Just a quick report that from my completely unscientific observations it seems that battery life is extended with the latest drm import on my Thinkpad X230. I should probably get some numbers first, but my gut feeling is that it is better.
By the way on the X230 (IvyBridge i7) the loader.conf setting "drm.i915.enable_rc6=7" makes a huge difference. For some other reason I removed it from loader.conf and hw.acpi.battery.time showed 160 minutes. After re-adding it battery time went up to 230 minutes. Lars
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