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I have a Microsoft Bluetooth Notebook Mouse 5000 and have experienced the same problem with two laptops, a Sony Vaio Z, and now a Lenovo Thinkpad T420s:

I can pair the bluetooth device to the computer, and it works fine until I either reboot, or put the laptop to sleep (either full hibernate, or just close the lid for a while).

In both cases the mouse will auto power off after a while. When I turn the mouse back on, though, the only way to use it again is to open the KDE Bluetooth device manager, remove the existing device, and re-detect and add it again.

I have 'trusted' the mouse in the bluetooth device manager.

I'm using Debian squeeze, with kernel 3.2.0 from backports.

My google searches have found many people with similar or identical problems, but no solution.

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Hi @Flimzy, did you find a proper fix for this by now? – king_julien Mar 12 '14 at 13:48
    
I had this problem a while, then it was gone for several months and now (probably after some update) it started again (Debian 3.14 x64 jessy, KDE) – zoechi Aug 1 '14 at 12:29
    
After some additional updates it works better than anytime before - sometimes I need to disable/enable bluetooth to make it work, but most of the time it just works. – zoechi Aug 17 '14 at 14:01

Have you tried to restart the bluetooth service with:

sudo systemctl restart bluetooth.service after wake-up? If that works you can trigger restart with something like this:

http://askubuntu.com/questions/308067/how-to-run-a-script-after-or-before-hibernate

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