Comment 5 for bug 1194761

Further investigated on those system that equipped with Microdia [0c45:648d]
Here's the result and output from usb-devices (some repeated message truncated, please find attachment for full log):

201208-11538 Dell Inspiron 3521 - 13.04 Raring (3.8.0-19) : No Problem
T: Bus=01 Lev=02 Prnt=02 Port=03 Cnt=03 Dev#= 5 Spd=480 MxCh= 0
P: Vendor=0c45 ProdID=648d Rev=22.06
S: Manufacturer=CNFB194I2450100017G2
S: Product=Laptop_Integrated_Webcam_HD

201208-11539 Dell Inspiron 3521 - 12.04.2 Precise (3.5.0-34) : No Problem
T: Bus=01 Lev=02 Prnt=02 Port=03 Cnt=03 Dev#= 5 Spd=480 MxCh= 0
P: Vendor=0c45 ProdID=648d Rev=22.06
S: Manufacturer=CNFB194I2450100017C2
S: Product=Laptop_Integrated_Webcam_HD

201208-11540 Dell Inspiron 5521 - 12.04.2 Precise (3.5.0-32) : No Problem
T: Bus=01 Lev=02 Prnt=02 Port=03 Cnt=03 Dev#= 5 Spd=480 MxCh= 0
P: Vendor=0c45 ProdID=648d Rev=22.06
S: Manufacturer=CNFB194I123010000QH2
S: Product=Laptop_Integrated_Webcam_HD

201209-11715 Inspiron 5421 - 13.10 Saucy (3.9.0-7) : No Problem
T: Bus=01 Lev=02 Prnt=02 Port=05 Cnt=03 Dev#= 5 Spd=480 MxCh= 0
P: Vendor=0c45 ProdID=648d Rev=27.23
S: Manufacturer=1234567890-14P
S: Product=Laptop_Integrated_Webcam_HD

201202-10404 Inspiron 5720 - 12.04.2 Precise (3.2.0-48) : Same issue, "-v" tweak works too.
T: Bus=01 Lev=02 Prnt=02 Port=04 Cnt=02 Dev#= 4 Spd=480 MxCh= 0
P: Vendor=0c45 ProdID=648d Rev=1c.07
S: Manufacturer=1234567890-17V
S: Product=Laptop_Integrated_Webcam_HD

And usb-devices output from 201203-10664:
T: Bus=01 Lev=02 Prnt=02 Port=04 Cnt=02 Dev#= 4 Spd=480 MxCh= 0
P: Vendor=0c45 ProdID=648d Rev=1c.07
S: Manufacturer=1234567890-17W
S: Product=Laptop_Integrated_Webcam_HD

Verified with the same script that was used in 201203-10664

It looks like the Rev of this device has something to do with this issue.