Bug 9665

Summary:	ehci-hcd blocks usblp with HP CM1015 printer on NVidia 680i chipset
Product:	Drivers	Reporter:	Fred Emmott (mail)
Component:	USB	Assignee:	Greg Kroah-Hartman (greg)
Status:	RESOLVED INSUFFICIENT_DATA
Severity:	normal	CC:	alan, protasnb, stern
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	2.6.24-rc6	Subsystem:
Regression:	No	Bisected commit-id:
Bug Depends on:
Bug Blocks:	5089

Description Fred Emmott 2007-12-30 05:57:26 UTC

Most recent kernel where this bug did not occur: not found
Distribution: Slamd64
Hardware Environment: SMP, EM64T (x86_64), NVidia NForce 680i chipset
Software Environment: glibc 2.7, udev 116
Problem Description:

usblp will neither be automatically loaded if the ehci-hcd module is present, or work if loaded manually, with a HP CM1015 printer. Works on another machine (Thinkpad X61s), with exact same kernel and userspace. "rmmod ehci-hcd" makes the usblp driver work, and after that, "modprobe ehci-hcd" makes usblp give up the device, and the lp device is destroyed. Have tried 2.6.23.1, 2.6.22.8, 2.6.23.12, 2.6.24-rc4 and 2.6.24-rc6.

Steps to reproduce:
- Plug an HP CM1015 USB printer into an onboard USB port on an EVGA 122-CK-NF68 board (NForce 680i) while the ehci-hcd driver is loaded
- load the usblp driver
- usblp doesn't recognize the device
- remove the ehci-hcd module
- usblp does recognize the device
- load the ehci-hcd module again
- usblp drops the device

Comment 1 Fred Emmott 2007-12-30 06:00:22 UTC

I should probably note that it works fine with a different printer (HP PSC 1215).

Comment 2 Anonymous Emailer 2007-12-30 15:18:05 UTC

Reply-To: akpm@linux-foundation.org

On Sun, 30 Dec 2007 05:57:27 -0800 (PST) bugme-daemon@bugzilla.kernel.org wrote:

> http://bugzilla.kernel.org/show_bug.cgi?id=9665
> 
>            Summary: ehci-hcd blocks usblp with HP CM1015 printer on NVidia
>                     680i chipset
>            Product: Drivers
>            Version: 2.5
>      KernelVersion: 2.6.24-rc6
>           Platform: All
>         OS/Version: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: normal
>           Priority: P1
>          Component: USB
>         AssignedTo: greg@kroah.com
>         ReportedBy: mail@fredemmott.co.uk
> 
> 
> Most recent kernel where this bug did not occur: not found
> Distribution: Slamd64
> Hardware Environment: SMP, EM64T (x86_64), NVidia NForce 680i chipset
> Software Environment: glibc 2.7, udev 116
> Problem Description:
> 
> usblp will neither be automatically loaded if the ehci-hcd module is present,
> or work if loaded manually, with a HP CM1015 printer. Works on another
> machine
> (Thinkpad X61s), with exact same kernel and userspace. "rmmod ehci-hcd" makes
> the usblp driver work, and after that, "modprobe ehci-hcd" makes usblp give
> up
> the device, and the lp device is destroyed. Have tried 2.6.23.1, 2.6.22.8,
> 2.6.23.12, 2.6.24-rc4 and 2.6.24-rc6.
> 
> Steps to reproduce:
> - Plug an HP CM1015 USB printer into an onboard USB port on an EVGA
> 122-CK-NF68
> board (NForce 680i) while the ehci-hcd driver is loaded
> - load the usblp driver
> - usblp doesn't recognize the device
> - remove the ehci-hcd module
> - usblp does recognize the device
> - load the ehci-hcd module again
> - usblp drops the device
> 
> 
> -- 
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Comment 3 Alan Stern 2008-02-08 08:27:35 UTC

To get more information, build a kernel with CONFIG_USB_DEBUG enabled.  Then attach the dmesg log showing what happens when you try to plug in the printer with ehci-hcd loaded.

Comment 4 Alan 2009-03-25 15:43:13 UTC

Closing out old stale bugs