Re: 126.96.36.199: Intel P55 Chipset BUG [usbhid-raw/devices/broken?] [tested 3 different UPS']
- From: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
- Date: Sat, 31 Oct 2009 11:18:27 -0400 (EDT)
On Sat, 31 Oct 2009, Justin Piszcz wrote:
SUMMARY: P55 Chipset/USB has issues with UPS' (broken pipe on 3 diff UPS')
WORKAROUND: Buy/use PCI USB card if you want to use nut/connect a UPS.
NOTES: All other USB (non-UPS) devices seem to function without any
On Thu, 29 Oct 2009, Justin Piszcz wrote:
Problem: When I migrated from a DG965WH -> DP55KG motherboard, there were
quite a bit of issues, host still does not reboot without special flags, e.g.
reboot=a, the NIC driver is broken with the in-kernel version (the one on
e1000.sourceforge) fixes that and finally my UPS USB has driver stale
problems, with two issues already relating to the HW/drivers themselves it
would not be unrealistic to speculate that there could be an issue with the
USB chipset/driver with this P55 motherboard.
Tried another APC 1500VA UPS, same problem occurs, different cable/port etc.
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
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
A bit frustrated, I popped in a PCI card with 4 external USBs, and now no
We might learn something by comparing two usbmon logs for the same UPS
device, one plugged into a USB port on the motherboard and the other
plugged into an add-on card.
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