On Wed, 21 Dec 2005, Stephen Hemminger wrote:
> My new UPS Belkin F6H375-USB is not correctly picked up by linux
> USB (2.6.15-rc6). The machine is AMD x86_64. It doesn't seem to work
> with 2.6.14 either, haven't gone back older than that.
>
> dmesg
> usb 2-2: new full speed USB device using uhci_hcd and address 5
> usb 2-2: khubd timed out on ep0in len=0/64
> usb 2-2: khubd timed out on ep0in len=0/64
> usb 2-2: khubd timed out on ep0in len=0/64
> usb 2-2: device descriptor read/64, error -110
Can you try applying this diagnostic patch? It should help tell whether
the problem is in the UPS or in uhci-hcd.
When you run the test, don't plug in any USB devices other than the UPS.
Alan Stern
Index: linux-2.6.15-rc5/drivers/usb/host/uhci-q.c
===================================================================
--- linux-2.6.15-rc5.orig/drivers/usb/host/uhci-q.c
+++ linux-2.6.15-rc5/drivers/usb/host/uhci-q.c
@@ -1372,6 +1372,17 @@ static int uhci_urb_dequeue(struct usb_h
goto done;
list_del_init(&urbp->urb_list);
+ {
+ static int cnt;
+
+ if (errbuf && cnt < 2) {
+ ++cnt;
+ uhci_show_qh(urbp->qh, errbuf, ERRBUF_LEN, 0);
+ printk(KERN_DEBUG "URB unlink:\n");
+ lprintk(errbuf);
+ }
+ }
+
if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS)
unlink_isochronous_tds(uhci, urb);
uhci_unlink_generic(uhci, urb);
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