Some display settings of lubuntu

lin_jc

set display scale:

1. root@firefly:~# cat /sys/class/graphics/fb0/scale
   
2. xscale=100 yscale=100
   
3. left=100 top=100 right=100 bottom=100
   
4. 
   
5. root@firefly:~# echo 95 > /sys/class/graphics/fb0/scale
   
6. root@firefly:~# cat /sys/class/graphics/fb0/scale
   
7. xscale=95 yscale=95
   
8. left=95 top=95 right=95 bottom=95
   
9. 
   
10. root@firefly:~# echo yscale=80 > /sys/class/graphics/fb0/scale
    
11. root@firefly:~# cat /sys/class/graphics/fb0/scale
    
12. xscale=100 yscale=80
    
13. left=100 top=80 right=100 bottom=80
    
14. 
    
15. root@firefly:~# echo xscale=80 > /sys/class/graphics/fb0/scale
    
16. root@firefly:~# cat /sys/class/graphics/fb0/scale
    
17. xscale=80 yscale=100
    
18. left=80 top=100 right=80 bottom=100

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set HDMI output mode

1. root@firefly:~# cat /sys/class/display/display0.HDMI/mode
   
2. 1920x1080p-60
   
3. 
   
4. root@firefly:~# cat /sys/class/display/display0.HDMI/modes
   
5. auto
   
6. 1920x1080p-60
   
7. 1920x1080p-50
   
8. 1280x720p-60
   
9. 1280x720p-50
   
10. 720x576p-50
    
11. 720x480p-60
    
12. 
    
13. root@firefly:~# echo 720x480p-60 > /sys/class/display/display0.HDMI/mode

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set full color depth
Set full color depth need to use fbset, however, it installed by default in Lubuntu of Firefly-RK3288. if your ubuntu is not installed fbset, you can install it by: sudo apt-get install fbset

then, create a file /etc/init/fbset.conf  

1. # fbset - run fbset to set truecolor fbmode
   
2. description "run fbset ASAP"
   
3. start on startup and started udev or starting lightdm
   
4. task
   
5. script
   
6.     [ -x /bin/fbset ] && /bin/fbset -a -nonstd 1 -depth 32 -rgba "8/0,8/8,8/16,8/24"
   
7. end script

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create a file /etc/X11/xorg.conf

1. Section "Screen"
   
2.     Identifier "Default Screen"
   
3.     DefaultDepth 24
   
4. EndSection

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at last, add startup code in file /etc/rc.local   

1. service lightdm stop
   
2. fbset -a -nonstd 1 -depth 32 -rgba 8/0,8/8,8/16,8/24
   
3. service lightdm start

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