Bug 10630

Summary: USB devices plugged into dock are not discoverred until reload of ehci-hcd
Product: Drivers Reporter: Rafael J. Wysocki (rjw)
Component: USBAssignee: Alan Stern (stern)
Severity: normal CC: bunk, stern, xhejtman
Priority: P1    
Hardware: All   
OS: Linux   
Kernel Version: 2.6.26-rc1 Subsystem:
Regression: Yes Bisected commit-id:
Bug Depends on:    
Bug Blocks: 10492    
Attachments: dmesg output
clean dmesg
Dmesg output
dmesg from working 2.6.25 kernel
dmesg from 2.6.26 without ehci module
My config file

Description Rafael J. Wysocki 2008-05-08 12:55:59 UTC
Subject    : 2.6.26-rc1 regression since 2.6.25
Submitter  : Lukas Hejtmanek <xhejtman@ics.muni.cz>
Date       : 2008-05-05 10:02
References : http://lkml.org/lkml/2008/5/5/77

This entry is being used for tracking a regression from 2.6.25.  Please don't
close it until the problem is fixed in the mainline.
Comment 1 Lukas Hejtmanek 2008-05-09 02:19:21 UTC
Created attachment 16078 [details]
dmesg output

in the attached dmesg, it can be seen that device is discovered after USB HW is disabled and enabled again. The device has been plugged before and I took some time to settle the device down but it still was not discovered.
Comment 2 Greg Kroah-Hartman 2008-05-09 08:18:46 UTC
You are suspending and resuming a lot.

can you just provide a clean log file, without any suspend/resume?

Just boot the box, then plug it in.
Comment 3 Lukas Hejtmanek 2008-05-12 04:02:15 UTC
Created attachment 16110 [details]
clean dmesg

Clean dmesg output. In time about 106.xx I've removed ehci_hcd and after that the usb device has been detected.
Comment 4 Lukas Hejtmanek 2008-05-19 01:48:07 UTC
Created attachment 16191 [details]
Dmesg output

Dmesg with greg usb patch.
Comment 5 Lukas Hejtmanek 2008-05-20 01:31:21 UTC
Created attachment 16211 [details]
dmesg from working 2.6.25 kernel

This is dmesg from vanila 2.6.25 kernel. The plugged device is discovered.
Comment 6 Lukas Hejtmanek 2008-05-20 01:32:14 UTC
Created attachment 16212 [details]
dmesg from 2.6.26 without ehci module

This is dmesg from 2.6.26 kernel without an ehci module. uhci module discovers the device.
Comment 7 Lukas Hejtmanek 2008-05-20 04:16:25 UTC
Created attachment 16214 [details]
My config file

My config file
Comment 8 Rafael J. Wysocki 2008-05-20 15:24:22 UTC
Regressions list annotation:
References : http://lkml.org/lkml/2008/5/19/44
Handled-By : Oliver Neukum <oliver@neukum.org>
Handled-By : Alan Stern <stern@rowland.harvard.edu>
Patch : http://lkml.org/lkml/2008/5/20/285
Comment 9 Rafael J. Wysocki 2008-05-31 11:29:53 UTC
Fixed by commit d1f114d12bb4db3147e1b1342ae31083c5a79c84.