eleksir/wm-helpers
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xbacklight: fix incorrect path, add comment

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eleksir
2020-03-08 14:52:00 +03:00
parent 4c04356810
commit d88d4a552a
1 changed files with 16 additions and 7 deletions
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23
xbacklight
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@@ -1,4 +1,10 @@
#!/usr/bin/perl
#
# TODO: check intel' backlight path too if generic is not found
# this script should have suid bit set and must have root owner :(
use strict;
use warnings "all";
my $arg = $ARGV[0];
my $step = 10; # measured in percents
@@ -6,12 +12,15 @@ my $step = 10; # measured in percents
sub fsread($); # read 1-st line from file
sub fswrite(@); # write string to file
my $brightnessfile = "/sys/class/backlight/acpi_video0/brightness";
my $maxbrightness = fsread("/sys/class/backlight/acpi_video0/max_brightness");
my $currbrightness = fsread($brightnessfile);
#my $prefix = "/sys/class/backlight/acpi_video0";
my $prefix = "/sys/class/backlight/intel_backlight";
my $a = $maxbrightness / 100;
$step = int($step * $a);
my $brightnessfile = "$prefix/brightness";
my $maxbrightness = fsread("$prefix/max_brightness");
my $currbrightness = fsread("$prefix/brightness");
my $p = $maxbrightness / 100;
$step = int($step * $p);
if ( $arg eq "up" ) {
if ($currbrightness != $maxbrightness) {
@@ -38,7 +47,7 @@ if ( $arg eq "up" ) {
sub fsread($) {
my $fname = shift;
open (F, $fname) || die;
open (F, $fname) || die "Unable to read $fname: $!\n";
my $str = <F>;
close F;
return $str;
@@ -47,7 +56,7 @@ sub fsread($) {
sub fswrite (@) {
my $str = shift;
my $fname = shift;
open(OF, ">", $fname) || die;
open(OF, ">", $fname) || die "Unable to write $fname: $!\n";
print OF $str;
close OF;
}