Em sistemas enxutos como i3wm, openbox e etc, é comum instalar e configurar o xbacklight para controlar o brilho da tela. é possível utilizar o xfce4-power-manager para realizar essa tarefa, porém não será tratado aqui.
O xbacklight funciona apenas com a Intel . Outros drivers (por exemplo, Radeon ) não adicionaram suporte para a propriedade backlight RandR.
O xbacklight atualmente não funciona com o driver modesetting [fonte] .
Comandos para setar o brilho pelo terminal:
Exemplo em como setar o valor para 50% do brilho:
$ xbacklight -set 50
Incrementa 10
$ xbacklight -inc 10
Decrementa 10
$ xbacklight -dec 10
Para instalar:
$ sudo apt install xbacklight
Verificar se existe intel_backlight.
$ ls /sys/class/backlight
Para pegar o Identifier
$ xrandr --verbose
exemplo:
$ xrandr --verbose
Screen 0: minimum 8 x 8, current 1366 x 768, maximum 32767 x 32767
LVDS1 connected primary 1366x768+0+0 (0x49) normal (normal left inverted right x axis y axis) 310mm x 170mm
Identifier: 0x43 // nessa linha que pega o identifier
Timestamp: 12245721
Subpixel: horizontal rgb
Gamma: 1.0:1.0:1.0
Brightness: 1.0
Clones:
CRTC: 0
CRTCs: 0 1 2
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
EDID:
00ffffffffffff0006af3c3000000000
00150104901f11780210b59758579226
1e505400000001010101010101010101
010101010101ce1d56e250001e302616
360035ad10000018df1356e250001e30
2616360035ad10000018000000000000
00000000000000000000000000000002
000c4cff0a3c6412121e652020200071
BACKLIGHT: 1171
range: (0, 4882)
Backlight: 1171
range: (0, 4882)
scaling mode: Full aspect
supported: Full, Center, Full aspect
link-status: Good
supported: Good, Bad
non-desktop: 0
range: (0, 1)
1366x768 (0x49) 76.300MHz -HSync -VSync *current +preferred
h: width 1366 start 1404 end 1426 total 1592 skew 0 clock 47.93KHz
v: height 768 start 771 end 777 total 798 clock 60.06Hz
1366x768 (0x122) 50.870MHz -HSync -VSync
h: width 1366 start 1404 end 1426 total 1592 skew 0 clock 31.95KHz
v: height 768 start 771 end 777 total 798 clock 40.04Hz
1360x768 (0x123) 72.000MHz +HSync -VSync
h: width 1360 start 1408 end 1440 total 1520 skew 0 clock 47.37KHz
v: height 768 start 771 end 781 total 790 clock 59.96Hz
1280x720 (0x124) 74.500MHz -HSync +VSync
h: width 1280 start 1344 end 1472 total 1664 skew 0 clock 44.77KHz
v: height 720 start 723 end 728 total 748 clock 59.86Hz
1280x720 (0x125) 74.480MHz -HSync +VSync
h: width 1280 start 1336 end 1472 total 1664 skew 0 clock 44.76KHz
v: height 720 start 721 end 724 total 746 clock 60.00Hz
1280x720 (0x126) 63.750MHz +HSync -VSync
h: width 1280 start 1328 end 1360 total 1440 skew 0 clock 44.27KHz
v: height 720 start 723 end 728 total 741 clock 59.74Hz
1024x768 (0x127) 65.000MHz -HSync -VSync
h: width 1024 start 1048 end 1184 total 1344 skew 0 clock 48.36KHz
v: height 768 start 771 end 777 total 806 clock 60.00Hz
1024x576 (0x128) 46.995MHz -HSync +VSync
h: width 1024 start 1064 end 1168 total 1312 skew 0 clock 35.82KHz
v: height 576 start 577 end 580 total 597 clock 60.00Hz
1024x576 (0x129) 46.500MHz -HSync +VSync
h: width 1024 start 1064 end 1160 total 1296 skew 0 clock 35.88KHz
v: height 576 start 579 end 584 total 599 clock 59.90Hz
1024x576 (0x12a) 42.000MHz +HSync -VSync
h: width 1024 start 1072 end 1104 total 1184 skew 0 clock 35.47KHz
v: height 576 start 579 end 584 total 593 clock 59.82Hz
960x540 (0x12b) 40.784MHz -HSync +VSync
h: width 960 start 992 end 1088 total 1216 skew 0 clock 33.54KHz
v: height 540 start 541 end 544 total 559 clock 60.00Hz
960x540 (0x12c) 40.750MHz -HSync +VSync
h: width 960 start 992 end 1088 total 1216 skew 0 clock 33.51KHz
v: height 540 start 543 end 548 total 562 clock 59.63Hz
960x540 (0x12d) 37.250MHz +HSync -VSync
h: width 960 start 1008 end 1040 total 1120 skew 0 clock 33.26KHz
v: height 540 start 543 end 548 total 556 clock 59.82Hz
800x600 (0x12e) 40.000MHz +HSync +VSync
h: width 800 start 840 end 968 total 1056 skew 0 clock 37.88KHz
v: height 600 start 601 end 605 total 628 clock 60.32Hz
800x600 (0x12f) 36.000MHz +HSync +VSync
h: width 800 start 824 end 896 total 1024 skew 0 clock 35.16KHz
v: height 600 start 601 end 603 total 625 clock 56.25Hz
864x486 (0x130) 32.901MHz -HSync +VSync
h: width 864 start 888 end 976 total 1088 skew 0 clock 30.24KHz
v: height 486 start 487 end 490 total 504 clock 60.00Hz
864x486 (0x131) 32.500MHz -HSync +VSync
h: width 864 start 888 end 968 total 1072 skew 0 clock 30.32KHz
v: height 486 start 489 end 494 total 506 clock 59.92Hz
864x486 (0x132) 30.500MHz +HSync -VSync
h: width 864 start 912 end 944 total 1024 skew 0 clock 29.79KHz
v: height 486 start 489 end 494 total 500 clock 59.57Hz
640x480 (0x133) 25.175MHz -HSync -VSync
h: width 640 start 656 end 752 total 800 skew 0 clock 31.47KHz
v: height 480 start 490 end 492 total 525 clock 59.94Hz
720x405 (0x134) 22.500MHz -HSync +VSync
h: width 720 start 744 end 808 total 896 skew 0 clock 25.11KHz
v: height 405 start 408 end 413 total 422 clock 59.51Hz
720x405 (0x135) 22.176MHz -HSync +VSync
h: width 720 start 728 end 800 total 880 skew 0 clock 25.20KHz
v: height 405 start 406 end 409 total 420 clock 60.00Hz
720x405 (0x136) 21.750MHz +HSync -VSync
h: width 720 start 768 end 800 total 880 skew 0 clock 24.72KHz
v: height 405 start 408 end 413 total 419 clock 58.99Hz
680x384 (0x137) 19.677MHz -HSync +VSync
h: width 680 start 688 end 752 total 824 skew 0 clock 23.88KHz
v: height 384 start 385 end 388 total 398 clock 60.00Hz
640x360 (0x138) 18.000MHz -HSync +VSync
h: width 640 start 664 end 720 total 800 skew 0 clock 22.50KHz
v: height 360 start 363 end 368 total 376 clock 59.84Hz
640x360 (0x139) 17.750MHz +HSync -VSync
h: width 640 start 688 end 720 total 800 skew 0 clock 22.19KHz
v: height 360 start 363 end 368 total 374 clock 59.32Hz
640x360 (0x13a) 17.187MHz -HSync +VSync
h: width 640 start 640 end 704 total 768 skew 0 clock 22.38KHz
v: height 360 start 361 end 364 total 373 clock 60.00Hz
DP1 disconnected (normal left inverted right x axis y axis)
Identifier: 0x44
Timestamp: 12245721
Subpixel: unknown
Clones:
CRTCs: 0 1 2
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
Broadcast RGB: Automatic
supported: Automatic, Full, Limited 16:235
audio: auto
supported: force-dvi, off, auto, on
link-status: Good
supported: Good, Bad
non-desktop: 0
range: (0, 1)
HDMI1 disconnected (normal left inverted right x axis y axis)
Identifier: 0x45
Timestamp: 12245721
Subpixel: unknown
Clones: VGA1
CRTCs: 0 1 2
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
content type: No Data
supported: No Data, Graphics, Photo, Cinema, Game
aspect ratio: Automatic
supported: Automatic, 4:3, 16:9
Broadcast RGB: Automatic
supported: Automatic, Full, Limited 16:235
audio: auto
supported: force-dvi, off, auto, on
link-status: Good
supported: Good, Bad
non-desktop: 0
range: (0, 1)
VGA1 disconnected (normal left inverted right x axis y axis)
Identifier: 0x46
Timestamp: 12245721
Subpixel: unknown
Clones: HDMI1
CRTCs: 0 1 2
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
link-status: Good
supported: Good, Bad
non-desktop: 0
range: (0, 1)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
Identifier: 0x47
Timestamp: 12245721
Subpixel: no subpixels
Clones:
CRTCs: 3
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
non-desktop: 0
supported: 0, 1
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