Date: Thu, 10 Mar 2016 11:23:02 -0500 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: <CAPyFy2DyHeQT2kwEKidDuAzSxpZsnGq%2BJuk0aJ9zzddF0ACG2Q@mail.gmail.com> In-Reply-To: <CAPyFy2AOgGOeF-H7c10tVY3hDbq3jJCXF1WvnoDVEGQk=zvF5Q@mail.gmail.com> References: <56D9CE73.7040601@FreeBSD.org> <56DF3F20.8010208@FreeBSD.org> <CAPyFy2ATHF0L3DrvMYyRE=tB=igZdzMCBH4JOij%2BnTO84mEXug@mail.gmail.com> <CAPyFy2AOgGOeF-H7c10tVY3hDbq3jJCXF1WvnoDVEGQk=zvF5Q@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On 9 March 2016 at 22:02, Ed Maste <emaste@freebsd.org> wrote: > > 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. Some further testing suggests the power consumption's back to normal after a suspend+resume cycle, without the patch in D5599. I may have mixed up something in my experiment yesterday or perhaps there's some intermittent behaviour. If anyone else has Sandy Bridge laptops (Thinkpad X220, T420 etc.) I'd really appreciate hearing about test results.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?CAPyFy2DyHeQT2kwEKidDuAzSxpZsnGq%2BJuk0aJ9zzddF0ACG2Q>