Any set_lcd_level() call can fail for one of two reasons: either
requested brightness is outside the allowed range or the ACPI method
used for setting brightness level is not available. For
bl_update_status(), the first case is handled by backlight core, which
means bl_update_status() will not
Any set_lcd_level() call can fail for one of two reasons: either
requested brightness is outside the allowed range or the ACPI method
used for setting brightness level is not available. For
bl_update_status(), the first case is handled by backlight core, which
means bl_update_status() will not
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