PROBLEM: unable to enumerate USB device on port 6

[Franco Gastón Pellegrini]

Kernel version: 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:24
UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

hi,
I have an ACER 5520, with ubuntu 11.04 and all my TTY repeats
indefinitly (every 1/3 seconds) the mesages:

.....
May 1 18:34:27 franco-Aspire-5520 kernel: [ 888.350128] hub 1-0:1.0:
unable to enumerate USB device on port 6
May 1 18:34:27 franco-Aspire-5520 kernel: [ 888.610230] hub 3-0:1.0:
unable to enumerate USB device on port 6
May 1 18:34:27 franco-Aspire-5520 kernel: [ 888.890098] hub 1-0:1.0:
unable to enumerate USB device on port 6
May 1 18:34:28 franco-Aspire-5520 kernel: [ 889.150111] hub 3-0:1.0:
unable to enumerate USB device on port 6
....

i cant use any TTY, how can i fix it? any kernel before do this for me.

PD: what info do you need to complete my report?

Excuse my english
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