Difference between revisions of "AIMLinux/BSP/Linux/MT8395/control brightness backlight"
From ESS-WIKI
(Created page with "{{DISPLAYTITLE:How to control panel brightness and backlight}} === Brightness Control === <syntaxhighlight lang="bash"> # valid range : 0x0FFF (dark) ~ 0x0000 (brightest) # h...") |
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{{DISPLAYTITLE:How to control panel brightness and backlight}} | {{DISPLAYTITLE:How to control panel brightness and backlight}} | ||
| − | + | == Brightness Control == | |
<syntaxhighlight lang="bash"> | <syntaxhighlight lang="bash"> | ||
# valid range : 0x0FFF (dark) ~ 0x0000 (brightest) # highest 4 bits must be zero | # valid range : 0x0FFF (dark) ~ 0x0000 (brightest) # highest 4 bits must be zero | ||
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</syntaxhighlight> | </syntaxhighlight> | ||
| − | + | == Backlight Control == | |
<syntaxhighlight lang="bash"> | <syntaxhighlight lang="bash"> | ||
# enable | # enable | ||
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sudo i2cset -f -y 2 0x20 0xe8 0x01 0x78 0x45 0x56 i && sudo reboot | sudo i2cset -f -y 2 0x20 0xe8 0x01 0x78 0x45 0x56 i && sudo reboot | ||
</syntaxhighlight> | </syntaxhighlight> | ||
| + | |||
| + | == References == | ||
| + | * PTN3460 Programming Guide | ||
Latest revision as of 05:10, 3 January 2024
Brightness Control
# valid range : 0x0FFF (dark) ~ 0x0000 (brightest) # highest 4 bits must be zero
# notice: keep highest 4 bits zero or brightness will be dark whatever lower 12 bits set
# use hexadecimal without leading "0x" (default:7FF)
BRIGHTNESS=6FF
sudo i2cset -f -y 2 0x20 0x90 $(( $((16#$BRIGHTNESS)) / 256 )) $(( $((16#$BRIGHTNESS)) % 256 )) i
# keep setting
sudo i2cset -f -y 2 0x20 0xe8 0x01 0x78 0x45 0x56 i && sudo reboot
Backlight Control
# enable
sudo i2cset -f -y 2 0x20 0x95 0
# disable
sudo i2cset -f -y 2 0x20 0x95 1
# keep setting
# notice: if "disable" is set, the panel keeps backlight disabled after reboot
sudo i2cset -f -y 2 0x20 0xe8 0x01 0x78 0x45 0x56 i && sudo reboot
References
- PTN3460 Programming Guide