Messages in this thread | | | Date | Sun, 1 Nov 2009 16:18:40 -0500 (EST) | From | Justin Piszcz <> | Subject | Re: 2.6.31.4: Intel P55 Chipset BUG [usbhid-raw/devices/broken?] [tested 3 different UPS'] |
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On Sun, 1 Nov 2009, Matthew Dharm wrote:
> On Sun, Nov 01, 2009 at 12:11:44PM -0500, Alan Stern wrote: >> On Sat, 31 Oct 2009, Justin Piszcz wrote: >> >>> 1. 5 minutes of usbmon output on via chipset [working] >>> 2. 5 minutes of usbmon output on intel p55 usb chipset [ehci/not working] >> >> To summarize the differences between the logs, the Intel controller >> shows occasional instances of failed transfers like this: >> >> ffff8802138c8500 3487005687 S Ci:2:004:0 s 81 06 2100 0000 0009 9 < >> ffff8802138c8500 3487006051 C Ci:2:004:0 -32 0 >> >> while the corresponding transfers worked with the VIA controller: >> >> ffff88020c46dd40 1774844264 S Ci:4:002:0 s 81 06 2100 0000 0009 9 < >> ffff88020c46dd40 1774855248 C Ci:4:002:0 0 9 = 09211001 21012237 04 >> >> and indeed they worked in the other Intel logs (the failures appeared >> to be more or less at random). >> >> This does indeed look like a low-level hardware problem, but I'm >> hesitant to blame it on the chipset. For example, the problem might >> lie in the hub you've got between the UPS and the computer. I know, >> this doesn't explain why everything works okay with the VIA controller. >> Probably the only way to tell for sure what's really happening is by >> using an expensive bus analyzer. >> >> Have you tried bypassing that hub, and plugging the UPS directly into >> the computer?
Hi,
I do not use any hubs in this environment, everything is directly attached to the motheboard. Per Matthew (noted below) when I mention hub I am talking about your typical USB hub one would attach to a USB port on the board, not the integrated one on the motherboard. Everything is directly attached from the motherboard to each respective device.
MOBO -> UPS MOBO -> KBD MOBO -> etc
> > I think P55 chipset has an integrated hub, which is not removeable. The > only USB controller is EHCI, and that is connected directly to a hub in the > silicon which provides multiple downstream ports and does the translation > to 1.0 speeds. So the hub cannot be bypassed. > > Two things to note: > > 1) Not all ports on that silicon are the same. Specifically, ports 1 and 9 > have special properties (related to USB-based debugging). You should try > other ports (note that I count ports starting at 0). I have tested every port on the motherboard (the 8 on the back and 4 off of the USB headers on the motherboard): http://home.comcast.net/~jpiszcz/20091101/ports.txt
The problem occurred on every port.
> > 2) I noticed this article: > http://www.theregister.co.uk/2009/10/30/iphone_p55_problems/ -- this may > suggest that there are other issues with P55 chipset and USB. According to > this article, as with this reported issue, adding an external USB hub > doesn't help, but an add-in PCI USB card does. We may have to consider a > P55 issue as a possibility here. Very interesting-- the C-state option for the CPU is on/enabled in the BIOS, it has always remained on, I never disabled it.
Justin.
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