Bug 832188

Description of problem:

Fedora 17 with the last kernel before 3.4.0, non-display devices on a dynadock U3.0 worked just fine.  Booting from current kernel (3.4.0-1.fc17.x86_64), all subdevices are being consumed by the udl driver.

usb-devices output (the simplest way I knew to show the change in behavior)

Before:

T:  Bus=04 Lev=02 Prnt=02 Port=00 Cnt=01 Dev#=  3 Spd=5000 MxCh= 0
D:  Ver= 3.00 Cls=ef(misc ) Sub=02 Prot=01 MxPS= 9 #Cfgs=  1
P:  Vendor=17e9 ProdID=4305 Rev=00.15
S:  Manufacturer=DisplayLink
S:  Product=dynadock U3.0
S:  SerialNumber=10005287
C:  #Ifs= 7 Cfg#= 1 Atr=c0 MxPwr=2mA
I:  If#= 0 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=03 Driver=(none)
I:  If#= 1 Alt= 0 #EPs= 0 Cls=fe(app. ) Sub=01 Prot=01 Driver=(none)
I:  If#= 2 Alt= 0 #EPs= 1 Cls=01(audio) Sub=01 Prot=20 Driver=snd-usb-audio
I:  If#= 3 Alt= 0 #EPs= 0 Cls=01(audio) Sub=02 Prot=20 Driver=snd-usb-audio
I:  If#= 4 Alt= 0 #EPs= 0 Cls=01(audio) Sub=02 Prot=20 Driver=snd-usb-audio
I:  If#= 5 Alt= 0 #EPs= 1 Cls=02(commc) Sub=06 Prot=00 Driver=cdc_ether
I:  If#= 6 Alt= 1 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=cdc_ether

After:


T:  Bus=04 Lev=02 Prnt=02 Port=00 Cnt=01 Dev#=  3 Spd=5000 MxCh= 0
D:  Ver= 3.00 Cls=ef(misc ) Sub=02 Prot=01 MxPS= 9 #Cfgs=  1
P:  Vendor=17e9 ProdID=4305 Rev=00.15
S:  Manufacturer=DisplayLink
S:  Product=dynadock U3.0
S:  SerialNumber=10005287
C:  #Ifs= 7 Cfg#= 1 Atr=c0 MxPwr=2mA
I:  If#= 0 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=03 Driver=udl
I:  If#= 1 Alt= 0 #EPs= 0 Cls=fe(app. ) Sub=01 Prot=01 Driver=udl
I:  If#= 2 Alt= 0 #EPs= 1 Cls=01(audio) Sub=01 Prot=20 Driver=udl
I:  If#= 3 Alt= 0 #EPs= 0 Cls=01(audio) Sub=02 Prot=20 Driver=udl
I:  If#= 4 Alt= 0 #EPs= 0 Cls=01(audio) Sub=02 Prot=20 Driver=udl
I:  If#= 5 Alt= 0 #EPs= 1 Cls=02(commc) Sub=06 Prot=00 Driver=udl
I:  If#= 6 Alt= 1 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=udl


As a temporary workaround, I blacklisted the udl module, and network/audio have returned.  While I'm very excited at the prospect of finally having full support for the display, my primary use of the dock is for wired network and usb-hub for my Asus UX21E, and unless there's already an upstream fix in a newer kernel, or someway to have udl only grab the display-related interfaces, I'd consider udl broken, and should probably be disabled/blacklisted by default.

I'm happy to provide any additional details to help troubleshoot/fix this, and make changes to configs to get it to work... short of compiling a custom kernel.