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[Iván Matellanes <1455974@xxxxxxxxxxxxxxxxxx>]

Hi, I'm having the same issue on a Lenovo G510.
A workaround (at least for me) is to disable NetworkManager quickly after booting, then it won't freeze.
After that, remove bcmwl-kernel-source and the problem won't happen with brcmsmac, I can re-enable NetworkManager safely.

Hardware:
08:00.0 Network controller: Broadcom Corporation BCM4313 802.11bgn Wireless Network Adapter (rev 01)

Notice bug 1451789, which looks very similar.

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https://bugs.launchpad.net/bugs/1455974

Title:
  Lenovo E545 freezes with 'CPU stuck' under Kernel 3.19 (Ubuntu 15.04)

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Lenovo E545 freezes with 'CPU stuck' under Kernel 3.19 (Ubuntu 15.04;
  latest) after aprox 10s when login screen appears meanwhile Ubuntu
  14.10 runs.

  CPU stuck also when booting in text mode.

  Kernel 3.16 under Ubuntu 15.04 seems to work either.

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