Open Source Technology
CentreCONFIG_USB_SUSPEND For development, discussion and tips for power
savings,visit http://www.lesswatts.org

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