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ALS Controls
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
Mode
On/Off
Control
Brightness
Control
Impact to
SMBus
Impact to
ALS
Impact to
DPST
Notes
SMBus
Up/down hot
keys
Adjusts from
eight EEDID
steps
N/A Turns ALS off
When DPST
is enabled,
SMBus
controls the
max limit of
DPST
Factory
default is
EEDID step 4
(30 nits)
ALS
ALS hot key
toggle turns
ALS off
QuickSet
controls
min/max
range
adjustment
per ALS curve
ALS overrides
SMBus and
operates as
set by
QuickSet
N/A
When DPST
is enabled,
ALS controls
the max limit
of DPST
QuickSet
default is
battery
savings mode
DPST
Intel Graphics
Control or
QuickSet
DPST is
always off
when on AC
power
Reduces the
existing
brightness
setting from
0–30% based
on image
content
Reduces
existing
SMBus setting
from 0–30%
Reduces
existing ALS
setting from
0–30%
N/A
DPST is
disabled any
time an
external
display device
is connected
SMBus with
DPST
See DPST
and SMBus
SMBus sets
max
brightness
while DPST
reduces 0–
30%
N/A Disables ALS N/A
ALS with
DPST
See DPST
and ALS
ALS sets max
brightness
while DPST
reduces 0–
30%
Disables
SMBus
N/A N/A
Printed 2/22/2010 11:17:19 AM
Latitude™ D620
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Expires 2/23/2010 11:17:19 AM
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