Wireless keyboard & mouse

[LeFrettchen]

I bought a wireless set for my thinkpad W500, but it has an odd behavior.

It works fine with Windows and KDE, but only works 2 or 3 minutes with XFCE before hanging.

Hardware : Microsoft Wireless Keyboard 800 and Microsoft Wireless Mouse 1000.
Seems to be ok with dmesg...

uhidev0 at uhub8 port 4 configuration 1 interface 0 "Microsoft Microsoft\M-. 2.4GHz Transceiver v8.0" rev 2.00/6.56 addr 3
uhidev0: iclass 3/1
ukbd0 at uhidev0: 8 variable keys, 6 key codes
wskbd1 at ukbd0 mux 1
uhidev1 at uhub8 port 4 configuration 1 interface 1 "Microsoft Microsoft\M-. 2.4GHz Transceiver v8.0" rev 2.00/6.56 addr 3
uhidev1: iclass 3/1, 28 report ids
uhid0 at uhidev1 reportid 18: input=0, output=0, feature=1
uhid1 at uhidev1 reportid 22: input=4, output=0, feature=0
uhid2 at uhidev1 reportid 23: input=0, output=0, feature=1
ums0 at uhidev1 reportid 26: 5 buttons, Z dir
wsmouse2 at ums0 mux 0
uhid3 at uhidev1 reportid 28: input=3, output=0, feature=0
uhidev2 at uhub8 port 4 configuration 1 interface 2 "Microsoft Microsoft\M-. 2.4GHz Transceiver v8.0" rev 2.00/6.56 addr 3
uhidev2: iclass 3/0, 8 report ids
uhid4 at uhidev2 reportid 3: input=1, output=0, feature=0
uhid5 at uhidev2 reportid 4: input=1, output=0, feature=0
uhid6 at uhidev2 reportid 7: input=7, output=0, feature=0
uhid7 at uhidev2 reportid 8: input=1, output=0, feature=0