Date: Thu, 14 Nov 2013 14:41:44 -0800 From: Adrian Chadd <adrian@freebsd.org> To: Jung-uk Kim <jkim@freebsd.org>, "freebsd-acpi@freebsd.org" <freebsd-acpi@freebsd.org>, njl@freebsd.org Subject: P-state setting suddenly disappeared, what gives? Message-ID: <CAJ-Vmom9tT2yvJu9D5R=Uyg47TKGX9mkP8M2My8XQZFezdjiyA@mail.gmail.com>
next in thread | raw e-mail | index | archive | help
Hi all, I have this Lenovo T400 that I've been doing FreeBSD development on for a while. It has a P8700 in it: CPU: Intel(R) Core(TM)2 Duo CPU P8700 @ 2.53GHz (2527.07-MHz 686-class CPU) Now, up until yesterday, ACPI exported the required twiddles to enter various different P-states. However, as of sometime yesterday, it stopped being able to do so. sysctl dev.cpu.0.freq returns nothing. Setting it to something retuns "device not configured." The frequency list (ie, the P-state list) is still fine. I had to load cpufreq.ko to get the enhanced speedstep stuff to show up, but (a) it doesn't support this CPU (and it seems to have stopped growing EST bits after Pentium M CPUs..) and (b) setting the frequency using it versus P-state settings doesn't save as much power. I'd like to try and debug why the heck this is. The laptop still works fine, things are just not as "nice" as they once were. Any ideas? Any suggestions on where to start debugging this? Thanks! -adrian
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?CAJ-Vmom9tT2yvJu9D5R=Uyg47TKGX9mkP8M2My8XQZFezdjiyA>