org license (BSDstyle),
and it appears that it may be managed as part of the X.org
server project soon. Until that happens, information about the driver
is maintained at http://web.telia.com/~u89404340/touchpad/.
3.11 Enabling DPMS
DPMS is a VESA standard that conserves energy by using the horizontal and vertical
sync signals to select one of four power states.
These are the four states defined by VESA, with maximum power levels defined by
the EPA??™s Energy Star program and typical turn-on times:
State name H-sync V-sync
Maximum power used (Energy
Star - Tier 2, January 2006)
Typical time to
On state
On Active Active 28 W per megapixel ---
Standby Off Active Not specified; typically less than
22 W per megapixel
<5 seconds
3.11
3.11 Enabling DPMS 55
A few extremely old monitors cannot handle having just one of the
sync signals turned off. These monitors could be permanently damaged
or pose a fire hazard if used with DPMS. However, almost all
monitors in use today support DPMS.
In a CRT-based monitor, energy savings are accomplished by turning off the electron
beam, electromagnets, and cathode heater. LCD monitors don??™t have these
energy-hungry components, so most LCD monitors treat all three energy-saving
modes in the same way: by turning the display off entirely.
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