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backlight: ignore error if the backlight device is already removed

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Fixes #21997.
This commit is contained in:
Yu Watanabe 2022-01-05 18:26:46 +09:00 committed by Luca Boccassi
parent c01b58e454
commit f0f6508783
1 changed files with 10 additions and 2 deletions
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12
src/backlight/backlight.c
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@ -395,8 +395,16 @@ static int run(int argc, char *argv[]) {
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Not a backlight or LED device: '%s:%s'", ss, sysname);
r = sd_device_new_from_subsystem_sysname(&device, ss, sysname);
if (r < 0)
return log_error_errno(r, "Failed to get backlight or LED device '%s:%s': %m", ss, sysname);
if (r < 0) {
bool ignore = r == -ENODEV;
/* Some drivers, e.g. for AMD GPU, removes acpi backlight device soon after it is added.
* See issue #21997. */
log_full_errno(ignore ? LOG_DEBUG : LOG_ERR, r,
"Failed to get backlight or LED device '%s:%s'%s: %m",
ss, sysname, ignore ? ", ignoring" : "");
return ignore ? 0 : r;
}
/* If max_brightness is 0, then there is no actual backlight device. This happens on desktops
* with Asus mainboards that load the eeepc-wmi module. */