xrandr --verbose
Screen 0: minimum 320 x 200, current 1366 x 768, maximum 32767 x 32767
LVDS1 connected 1366x768+0+0 (0x7c) normal (normal left inverted right x axis y axis) 344mm x 194mm
	Identifier: 0x77
	Timestamp:  15013
	Subpixel:   horizontal rgb
	Gamma:      1.0:1.0:1.0
	Brightness: 1.0
	Clones:    
	CRTC:       0
	CRTCs:      0 1
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	EDID: 
		00ffffffffffff0030e43a0300000000
		00160103802213780a61d59e5e5b9a26
		1a505400000001010101010101010101
		010101010101e21d56c4500030302430
		350058c2100000190000000000000000
		00000000000000000000000000fe004c
		4720446973706c61790a2020000000fe
		004c503135365748342d544c4e31008e
	BACKLIGHT: 0 
		range: (0, 4882)
	Backlight: 0 
		range: (0, 4882)
	scaling mode: Full aspect 
		supported: None, Full, Center, Full aspect
  1366x768 (0x7c)   76.5MHz -HSync -VSync *current +preferred
        h: width  1366 start 1402 end 1450 total 1562 skew    0 clock   49.0KHz
        v: height  768 start  771 end  776 total  816           clock   60.0Hz
  1024x768 (0xd6)   65.0MHz -HSync -VSync
        h: width  1024 start 1048 end 1184 total 1344 skew    0 clock   48.4KHz
        v: height  768 start  771 end  777 total  806           clock   60.0Hz
  800x600 (0xd7)   40.0MHz +HSync +VSync
        h: width   800 start  840 end  968 total 1056 skew    0 clock   37.9KHz
        v: height  600 start  601 end  605 total  628           clock   60.3Hz
  800x600 (0xd8)   36.0MHz +HSync +VSync
        h: width   800 start  824 end  896 total 1024 skew    0 clock   35.2KHz
        v: height  600 start  601 end  603 total  625           clock   56.2Hz
  640x480 (0xd9)   25.2MHz -HSync -VSync
        h: width   640 start  656 end  752 total  800 skew    0 clock   31.5KHz
        v: height  480 start  490 end  492 total  525           clock   59.9Hz
VGA1 disconnected (normal left inverted right x axis y axis)
	Identifier: 0x78
	Timestamp:  15013
	Subpixel:   unknown
	Clones:    
	CRTCs:      0 1
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
HDMI1 disconnected (normal left inverted right x axis y axis)
	Identifier: 0x79
	Timestamp:  15013
	Subpixel:   unknown
	Clones:    
	CRTCs:      0 1
	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
DP1 disconnected (normal left inverted right x axis y axis)
	Identifier: 0x7a
	Timestamp:  15013
	Subpixel:   unknown
	Clones:    
	CRTCs:      0 1
	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

/sys/class/backlight/intel_backlight/actual_brightness
0

/sys/class/backlight/intel_backlight/bl_power
0

/sys/class/backlight/intel_backlight/brightness
0

/sys/class/backlight/intel_backlight/max_brightness
4882

/sys/class/backlight/intel_backlight/type
raw

/sys/class/backlight/intel_backlight/uevent