Miguel, you'll need to provide more information.

1. Are any USB devices connected during power-up?
2. Create a series of reports:

sudo -i
mkdir /tmp/report
uname -a >/tmp/report/system.log
lsb_release -a >>/tmp/report/system.log
lspci -vvnn >/tmp/report/lspci-vvnn.log
lsub -v >/tmp/report/lsusb-v.log
dmidecode >/tmp/report/dmidecode.log
exit

3.  Create a single archive containing the reports and attach it to this
bug

tar -czf /tmp/report.logs.tar.gz  /tmp/report/*  /var/log/dmesg
/var/log/kern.log

-- 
warning: ehci_hcd loaded AFTER uhci_hcd and ohci_hcd
https://bugs.launchpad.net/bugs/296710
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