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[Bug 1262797] Re: acer-wmi module hangs laptop for 10 seconds on boot/modprobe


I tested with 
- v3.13-rc3: modprobing acer-wmi after boot results in same hang/10s wait
- latest daily: daily/2013-12-19-trusty : same issue.

** Tags added: kernel-bug-exists-upstream

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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  acer-wmi module hangs laptop for 10 seconds on boot/modprobe

Status in “linux” package in Ubuntu:

Bug description:
  I have a Acer Aspire 7740, and noticed after installing that Ubuntu 13.10 (kernel 3.11.0-14) hangs for 10 seconds early in the boot process. It continues after that. 
  The screen freezes and the fans start spinning very hard. 
  The last dmesg line before the pause is a info message about acer-wmi.

  I blacklisted acer-wmi in /etc/modprobe.d/blacklist.conf and updated
  initramfs. Now ubuntu boots as it should without hanging. No
  functionality appears to be lost. Bluetooth and wifi work, also the
  volume keys.

  When modprobing this module after boot the same symptoms occur. Ubuntu
  hangs, and reacts normally after 10 seconds.

  So, clearly something is wrong with acer-wmi. Maybe it should not be
  loaded with this laptop version, or it has a bug in it.

  I will add a dmesg from a boot with acer-wmi enabled.

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