acpi_video, 5.3-RELEASE, ThinkPad X31?

[Kevin Oberman]

> From: Brad Karp <bkarp+ at cs.cmu.edu>
> Date: Wed, 17 Nov 2004 15:08:15 -0500
> Sender: owner-freebsd-mobile at freebsd.org
> 
> Greetings, all.
> 
> I run 5.3-RELEASE on a ThinkPad X31. Using ACPI, with acpi_video loaded at 
> boot time (as verified by kldstat), I find no dmesg output for the acpi_video 
> driver; it would seem the driver cannot attach on the X31.
> 
> I believe I need acpi_video so that my backlight turns off when I suspend; at 
> present, when I transition to state S3, the machine suspends successfully (no 
> disk noise; "moon" icon illuminated), and while the image on the display is 
> blanked, the power-hungry backlight remains on.
> 
> Has anyone with an X31 (or other ThinkPad) found a fix or workaround?

On my T30 I needed to add jhb's acpi_video_dpms patch and put:
hw.acpi.reset_video=0
hw.syscons.no_suspend_vtyswitch=1
hw.pci.do_powerstate=1
into /etc/sysctl.conf

That is the only way I found to get the backlight to turn off. (I do
have acpi_video loaded, but it only seems to report on the video. I
can't sert anything.)
-- 
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman at es.net			Phone: +1 510 486-8634