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 http://ubuntuforums.org/showthread.p...63#post9266363
But it has not made a difference.
My wireless card is Ralink RT2561/RT61 rev B 802.11g
Using Comments #50 and #54 from https://bugs.launchpad.net/ubuntu/+s...ux/+bug/656745 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
and pasted in this command
sudo cp pcie_aspm /etc/pm/power.d
Once this had been done I pulled out the power lead and found my laptop no longer crashed.
sudo cp wireless /etc/pm/power.d
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 https://bugs.launchpad.net/ubuntu/+s...ux/+bug/666852
and here https://bugs.launchpad.net/ubuntu/+bug/669044
Last edited by JosephWheatley; January 29th, 2011 at 07:27 PM.
Reason: Added links to reported bugreports and added solution
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