[Bug 88746] Re: ehci_hcd module causes I/O errors in USB 2.0 devices

aschuring aelschuring at hotmail.com
Thu Jun 26 12:09:12 UTC 2008

I thought I'd chime in as well. This bug is old, seeing as how Bug #54273 is essentially the same bug. However, I have not been hit hard by this bug until today, under:
root at neminis:~# uname -a
Linux neminis 2.6.24-19-generic #1 SMP Wed Jun 18 14:43:41 UTC 2008 i686 GNU/Linux

My symptoms are a bit strange, though: I have no problems with my
usb-2.0 external harddisk, but instead, Ubuntu fails to recognize my
(usb-1.1) mouse until I unload the ehci module. Also, after various
plug-in-and-out attempts I had my mouse activated, but pressing
ctrl+alt+f7 to return to X caused an USB reset on all hubs, and killed
my mouse again. By now, I'm guessing it's a timing-related issue, seeing
as how a VT switch always causes a 2-second hang on my machine (I'm
using the radeon driver, not fglrx). I'm not familiar with the usb
protocol specs, but is it possible that the ehci driver sometimes fails
to respond in a timely fashion?

I'm attaching my lspci output. Needless to say, I have not changed any
hardware since the last kernel upgrade. I did before have issues with my
mouse not activating after a reboot, but that was always fixed by a
plug-out-and-in sequence. Until the last update, that is.

** Attachment added: "output of lspci -vv"

ehci_hcd module causes I/O errors in USB 2.0 devices
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