pcbsd9-stable-20120505 snapshot - howto enable intel rc6

Kevin Oberman kob6558 at gmail.com
Sat May 19 03:34:35 UTC 2012

On Fri, May 18, 2012 at 1:02 PM,  <user10508 at gmail.com> wrote:
> Kevin Oberman@
> Thank you for your suggestion.
> hint.acpi_throttle.0.disabled=1 was in /boot/loader.conf, I added
> hint.p4tcc.0.disabled=1 and rebooted. Unfortunately, these changes to
> /boot/loader.conf had no effect on the thermal or battery life problems I've
> been experiencing.
> Konstantin Belousov@
> Thank you for your suggestion. It reminded me that I neglected to report
> that screen artifacts appeared as system temperature increased. No surprise
> about that right? Initially few in number and small in area, over time, the
> number of artifacts and the size of affected areas increased. Redraws,
> manual or application related, removed the artifact.
> In researching the problems I've been experiencing, I found comments about
> initial releases of intel's X driver on linux. Early software had poor
> battery life and thermal problems on laptops.
> So far so good. To me this means that there is nothing unusual about the
> initial freebsd release of kms support for the intel sandybridge IGA.
> I installed linux-mint debian eddition which was released just a few days
> ago. This release of linux uses a linux 3.2 kernel and for X,
> intel-2.18.0-1.
> This combination results in normal battery life and no thermal problems.
> Given the close relationship between linux kernel changes and intel driver
> changes, it may be premature to assume that just using X intel-2.18.0 on a
> freebsd stable kernel will solve everything.
> On a well ventilated server, I think this initial release of kms support may
> be good to go.
> For laptops, I don't think its quite there yet.
> I'm going to wait for RC6 functionality to percolate into X for Intel. When
> its ready, I'm confident it will solve the problems I've been experiencing.

FWIW, I am running on a laptop with Intel-KMS driver with none of the
power or thermal issues you are having. ThinkPad T520 Sandybridge. My
cores are currently at 51 and 55 degrees with a load average of about
.5, so pretty calm. Something is different in your system that is
triggering the problem. I just don't know about hardware or software.
R. Kevin Oberman, Network Engineer
E-mail: kob6558 at gmail.com

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