IBM T42 freezes when going to sleep under X11

[Kevin Oberman]

> Date: Mon, 14 Nov 2005 17:50:31 +0900 (JST)
> From: Jacques Garrigue <garrigue at math.nagoya-u.ac.jp>
> Sender: owner-freebsd-mobile at freebsd.org
> 
> I've got a strange problem with my IBM T42 / Radeon M10 setup.
> 
> When using the 6.0-RELEASE kernel (including GENERIC), I cannot go to
> sleep when X11 is running: the machine freezes, display still on. I
> tried disabling DRI, but this does not seem to be the problem: I have
> no DRM anyway.
> 
> On the other hand, everything works fines with a 6.0-RC1 kernel.
> Was there a big change in between, such that I need to change my
> configuration?
> 
> I can give more information if it helps.

First, you really want to install and use radeontool. It can properly
turn off the Radeon display, backlight, and DAC which (as far as i know)
xorg does not. It also does better than jhb's patch to acpi_video. (I
suspect that the patch does not turn off the DAC.)

You need to add acpi_video_load="YES" and probably want to add
vesa_load="YES" and acpi_ibm_load="YES", although those are probably not
related to your current problem.

You may also need to add hw.acpi.reset_video=0 and
hw.syscons.sc_no_suspend_vtswitch=1 to /etc/sysctl.conf.
-- 
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