xorg DPMS off: keep VT from turning screen back on

Posted by Metiu on Super User See other posts from Super User or by Metiu
Published on 2010-03-19T17:43:54Z Indexed on 2010/03/19 17:51 UTC
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Filed under:

xorg

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linux

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dpms

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vt

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

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