Alan Stern <[EMAIL PROTECTED]> writes: > > On Fri, 14 Dec 2007, Sergio Callegari wrote: > > > I would like to know if this issue had already been reported and > > maybe solved and alternatively if there is some way to _selectively_ > > ban ehci_hcd from attaching to a single hub, rather than disabling it > > completely. > > There is; you can do it through sysfs. For example on my system: > > # cd /sys/bus/pci/drivers/ehci_hcd > # ls > 0000:00:1d.7@ 0000:01:00.2@ 0000:01:01.2@ bind module@ new_id > unbind > > You just have to identify which PCI device corresponds to the > controller you want to disable, and write that name to the "unbind" > file. For example: > > # ls -d 0000:00:1d.7/usb* > 0000:00:1d.7/usb8/ 0000:00:1d.7/usb_host:usb_host8@ > # echo -n 0000:00:1d.7 >unbind > > would disable the EHCI controller for my USB bus 8. > > Alan Stern > > - > To unsubscribe from this list: send the line "unsubscribe linux-usb" in > the body of a message to [EMAIL PROTECTED] > More majordomo info at http://vger.kernel.org/majordomo-info.html > >
What can I say... this is just excellent!!! And it works fine. I have tried and right after the unbinding my UMTS modem becomes visible. So I have a rather elegant workaround for my issue. Now the question is where the initial issue comes from: 1) Buggy hardware 2) Some bug or missing feature in the ehci_hcd driver Personally, I tend to believe that it should not be 1). In this days I have been looking on mailing lists and forums and there are by far too many people lamenting that they need to rmmod ehci_hcd to use their hardware (most of the complaints are related to kernels from 2.6.17 to 2.6.22). As far as I can I will try to pass the good news that they do not need to disable ehci alltogether. Even if it is buggy hardware, I wonder if some some patch in the drivers might be possible since the thing just works in some other os. Thanks again! - To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
