From mboxrd@z Thu Jan  1 00:00:00 1970
From: zaverel <zaverel@free.fr>
Subject: setting  brightness with xrandr seem wrong
Date: Mon, 09 Dec 2013 18:23:09 +0100
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hello,


is it normal that if I rule the brightness with xrandr, only the value 
of gamma change and not the brightness ?

display actually becomes much clearer but this is due to gamma or 
brightness ?
That is the question.

Thanks.
See you.


xrandr  --output HDMI2 --brightness 1.20

xrandr --verbose report:

...
HDMI2 connected 1920x1080+0+0 (0x4a) normal (normal left inverted right 
x axis y axis) 160mm x 90mm
         Identifier: 0x46
         Timestamp:  1071203
         Subpixel:   unknown
         Gamma:      0.75:0.75:0.75
         Brightness: 1.0
         Clones:
         CRTC:       1
         CRTCs:      0 1 2
         Transform:  1.000000 0.000000 0.000000
                     0.000000 1.000000 0.000000
                     0.000000 0.000000 1.000000
                    filter:
...


I use latest xf86-video-intel devel from today
xrandr 1.4.1
kernel 3.12.4




lspci -vxxx -s 0:02.0

00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v2/3rd 
Gen Core processor Graphics Controller (rev 09) (prog-if 00 [VGA 
controller])
         Subsystem: Micro-Star International Co., Ltd. Device 2111
         Flags: bus master, fast devsel, latency 0, IRQ 43
         Memory at f7800000 (64-bit, non-prefetchable) [size=4M]
         Memory at e0000000 (64-bit, prefetchable) [size=256M]
         I/O ports at f000 [size=64]
         Expansion ROM at <unassigned> [disabled]
         Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
         Capabilities: [d0] Power Management version 2
         Capabilities: [a4] PCI Advanced Features
         Kernel driver in use: i915
         Kernel modules: i915
00: 86 80 52 01 07 04 90 00 09 00 00 03 00 00 00 00
10: 04 00 80 f7 00 00 00 00 0c 00 00 e0 00 00 00 00
20: 01 f0 00 00 00 00 00 00 00 00 00 00 62 14 11 21
30: 00 00 00 00 90 00 00 00 00 00 00 00 0b 01 00 00
40: 09 00 0c 01 92 80 80 e2 d0 00 50 14 00 00 00 00
50: 41 02 00 00 11 00 00 00 00 00 00 00 01 00 a0 cf
60: 00 00 02 00 00 00 00 00 00 00 00 00 00 00 00 00
70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
90: 05 d0 01 00 0c f0 e0 fe c1 41 00 00 00 00 00 00
a0: 00 00 00 00 13 00 06 03 00 00 00 00 00 00 00 00
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
d0: 01 a4 22 00 00 00 00 00 00 00 00 00 00 00 00 00
e0: 00 00 00 00 00 00 00 00 00 80 00 00 00 00 00 00
f0: 00 00 00 00 00 00 00 00 00 00 09 00 18 60 43 cd