Hi all, Is it possible to limit the maximum speed at which a USB 2.0 HUB will connect to USB devices? e.g. to make USB 2 devices connect at FULL_SPEED instead of HIGH_SPEED The reason is that I'm using usb-storage and getting unexpected disconnects from the hcd. >From reading other similar reports I suspect an EMI / power / noise problem on the bus. So I would like to de-rate the bus to run at FULL_SPEED instead of HIGH_SPEED, to see if that helps. Here's an example: ehci_hcd 0000:00:1a.0: fatal error ehci_hcd 0000:00:1a.0: force halt; handhake f8472024 00004000 00004000 -> -110 ehci_hcd 0000:00:1a.0: HC died; cleaning up usb 2-1: USB disconnect, address 2 usb 2-1.3: USB disconnect, address 3 HP Proliant DL120 G7 with ATP industrial-grade USB 2.0 storage modules hcd is connected to a hub on the motherboard, nothing is external (no cables etc). thanks, Iain -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
