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

[David Morgado]

Hi, 
I also have this problem on my laptop, a TOSHIBA Satellite A300D model (PSAK8E-001003PT).
I'm using the latest release of ubuntu 8.10 amd64 with the latest patches as of today.

Some of the solutions pointed here worked from time to time but not
always, there where times that the defaults actually worked. Funny
thing...

Anyway, my webcam (integrated with the laptop) and my wireless card are
usb 2.0 so having ehci-hcd removed is not a option, actually the
wireless card (realtek 8187b integrated) works in usb 1.0 mode but the
webcam is a no go.

I managed to trace the problem back to the webcam module, uvcvideo, by
trial and error blacklisting those usb device modules one at the time in
several combinations.

So there is a conflict with the integrated usb webcam module (uvcvideo)
on my laptop and something else that interferes with the ehci module,
blacklisting the uvcvideo module and everything works fine them,
wireless and usb pendrives.

More, if after this, II manully modprobe for uvcvideo after boot on the
gnome desktop everything keeps working fine webcam included.

One more thing offtopic, not intirely usb related, on this laptop I have
to use acpi_osi="Linux" boot option otherwise this thing keeps rebooting
on halt instead of powering off, and complains about an "irq 9: nobody
cared".


I attached a few ls* and dmesg for this laptop for you viewing pleasure ;).

Thanks

** Attachment added: "PSAK8E.tar.gz"
   http://launchpadlibrarian.net/19516260/PSAK8E.tar.gz

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ehci_hcd module causes I/O errors in USB 2.0 devices
https://bugs.launchpad.net/bugs/88746
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