[Bug 614180] [NEW] ehci fails but ohci does not initiate

Fri Aug 6 03:56:10 UTC 2010

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ehci_hcd fails to fall back to ohci if USB 2.0 port is NOT working
(i.e. hardware USB 2.0 is not working or is defective)... if ehci
fails to initiate, it does not fall back to ohci

USB 2.0 port of laptop not functioning.... ehci_hcd fails... doesn't
fall back to ohci... usb 1.1 devices work (e.g. mouse)

Hardware:  Thinkpad T41, FireGL Radeon Mobility 9000 (RV250), 2 USB ports - USB 2.0 (Southbridge issue)
This was tested in Ubuntu and Lubuntu 10.04 (same result/outcome):

$ lsusb
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 002: ID 062a:0000 Creative Labs Optical mouse
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

$ dmesg | tail
[  492.360449] hub 1-0:1.0: unable to enumerate USB device on port 4
[  492.548420] hub 1-0:1.0: unable to enumerate USB device on port 4
[  492.736393] hub 1-0:1.0: unable to enumerate USB device on port 4
[  492.924366] hub 1-0:1.0: unable to enumerate USB device on port 4
[  493.112335] hub 1-0:1.0: unable to enumerate USB device on port 4
[  493.300432] hub 1-0:1.0: unable to enumerate USB device on port 4
[  493.488406] hub 1-0:1.0: unable to enumerate USB device on port 4
[  493.610605] end_request: I/O error, dev fd0, sector 0
[  493.610621] Buffer I/O error on device fd0, logical block 0
[  493.732089] usb 1-4: new high speed USB device using ehci_hcd and address 64

$ dmesg | grep usb
[    4.348048] usb 1-4: new high speed USB device using ehci_hcd and address 17
[    5.600043] usb 1-4: new high speed USB device using ehci_hcd and address 23
[   11.304988] usb 1-4: new high speed USB device using ehci_hcd and address 26
[   11.860401] usb 1-4: new high speed USB device using ehci_hcd and address 28
[   13.488058] usb 1-4: new high speed USB device using ehci_hcd and address 36
[   13.800141] usb 1-4: new high speed USB device using ehci_hcd and address 37
[   15.056100] usb 1-4: new high speed USB device using ehci_hcd and address 43
[   16.308036] usb 1-4: new high speed USB device using ehci_hcd and address 49
[   18.500045] usb 1-4: new high speed USB device using ehci_hcd and address 60
[   19.376043] usb 1-4: new high speed USB device using ehci_hcd and address 64
[   19.876063] usb 1-4: new high speed USB device using ehci_hcd and address 66
[   21.504071] usb 1-4: new high speed USB device using ehci_hcd and address 74
[   22.380061] usb 1-4: new high speed USB device using ehci_hcd and address 78

ETC.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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ehci fails but ohci does not initiate
https://bugs.edge.launchpad.net/bugs/614180
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