API to turn off the display
randy at psg.com
Fri Jan 30 21:33:21 PST 2004
> I have found that too. I did most of my testing over ssh, until I setup
> a serial login console (boot -h, and appropriate line in /etc/ttys) , so
> I could see any messages that I might be missing... and I could not
> reproduce the hang. Suspended without any problem at all. Tried booting
> with the -h and I could reproduce the hang every time.
> Recompiled the kernel with:
> options SC_NO_SUSPEND_VTYSWITCH
> and now it all works!
> I added to rc.suspend:
> xset -display :0 dpms force off
> sleep 3
> sysctl hw.acpi.video.lcd0.active=0
> sleep 1
> sysctl hw.acpi.cpu.throttle_state=1
> and to rc.resume:
> sysctl hw.acpi.cpu.throttle_state=8
> xset -display :0 dpms force on
> sysctl hw.acpi.video.lcd0.active=1
> The order of DPMS and ACPI is important. This works on both the console
> and in X. Next up is to add in ataidle...
this helps a LOT. but ...
i can suspend once and resume once. after that, it will not suspend
with lid or button.
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