Dell LATITUDE D620 User Manual page 86

Dell - Latitude™ D620 - Printer-Friendly Format
DPST works with either the SMBus on the system or ALS, but not both. The following table explains what happens to the
system depending on which features are implemented:
Operating On/Off Brightness
Mode Control Control
Adjusts from
Up/down hot
SMBus eight EEDID
keys
QuickSet
controls
ALS hot key
min/max
ALS toggle turns
ALS off
adjustment
per ALS curve
Intel Graphics Reduces the
Control or existing
QuickSet brightness
DPST DPST is setting from
always off 0–30% based
when on AC on image
power content
SMBus sets
SMBus with See DPST brightness
DPST and SMBus while DPST
reduces 0–
ALS sets max
brightness
ALS with See DPST
while DPST
DPST and ALS
reduces 0–
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ALS Controls
Impact to Impact to
SMBus ALS
N/A Turns ALS off
steps
ALS overrides
SMBus and
operates as N/A
range
set by
QuickSet
Reduces Reduces
existing existing ALS
SMBus setting setting from
from 0–30% 0–30%
max
N/A Disables ALS
30%
Disables
N/A
SMBus
30%
Latitude™ D620
Ambient Light Sensor
Impact to
Notes
DPST
When DPST
is enabled, Factory
SMBus default is
controls the EEDID step 4
max limit of (30 nits)
DPST
When DPST
QuickSet
is enabled,
default is
ALS controls
battery
the max limit
savings mode
of DPST
DPST is
disabled any
time an
N/A
external
display device
is connected
N/A
N/A
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22/02/2010