Vincent Ouwehand, this bug report is being closed due to your last
comment
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1305452/comments/4
regarding this being fixed with an update. For future reference you can
manage the status of your own bugs by clicking on the current status in
the yell
After updates in Kubuntu on April 11th i have not had the popup messages
anymore. I did do the update to the new bios/firmware just in case. Will
be hard to confirm this was the cause.
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ht