Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754254AbZCIQPm (ORCPT ); Mon, 9 Mar 2009 12:15:42 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752574AbZCIQPc (ORCPT ); Mon, 9 Mar 2009 12:15:32 -0400 Received: from iolanthe.rowland.org ([192.131.102.54]:36822 "HELO iolanthe.rowland.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1752482AbZCIQPb (ORCPT ); Mon, 9 Mar 2009 12:15:31 -0400 Date: Mon, 9 Mar 2009 12:15:29 -0400 (EDT) From: Alan Stern X-X-Sender: stern@iolanthe.rowland.org To: Maxim Levitsky cc: Greg KH , , Subject: Re: [BUG] Loading both ehci-hcd and uhci-hcd drivers causes my printer to fail In-Reply-To: <1236614253.17511.5.camel@maxim-laptop> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1492 Lines: 43 On Mon, 9 Mar 2009, Maxim Levitsky wrote: > > Is your printer connected directly to the computer, or does it go > > through a hub? (If it is connected directly then EHCI_TT_NEWSCHED > > should not affect it at all.) > > > > If it does go through a hub, does it behave better when you attach it > > directly? > > > > Alan Stern > > > No, it is connected directly. > Just tried 'bad' driver, and firmware upload failed > > Do you mean that CONFIG_USB_EHCI_TT_NEWSCHED doesn't affect the driver > at all when no hub is presented? That's right. Transaction Translators (TTs) live inside hubs. If you don't use a hub then the TT code never runs. > Btw, at least according to lsusb -t, there are no internal hubs in the > printer. What does /proc/bus/usb/devices say? > But it can be a coincidence, it seems that with 'bad' driver printer > works 'better' to as it failed back few days ago much more often, maybe > cable is bad, don't know, but according to the web these printers > 1018/1020.. have usb problems, there is even a readme for that in > foo2zjz > > I try to use the 'good' driver > (without CONFIG_USB_EHCI_TT_NEWSCHED) for some time. Please don't forget to collect usbmon traces when the problem occurs. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/