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setterm -blank nn will tell the console driver to blank the
screen after nn minutes of inactivity. (With nn = 0, screensaving
is turned off. In some old kernels this first took effect after the next
keyboard interrupt.)
The s option of xset(1) will set the X screensaving parameters:
xset s off turns off the screensaver,
xset s 10 blanks the screen after 10 minutes.
The video hardware powersaving modes can be enabled/disabled
using the setvesablank program given in the starting comment of
/usr/src/linux/drivers/char/vesa_blank.c.
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