On 04.02.2015 21:27, Lars Engels wrote:
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.


I've been using the same setting for a while now and can confirm the increase of battery life. It also makes a huge difference in fan noise on my T420.

Can you suspend/resume with rc6 on? I had to patch around a deadlock in i915_irq.c: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=183859
I haven't checked yet if this still occurs after the recent drm import.
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