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I have an embedded board with a small UPS. When AC power goes down, I need to turn off all power hungry devices in order to have a clean shutdown. First thing I do, is set DPMS to force powerdown, then go through the usual SIGTERM/SIGKILL/umount sequence. I have an Intel i915 Display adapter connected to an LVDS LCD panel.

Unfortunately, when Xorg dies, Xserver or the VT code turn the LCD panel back on.

I even tried working around it by directly poking the panel enable register in the Display chip, so that X doesn't know about it, but the panel goes back on when the VT comes back.

Is there any "legal" way of keeping the display off?

Thank you

quack quixote
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Metiu
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2 Answers2

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Just leave Xorg running. Let it die when the system shuts down.

Ignacio Vazquez-Abrams
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Don't plug the monitor into the UPS. Or is it a device with an embedded screen? For turning off the display from a VT, you may find vbetool useful.

Ryan C. Thompson
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