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

Justin Piszcz jpiszcz at lucidpixels.com
Sun Nov 1 08:55:53 UTC 2009

On Sat, 31 Oct 2009, Arjan van de Ven wrote:

> 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

Hi Arjan,

Thanks for the reply,


I do not use that option btw:

$ grep CONFIG_USB_SUSPEND .config

I rebooted to the BIOS and verified that the CPU C states are enabled.


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