Is there any command (or API) to set X.Org/Linux color brightness?
In other words, I need something as handy as the xgamma command but for changing RGB brightness real-time.
Is this possibile?
Use the XF86VidMode* family of functions.
#include <X11/Xlib.h>
#include <X11/extensions/xf86vmode.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int main() {
Display *display;
int screen;
int major, minor;
int i;
XF86VidModeGamma orig;
display = XOpenDisplay(NULL);
if (!display) return -1;
screen = DefaultScreen(display);
if (!XF86VidModeQueryVersion(display, &major, &minor)
|| major < 2 || major == 2 && minor < 0
|| !XF86VidModeGetGamma(display, screen, &orig)) {
XCloseDisplay(display);
return -1;
}
for (i = 0; i <= 32; i++) {
XF86VidModeGamma gamma;
gamma.red = exp2f(2 - fabs(i - 16) / 4);
gamma.green = gamma.red;
gamma.blue = gamma.red;
if (!XF86VidModeSetGamma(display, screen, &gamma)) break;
printf("gamma: %f %f %f", gamma.red, gamma.green, gamma.blue);
if (!XF86VidModeGetGamma(display, screen, &gamma)) break;
printf(" -> %f %f %f\n", gamma.red, gamma.green, gamma.blue);
sleep(1);
}
XF86VidModeSetGamma(display, screen, &orig);
XF86VidModeGetGamma(display, screen, &orig);
XCloseDisplay(display);
return 0;
}
This brings the gamma from 0.25 to 4.0 and back, and then restores the original gamma.
Or you could just repeatedly call system("xgamma -gamma %f")
, with pretty much the same results.
To control LCD brightness:
echo 4 > /proc/acpi/video/GFX0/LCD/brightness
The range is 1 to 8.
xbacklight -set 80
You have to install this software from your repository. Works well on most laptops, at least on ThinkPads :-)
May Be You need XRandr?
来源:https://stackoverflow.com/questions/1963473/setting-color-brightness-on-linux-xorg