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

From: Justin Piszcz
Date: Sun Nov 01 2009 - 03:56:02 EST

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

On Sat, 31 Oct 2009 19:43:38 -0400 (EDT)
Justin Piszcz <jpiszcz@xxxxxxxxxxxxxxx> 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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