Screen Blanking

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Hi All,

Is there some way to blank the screen from the user space using a
ioctl or something equivalent?

I see that the video drivers do implement the blank/unblank interface
to stop rendering of the image on the screen. These interface
functions normally set the VSYNC to 0. For example in
/<linux-src>/drivers/video/vgacon.c, I see the con_blank interface
function called vgacon_blank being implemented. I would like to know
how to get this interface invoked using a user space application or
ioctl. These interfaces may be called by the power management APIs to
save power by stopping the screen rendering.

Thanks in advance,
-Jinu

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