Date: Thu, 17 Mar 2016 11:20:13 -0400 From: Ed Maste <emaste@freebsd.org> To: am_dxer@fastmail.fm Cc: Konstantin Belousov <kostikbel@gmail.com>, "freebsd-x11@freebsd.org" <freebsd-x11@freebsd.org> Subject: Re: i915 update to Linux 3.8 ready! Message-ID: <CAPyFy2BBa_RdS-5vz9y1vgOoAfe9PzWKvMpg0%2BK7i9uqJ%2Bo4Qg@mail.gmail.com> In-Reply-To: <1458086366.4068324.550308746.4DBF0576@webmail.messagingengine.com> References: <1457974114.3576662.548762770.0E1628BF@webmail.messagingengine.com> <CAPyFy2C-oPqrrWTvx_CsMN6EX-kG-HmWJELUAw1Zp5hO9h6XSg@mail.gmail.com> <20160315171920.GZ1741@kib.kiev.ua> <1458086366.4068324.550308746.4DBF0576@webmail.messagingengine.com>
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On 15 March 2016 at 19:59, <am_dxer@fastmail.fm> wrote: > > Thank you both for the suggestions. After suspending and resuming the > machine, I find that the power used by the GPU is significantly less. Thank you for testing, and I see the same behaviour on my Thinkpad X220: after loading i915kms.ko only RC6 is nonzero and RC6+ and RC6++ remain at zero, while after boot RC6++ is much higher. I noticed one other interesting point: before suspending RC6 residency is high but unchanging, while after suspending RC6++ continually increases. As I noted on this mailing list a little while ago there have been some commits in Linux that seem to be related, although they were for the case of increased power consumption _after_ suspend. (The two commits are in code review at https://reviews.freebsd.org/D5599). I'll continue investigating.
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