Date: Thu, 10 Mar 2016 03:02:58 +0000 From: Ed Maste <emaste@freebsd.org> To: =?UTF-8?B?SmVhbi1Tw6liYXN0aWVuIFDDqWRyb24=?= <dumbbell@freebsd.org> Cc: "freebsd-x11@freebsd.org" <freebsd-x11@freebsd.org> Subject: Re: i915 update to Linux 3.8 ready! Message-ID: <CAPyFy2AOgGOeF-H7c10tVY3hDbq3jJCXF1WvnoDVEGQk=zvF5Q@mail.gmail.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>
next in thread | previous in thread | raw e-mail | index | archive | help
On 9 March 2016 at 20:06, Ed Maste <emaste@freebsd.org> wrote: > On 8 March 2016 at 16:07, Jean-S=C3=A9bastien P=C3=A9dron <dumbbell@freeb= sd.org> wrote: >> Hi! >> >> The i915 update is now in HEAD as of r296548: >> https://lists.freebsd.org/pipermail/svn-src-head/2016-March/083332.html > > Thank you very much Jean-S=C3=A9bastien for bringing this to completion! > > I've now updated my regular laptops to HEAD after this commit and have > discovered that the power consumption seems to have increased > significantly. I found reports that Linux introduced a regression on Sandy Bridge power consumption sometime around Linux 3.6 that was fixed after 3.8. Those reports are specifically for an increase after a suspend-resume cycle; something gets confused and causes the GPU to never enter rc6. It's not exactly the same symptom, as I see increased consumption after reboot and loading i915 (before starting X), but certainly seems related. Anyhow, with that patch applied after a suspend-resume cycle I'm back to a reasonable power consumption -- around 15W in X with Firefox running. The patch is in https://reviews.freebsd.org/D5599.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?CAPyFy2AOgGOeF-H7c10tVY3hDbq3jJCXF1WvnoDVEGQk=zvF5Q>