Deep sleep modes on 7-BETA locks up syscons

[Simon Barner]

Kevin Oberman wrote:
> I have already sent much of this to -current@, but ACPI is clearly
> involved and I'll admit that I don't fully understand all of the
> implications of sleep (Cx) states.
> 
> Recently I discovered that I could no longer boot up on battery. (As it
> turned out, I could not shut down, either.) The boot proceeds to devd
> which kicks off power_profile which resets the cx_state. I use
> performance_cx_lowest="HIGH" and economy_cx_lowest="LOW" which drops
> cx_state to C4 when on battery. 
> 
> States of C1 and C2 don't cause a problem and C3 and C4 do. (C4 is only
> available when on battery.)
> 
> At that point things slow to a crawl. I have never had the patience to
> see if it would ever finish the boot, but it took many minutes just to
> start ipfw and load the rules. When anything made it to the screen, it
> appeared several lines at a time.

As reported on -current, I used to have this problem, but it seems to
have been fixed with the latest BIOS update (T61):

Before the BIOS update, C3 caused similar lock ups in syscons when
running on battery (it did work in X). When on AC, there has never been
any problem.

I made available some information (dmesg, kernel config, acpi dump,
dev.cpu and hw.acpi sysctls) in the hope the provide something usefull.

http://people.freebsd.org/~barner/cx/

-- 
Best regards / Viele Grüße,                             barner at FreeBSD.org
 Simon Barner                                                barner at gmx.de
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