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Thread: Laptop freezes to black screen when AC power lead removed

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  1. #1
    Join Date
    Jan 2010
    Lubuntu 12.04 Precise Pangolin

    Laptop freezes to black screen when AC power lead removed

    Got a clean install of Ubuntu 10.10 Maverick with all updates on installation.

    I simply pull out the power lead on my Packard Bell MZ35 laptop and as the black popup notification appears telling me about my battery status the screen goes blank with a frozen cursor.
    The same happens if I start up on battery. There is no problem until the moment that the wireless connects again and the black pop-up notification appears I get the same black screen with frozen mouse cursor.

    I have to resort to a hard restart each time.

    Everything works fine plugged in i.e. LAN is wired and power is plugged in.

    Tried the advice here
    But it has not made a difference.

    My wireless card is Ralink RT2561/RT61 rev B 802.11g

    Using Comments #50 and #54 from I did the following to prevent the freezes on my Packard Bell MZ35

    I created an empty file by right clicking on the desktop and choosing "Create Document" and then "Empty File"
    Then I gave the file the name


    I repeated this to create another empty file called


    The two files were be copied to the folder /etc/pm/power.d

    I started the terminal with the command ctrl-alt-T
    navigated to the Desktop folder with

    cd Desktop
    and pasted in this command

    sudo cp pcie_aspm /etc/pm/power.d
    followed by
    sudo cp wireless /etc/pm/power.d
    Once this had been done I pulled out the power lead and found my laptop no longer crashed.
    I think a restart is necessary as within an hour my computer performed a bizarre reboot that must have been caused by confusing the pm-utils
    I have had no such crashes since.

    It has been reported here
    and here

    Last edited by JosephWheatley; January 29th, 2011 at 07:27 PM. Reason: Added links to reported bugreports and added solution
    Lubuntu 12.04 on Packard Bell BV EasyNote MZ35
    Debian 7.1 Wheezy on Asus EEE PC 1000h

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