Date: Wed, 07 Oct 2015 23:18:38 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 202651] cpufreq no longer works in 10.2 on Intel D525MWV Message-ID: <bug-202651-8-MdkWCiOwow@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-202651-8@https.bugs.freebsd.org/bugzilla/> References: <bug-202651-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=202651 --- Comment #1 from Viktor Štujber <viktor.stujber@gmail.com> --- After failing to find the regression window and discovering that the previous kernel with the new userland also exhibits the problem, I again tried searching for existing discussions about the subject. I found https://lists.freebsd.org/pipermail/freebsd-stable/2015-March/082034.html from march 2015 which points to a 1 year old change in HEAD, https://svnweb.freebsd.org/base?view=revision&revision=265329 . Here the committer references some other mailing list discussion, which concluded that P-state power management is not effective and can interfere with C-state power management. That is nice and all, but this Intel Atom CPU does not have any C-state power management. Using P-states has a measurable impact (a few watts). Undoing the changes to /boot/device.hints is what I did for now. -- You are receiving this mail because: You are the assignee for the bug.help
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