I was looking at a strace of nickel today, and found that the Glo's frontlight is controlled by ioctl calls to /dev/ntx_io. I hacked together some quick C code to control the light:
I know that some people, myself included, would like the light to go lower than the lowest setting offered by Kobo. And while there is one light level lower, level 1, that the Glo never uses, setting the frontlight to that level causes flickering that is very noticeable in a dark room.
I've attached the source code and the compiled program below.
Code:
#include <stdio.h>
#include <fcntl.h>
#include <sys/ioctl.h>
int main(int argc, char *argv[])
{
if ( argc != 2 ) {
printf("Usage: %s brightness \n", argv[0]);
return 1;
}
int light;
// Open the file for reading and writing
if ((light = open("/dev/ntx_io", O_RDWR)) == -1) {
printf("Error opening ntx_io device");
}
int brightness = atoi ( (argv[1]) );
ioctl(light, 241, brightness);
return 0;
}I've attached the source code and the compiled program below.