amd64/171355: FreeBSD 9.1rc1 (and 10-HEAD) not booting on HP Pavilion g6 2147sl

[Stefano Marinelli]

The following reply was made to PR amd64/171355; it has been noted by GNATS.

From: Stefano Marinelli <stefano at dragas.it>
To: Alexander Motin <mav at FreeBSD.org>
Cc: attilio at freebsd.org,
 bug-followup at FreeBSD.org,
 John Baldwin <jhb at freebsd.org>,
 re at FreeBSD.org
Subject: Re: amd64/171355: FreeBSD 9.1rc1 (and 10-HEAD) not booting on HP Pavilion g6 2147sl
Date: Sun, 9 Sep 2012 22:03:24 +0200

 > Thanks, that explains a lot. AMD started to use their proper vendor ID =
 for HPET, but seems haven't fixed level-triggered interrupts and haven't =
 implemented (removed?) message interrupts. All together it broke =
 workaround in HPET driver that supposed to block HPET by default in such =
 cases. Such patch should restore it:
 [...]
 
 Thank you. I am downloading the sources and will try to patch and =
 recompile the kernel as soon as it will have finished. Then, I will =
 report back.
 
 > I can't say about frequency control, never looked inside AMD's =
 PowerNow; but C-states are detected as I can see. You should just enable =
 them by adding to /etc/rc.conf lines:
 > performance_cx_lowest=3D"C2"
 > economy_cx_lowest=3D"C2"
 
 I tried this, and actually I can see the C2 status is now active. Still, =
 the watt-o-meter I am using shows a 50W power consumption in idle state =
 (wifi is off as unsupported), compared to 23/24 on GNU/Linux (Arch) with =
 wifi on.
 
 Thank you,
 Stefano=