Date: Thu, 10 Mar 2016 02:10:37 +0000 From: Colin Percival <cperciva@tarsnap.com> To: Ed Maste <emaste@freebsd.org>, =?UTF-8?Q?Jean-S=c3=a9bastien_P=c3=a9dron?= <dumbbell@freebsd.org> Cc: "freebsd-x11@freebsd.org" <freebsd-x11@freebsd.org> Subject: Re: i915 update to Linux 3.8 ready! Message-ID: <010001535e4a3ff9-1c85dd87-e3cc-4de4-a9a6-5c94a1d2c9ee-000000@email.amazonses.com> In-Reply-To: <CAPyFy2ATHF0L3DrvMYyRE=tB=igZdzMCBH4JOij%2BnTO84mEXug@mail.gmail.com> References: <56D9CE73.7040601@FreeBSD.org> <56DF3F20.8010208@FreeBSD.org> <CAPyFy2ATHF0L3DrvMYyRE=tB=igZdzMCBH4JOij%2BnTO84mEXug@mail.gmail.com>
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On 03/09/16 12:06, Ed Maste wrote: > On 8 March 2016 at 16:07, Jean-Sébastien Pédron <dumbbell@freebsd.org> wrote: >> The i915 update is now in HEAD as of r296548: >> https://lists.freebsd.org/pipermail/svn-src-head/2016-March/083332.html > > This is on a Thinkpad X220 (Sandy Bridge). It has a r286085 kernel > installed on the disk, and reports 11W while idle at a vt(4) console > without the driver loaded. After loading i915kms.ko but still at the > vt(4) console that increased to 14W. > > Booting from a USB stick at r296565 showed 13W initially, rising to > 25W after loading i915kms.ko. I'll continue to investigate, but would > like to know what others observe with respect to power consumption on > other laptops. On my laptop the new code significantly reduces power consumption. Laptop is a Dell Latitude E7440 with an Intel Core i5-4300U: * 7260 wifi replaced with an Atheros card; connected but idle * powerd is running with default settings * backlight brightness is at the default setting Power consumption measured as the median of 15 values from # while true; do acpiconf -i 0 | grep rate; sleep 10; done 11-CURRENT r296546 (old bits) OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 3.6, 256 bits) vt w/o i915kms.ko: 9952 mW vt w/ i915kms.ko: 9953 mW KDE idle, screen on: 11664 mW KDE idle, screen off: 6041 mW 11-CURRENT r296548 (new bits) OpenGL renderer string: Mesa DRI Intel(R) Haswell Mobile vt w/o i915kms.ko: 9958 mW vt w/ i915kms.ko: 9241 mW KDE idle, screen on: 9377 mW KDE idle, screen off: 5295 mW So basically loading the new i915kms.ko saves ~ 0.72 W in a text console; ~ 0.75 W in KDE with the screen off; and ~ 2.29 W in KDE with the screen on. -- Colin Percival Security Officer Emeritus, FreeBSD | The power to serve Founder, Tarsnap | www.tarsnap.com | Online backups for the truly paranoid
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