Battery life with the latest drm

[Lars Engels]

On Thu, Feb 05, 2015 at 09:22:49PM +0100, Jan Kokemüller wrote:
> 
> 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.

Yes, I can suspend and resume several times. I haven't seen a broken s/r
cycle since the latest drm import.
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