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SubjectUSB problem, bug since 2.4.2-ac5
In ac5 the USB or related changes broke things for this system I 
upgraded, this bug still exists in ac11.

I get the following messages on the order of about 50/second.

usb-uhci.c: interrupt, status 20, frame# 0
usb-uhci.c: interrupt, status 30, frame# 0

They repeat forever evenly, 20-30-20-30..

Alan's announcment for -ac5 has listed in it:

Fix USB thread wakeup scheduling(Arjan van de Ven)

00:04.2 USB Controller: Intel Corporation 82371AB PIIX4 USB (rev 01)
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 32 set
Interrupt: pin D routed to IRQ 9
Region 4: I/O ports at b400 [size=32]

The only USB device I have plugged in atm is:

input0: USB HID v1.00 Mouse [Logitech USB-PS/2 Mouse] on usb1:2.0

/proc/bus/usb has:

# cat devices
T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2
B: Alloc=118/900 us (13%), #Int= 1, #Iso= 0
D: Ver= 1.00 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=0000 ProdID=0000 Rev= 0.00
S: Product=USB UHCI Root Hub
S: SerialNumber=b400
C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=255ms
T: Bus=01 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#= 2 Spd=1.5 MxCh= 0
D: Ver= 1.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=046d ProdID=c001 Rev= 1.10
S: Manufacturer=Logitech
S: Product=USB-PS/2 Mouse
C:* #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr= 50mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=01 Prot=02 Driver=hid
E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl= 10ms

# cat drivers
cpia
usbdevfs
hub
hid
48- 63: usbscanner
acm
0- 15: usblp
audio
80- 95: dc2xx
ov511
dsbr100
bluetooth
pegasus
usb-storage

-d

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