On Mon, 09 Dec 2013, zaverel <zaverel@xxxxxxx> wrote:
> 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.
Quoting xrandr(1) man page:
--brightness brightness
Multiply the gamma values on the crtc currently attached to the
output to specified floating value. Useful for overly bright or
overly dim outputs. However, this is a software only modifica‐
tion, if your hardware has support to actually change the
brightness, you will probably prefer to use xbacklight.
Try 'xrandr --verbose' or 'xbacklight -get' to see if you have outputs
with backlight control support; this is usually the case for local flat
panels such as eDP or LVDS only.
BR,
Jani.
>
> 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
>
>
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--
Jani Nikula, Intel Open Source Technology Center
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