Is it possible to get a USB bus trace to see if it's really the TT dropping/swallowing the interrupt traffic, or if the device itself is failing to respond? I have seen a USB device chip that sometimes didn't respond (at all) to interrupt-in polls...
As far as disabling TTs, it's impossible to communicate with full/lowspeed devices connected to highspeed hubs without using the hub's TT. Only other option is to enumerate the hub at fullspeed instead... On Wed, 29 Mar 2006, Pete Zaitcev wrote: >FC-5 has shipped and I get all sorts of interesting bugs. Here's one... > https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=187244 >Apparently, nothing works through a hub, system keeps cycling and >resetting. > >Mar 29 16:57:50 localhost kernel: usb 3-3.2: USB disconnect, address 10 >Mar 29 16:57:51 localhost kernel: usb 3-3.2: new low speed USB device using >ehci_hcd and address 11 >Mar 29 16:57:51 localhost kernel: usb 3-3.2: configuration #1 chosen from 1 >choice >Mar 29 16:57:51 localhost kernel: input: Dell Dell USB Keyboard as >/class/input/input3452 >Mar 29 16:57:51 localhost kernel: input: USB HID v1.10 Keyboard [Dell Dell USB >Keyboard] on usb-0000:00:03.2-3.2 >Mar 29 16:57:51 localhost kernel: drivers/usb/input/hid-core.c: input irq >status >-71 received >Mar 29 16:57:51 localhost last message repeated 3 times >Mar 29 16:57:51 localhost kernel: usb 3-3.2: USB disconnect, address 11 >Mar 29 16:57:51 localhost kernel: usb 3-3.2: new low speed USB device using >ehci_hcd and address 12 > >And so on and so forth. This is far from the only instance of such >symptoms. I think that possibly a few 2.0 hubs had TT terminally broken. >What is the best way to disable TT per-device or system-wide? >The way ehci-q.c handles it does not seem to have any obvious knob. > >-- Pete > > >------------------------------------------------------- >This SF.Net email is sponsored by xPML, a groundbreaking scripting language >that extends applications into web and mobile media. Attend the live webcast >and join the prime developer group breaking into this new coding territory! >http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642 >_______________________________________________ >[email protected] >To unsubscribe, use the last form field at: >https://lists.sourceforge.net/lists/listinfo/linux-usb-devel > -- Dan Streetman [EMAIL PROTECTED] --------------------- 186,272 miles per second: It isn't just a good idea, it's the law! ------------------------------------------------------- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642 _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
