Date: Mon, 14 Mar 2016 12:48:34 -0400 From: am_dxer@fastmail.fm To: freebsd-x11@FreeBSD.org Subject: i915 update to Linux 3.8 ready! Message-ID: <1457974114.3576662.548762770.0E1628BF@webmail.messagingengine.com>
next in thread | raw e-mail | index | archive | help
On 9 March 2016 at 22:02, Ed Maste <emaste at 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. On an HP EliteBook 2560p with the Sandy Bridge Core i7-2620M processor, I have about a 5 watt power increase when loading the KMS driver from head as opposed to when using vesa. I have enabled the rc6 states in loader.conf and dmesg output shows them as being enabled. I am testing from within the Mate Desktop environment. Doing any tests on consoles as you have done is a bit challenging for me because I am totally blind and use a screen reader called Orca that only works within a graphical environment.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?1457974114.3576662.548762770.0E1628BF>