I have set up nvidia's PowerMizer to use different profiles on mains and battery power as documented at http://tutanhamon.com.a/technovodstvo/NVIDIA-UNIX-driver/ , however according to nvidia-settings the laptop is always on mains power, even when it's actually running off the battery:
$ nvidia-settings -q GPUPowerSource -t 0
I noticed that OpenSUSE running on the same laptop detects the power source correctly, so might this have something to do withpackaging? Looks like I have 260.19.44 installed on openSUSE and 270.41.19 on this debian system.
If this is still a problem, check that acpid is running! Look in Xorg.0.log - the driver reports whether it was able to connect to acpid successfully or not. That was my problem...
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