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fix(backlight): Use 'brightness' with amdgpu_bl0

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The amdgpu driver seems to set 'actual_brightness' wrong.

Fixes #1870
Ref: https://github.com/Alexays/Waybar/issues/335
This commit is contained in:
patrick96
2019-10-15 16:39:18 +02:00
committed by Patrick Ziegler
parent fea579ec85
commit 2b31a3f112
3 changed files with 16 additions and 10 deletions
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17
src/modules/backlight.cpp
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@ -40,12 +40,21 @@ namespace modules {
m_ramp = load_ramp(m_conf, name(), TAG_RAMP);
}
// Build path to the file where the current/maximum brightness value is located
m_val.filepath(string_util::replace(PATH_BACKLIGHT_VAL, "%card%", card));
m_max.filepath(string_util::replace(PATH_BACKLIGHT_MAX, "%card%", card));
// Build path to the sysfs folder the current/maximum brightness values are located
auto path_backlight = string_util::replace(PATH_BACKLIGHT, "%card%", card);
/*
* amdgpu drivers set the actual_brightness in a different scale than [0, max_brightness]
* The only sensible way is to use the 'brightness' file instead
* Ref: https://github.com/Alexays/Waybar/issues/335
*/
auto path_backlight_val = path_backlight + "/" + (card == "amdgpu_bl0"? "brightness" : "actual_brightness");
m_val.filepath(path_backlight_val);
m_max.filepath(path_backlight + "/max_brightness");
// Add inotify watch
watch(string_util::replace(PATH_BACKLIGHT_VAL, "%card%", card));
watch(path_backlight_val);
}
void backlight_module::idle() {