kernel: [   16.301442] Info fld=0x2b6, ILI
kernel: [   16.301443] sr 2:0:0:0: [sr0] Add. Sense: Illegal mode for this track
kernel: [   16.336351] sr 2:0:0:0: [sr0] Result: hostbyte=DID_OK 
driverbyte=DRIVER_SENSE
kernel: [   16.336353] sr 2:0:0:0: [sr0] Sense Key : Illegal Request [current] 

This apperead in the messages log files a few times when I inserted a
USB Stick before the system freezing. As fas as I understand it, the USB
Stick was identified as a CDROM by the system. So I had the stick
inserted when accessing the BIOS because of this feature of the mobo
(hope it is not widespread) where you can specify how the usb device
should be configured. Changed the bios option from "Auto" to "Hard Disk"
and rebooted with the stick still inserted. The BIOS tried to boot from
the stick instead of the SATA  hard drive, so I removed the stick and
rebooted. Once Ubuntu was loaded I inserted the stick again and the
usual messages from echi-hcd detecting a new high speed device appeared
before the system freezing again.

-- 
System freezes after plugging in a usb flash drive
https://bugs.launchpad.net/bugs/483483
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