Re: 220.127.116.11: 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
Thanks for the reply,
I do not use that option btw:
$ grep CONFIG_USB_SUSPEND .config
# CONFIG_USB_SUSPEND is not set
I rebooted to the BIOS and verified that the CPU C states are enabled.
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