[SOLVED] No ACPI support in kernel

w1k0 · 07-08-2011, 02:20 PM

I use Slackware 13.37 32-bit version on ThinkPad X60s. I compiled two Window Maker dockable applications monitoring the processor temperature, fan speed, and battery status: wmpower (see: http://www.dockapps.org/file.php/id/164) and wmlenovo (see: http://www.dockapps.org/file.php/id/347).

Both these applications refuse to work.

wmpower displays the messages:

Code:

CPU frequency scaling available
No power management subsystem detected

No power management support...

wmlenovo displays the message:

Code:

No ACPI support in kernel

Did I missed something obvious during the configuration of the system and ACPI doesn’t work for me or there’s some more serious problem with my system?

disturbed1 · 07-08-2011, 02:59 PM

How old is the bios of your Thinkpad? There's a cut off year (2000 or 2001) which will not enable acpi support. You can boot with acpi=force to enable acpi support for older bios's.

I have to do this for an old Dell Inspiron 3000, and Compaq m700.

They did also change the way sensors work in the kernel, if the above does not work, try booting with acpi_enforce_resources=lax after reading http://www.lm-sensors.org/wiki/FAQ/C...inkernel2.6.31

Woodsman · 07-08-2011, 03:34 PM

I think the acpi=force option is sufficient. If you want to roll a new kernel, then in the stock Slackware the kernel is configured with the following in Power management and ACPI options:

CONFIG_ACPI_BLACKLIST_YEAR=2001

That can be overridden with:

CONFIG_ACPI_BLACKLIST_YEAR=0

Occasionally I tinker with a PII using a 1998 BIOS. The PSU and BIOS support ACPI. I roll my own kernels and changed that option.

Quote:

They did also change the way sensors work in the kernel, if the above does not work, try booting with acpi_enforce_resources=lax after reading http://www.lm-sensors.org/wiki/FAQ/C...inkernel2.6.31

I use that boot option too. One day I'll reconfigure lmsensors correctly to avoid that parameter. . . .

w1k0 · 07-08-2011, 07:07 PM

My ThinkPad was produced in 2007 or 2008. When I installed on it Slackware 13.1 I updated BIOS to the version 2.18 released 2009-01-08. The mentioned above wmpower program worked well with Slackware 13.1 but refuses to work with Slackware 13.37. After the installation of Slackware 13.37 I read CHANGES_AND_HINTS.TXT. So I knew about acpi=force switch but I ignored that information because the machine and the BIOS are relatively new. Now I tried that switch but results are the same – wmpower and wmlenovo refuse to work. I didn’t mention in the first post that /proc/acpi directory in my Slackware 13.37 seems to look well.

w1k0 · 07-08-2011, 08:12 PM

I solved the problem. Both wmpower and wmlenovo seek for /proc/acpi/info file in oder to test if ACPI is enabled. Unfortunately modern kernels – newer than 2.6.35 – don’t use such file. In result the mentioned programs refuse to work. It was enough to edit in wmpower sources the file src/power_management/acpi/libacpi.c and in wmlenovo sources the file src/main.c replacing /proc/acpi/info file name with /proc/acpi/wakeup file name and compile and install the modified sources. Now both wmpower and wmlenovo work well on my machine.