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Brightness keys don't work even if "Handle display brightness keys" option is checked

Hello,

Checking "Handle display brightness keys" in Xfce Power Manager has no effect.

I'm using Arch Linux with Xfce and everything is up to date.

My laptop is a chromebook Acer CB3-131. I use the French chromebook keyboard layout.

This is the result of xev when I press my brightness keys:

KeyPress event, serial 37, synthetic NO, window 0x4800001,
    root 0x134, subw 0x0, time 1247125, (143,239), root:(737,560),
    state 0x0, keycode 72 (keysym 0x1008ff03, XF86MonBrightnessDown), same_screen YES,
    XLookupString gives 0 bytes: 
    XmbLookupString gives 0 bytes: 
    XFilterEvent returns: False

KeyPress event, serial 37, synthetic NO, window 0x4800001,
    root 0x134, subw 0x0, time 1247669, (143,239), root:(737,560),
    state 0x0, keycode 73 (keysym 0x1008ff02, XF86MonBrightnessUp), same_screen YES,
    XLookupString gives 0 bytes: 
    XmbLookupString gives 0 bytes: 
    XFilterEvent returns: False

The package xf86-video-intel is installed.

My backlight device is /sys/class/backlight/intel_backlight/

Also when I run xfce4-power-manager in debug mode, this is the result:

** (xfce4-power-manager:1616): WARNING **: 13:13:46.004: Failed to get name owner: GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: Could not get owner of name 'org.freedesktop.PowerManagement': no such name


** (xfce4-power-manager:1616): WARNING **: 13:13:46.005: Failed to get name owner: GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwner: Could not get owner of name 'org.xfce.PowerManager': no such name

TRACE[xfpm-main.c:210] xfpm_start(): Starting the power manager
TRACE[xfpm-xfconf.c:166] xfpm_xfconf_load(): Using default configuration for lock-screen-suspend-hibernate
TRACE[xfpm-xfconf.c:166] xfpm_xfconf_load(): Using default configuration for critical-power-level
TRACE[xfpm-xfconf.c:166] xfpm_xfconf_load(): Using default configuration for show-brightness-popup
TRACE[xfpm-xfconf.c:166] xfpm_xfconf_load(): Using default configuration for brightness-step-count
TRACE[xfpm-xfconf.c:166] xfpm_xfconf_load(): Using default configuration for brightness-exponential
TRACE[xfpm-xfconf.c:166] xfpm_xfconf_load(): Using default configuration for power-button-action
TRACE[xfpm-xfconf.c:166] xfpm_xfconf_load(): Using default configuration for hibernate-button-action
TRACE[xfpm-xfconf.c:166] xfpm_xfconf_load(): Using default configuration for sleep-button-action
TRACE[xfpm-xfconf.c:166] xfpm_xfconf_load(): Using default configuration for battery-button-action
TRACE[xfpm-xfconf.c:166] xfpm_xfconf_load(): Using default configuration for lid-action-on-ac
TRACE[xfpm-xfconf.c:166] xfpm_xfconf_load(): Using default configuration for lid-action-on-battery
TRACE[xfpm-xfconf.c:166] xfpm_xfconf_load(): Using default configuration for brightness-level-on-ac
TRACE[xfpm-xfconf.c:166] xfpm_xfconf_load(): Using default configuration for brightness-level-on-battery
TRACE[xfpm-xfconf.c:166] xfpm_xfconf_load(): Using default configuration for brightness-slider-min-level
TRACE[xfpm-xfconf.c:166] xfpm_xfconf_load(): Using default configuration for dpms-sleep-mode
TRACE[xfpm-xfconf.c:166] xfpm_xfconf_load(): Using default configuration for inactivity-on-ac
TRACE[xfpm-xfconf.c:166] xfpm_xfconf_load(): Using default configuration for inactivity-sleep-mode-on-ac
TRACE[xfpm-xfconf.c:166] xfpm_xfconf_load(): Using default configuration for brightness-on-ac
TRACE[xfpm-xfconf.c:166] xfpm_xfconf_load(): Using default configuration for logind-handle-power-key
TRACE[xfpm-xfconf.c:166] xfpm_xfconf_load(): Using default configuration for logind-handle-suspend-key
TRACE[xfpm-xfconf.c:166] xfpm_xfconf_load(): Using default configuration for logind-handle-hibernate-key
TRACE[xfpm-xfconf.c:166] xfpm_xfconf_load(): Using default configuration for logind-handle-lid-switch
TRACE[xfpm-xfconf.c:166] xfpm_xfconf_load(): Using default configuration for heartbeat-command

(xfce4-power-manager:1616): GLib-GObject-WARNING **: 13:13:46.074: ../glib/gobject/gsignal.c:2614: signal 'Changed' is invalid for instance '0x55c9dd806b20' of type 'GDBusProxy'
TRACE[xfpm-polkit.c:284] xfpm_polkit_init_data(): Using unix session polkit subject
TRACE[xfpm-polkit.c:342] xfpm_polkit_check_auth_intern(): polkit request: (('unix-process', {'pid': <uint32 1616>, 'start-time': <uint64 180874>}), 'org.freedesktop.login1.power-off', @a{ss} {}, uint32 0, '')
TRACE[xfpm-polkit.c:363] xfpm_polkit_check_auth_intern(): Action=org.freedesktop.login1.power-off is authorized=TRUE
TRACE[xfpm-polkit.c:342] xfpm_polkit_check_auth_intern(): polkit request: (('unix-process', {'pid': <uint32 1616>, 'start-time': <uint64 180874>}), 'org.freedesktop.login1.reboot', @a{ss} {}, uint32 0, '')
TRACE[xfpm-polkit.c:363] xfpm_polkit_check_auth_intern(): Action=org.freedesktop.login1.reboot is authorized=TRUE
TRACE[xfpm-polkit.c:342] xfpm_polkit_check_auth_intern(): polkit request: (('unix-process', {'pid': <uint32 1616>, 'start-time': <uint64 180874>}), 'org.freedesktop.login1.suspend', @a{ss} {}, uint32 0, '')
TRACE[xfpm-polkit.c:363] xfpm_polkit_check_auth_intern(): Action=org.freedesktop.login1.suspend is authorized=TRUE
TRACE[xfpm-polkit.c:342] xfpm_polkit_check_auth_intern(): polkit request: (('unix-process', {'pid': <uint32 1616>, 'start-time': <uint64 180874>}), 'org.freedesktop.login1.hibernate', @a{ss} {}, uint32 0, '')
TRACE[xfpm-polkit.c:363] xfpm_polkit_check_auth_intern(): Action=org.freedesktop.login1.hibernate is authorized=TRUE
TRACE[xfpm-power.c:930] xfpm_power_get_power_devices(): Power device detected at : /org/freedesktop/UPower/devices/line_power_AC
TRACE[xfpm-power.c:889] xfpm_power_add_device(): 'line-power' device added
TRACE[xfpm-power.c:930] xfpm_power_get_power_devices(): Power device detected at : /org/freedesktop/UPower/devices/battery_BAT0
TRACE[xfpm-power.c:889] xfpm_power_add_device(): 'battery' device added
TRACE[xfpm-power.c:898] xfpm_power_add_device(): Battery device type 'battery' detected at: /org/freedesktop/UPower/devices/battery_BAT0
TRACE[xfpm-button.c:180] xfpm_button_xevent_key(): Grabbed key 124 : ((XfpmButtonKey) BUTTON_POWER_OFF)

(xfce4-power-manager:1616): xfce4-power-manager-WARNING **: 13:13:46.117: could not map keysym 1008ffa8 to keycode

TRACE[xfpm-button.c:180] xfpm_button_xevent_key(): Grabbed key 213 : ((XfpmButtonKey) BUTTON_HIBERNATE)
TRACE[xfpm-button.c:180] xfpm_button_xevent_key(): Grabbed key 150 : ((XfpmButtonKey) BUTTON_SLEEP)
TRACE[xfpm-button.c:180] xfpm_button_xevent_key(): Grabbed key 73 : ((XfpmButtonKey) BUTTON_MON_BRIGHTNESS_UP)
TRACE[xfpm-button.c:180] xfpm_button_xevent_key(): Grabbed key 72 : ((XfpmButtonKey) BUTTON_MON_BRIGHTNESS_DOWN)
TRACE[xfpm-button.c:180] xfpm_button_xevent_key(): Grabbed key 244 : ((XfpmButtonKey) BUTTON_BATTERY)
TRACE[xfpm-button.c:180] xfpm_button_xevent_key(): Grabbed key 238 : ((XfpmButtonKey) BUTTON_KBD_BRIGHTNESS_UP)
TRACE[xfpm-button.c:180] xfpm_button_xevent_key(): Grabbed key 237 : ((XfpmButtonKey) BUTTON_KBD_BRIGHTNESS_DOWN)
TRACE[xfpm-power.c:210] xfpm_power_check_polkit_auth(): using logind suspend backend
TRACE[xfpm-polkit.c:342] xfpm_polkit_check_auth_intern(): polkit request: (('unix-process', {'pid': <uint32 1616>, 'start-time': <uint64 180874>}), 'org.freedesktop.login1.suspend', @a{ss} {}, uint32 0, '')
TRACE[xfpm-polkit.c:363] xfpm_polkit_check_auth_intern(): Action=org.freedesktop.login1.suspend is authorized=TRUE
TRACE[xfpm-polkit.c:342] xfpm_polkit_check_auth_intern(): polkit request: (('unix-process', {'pid': <uint32 1616>, 'start-time': <uint64 180874>}), 'org.freedesktop.login1.hibernate', @a{ss} {}, uint32 0, '')
TRACE[xfpm-polkit.c:363] xfpm_polkit_check_auth_intern(): Action=org.freedesktop.login1.hibernate is authorized=TRUE
TRACE[xfpm-power.c:1446] xfpm_update_blank_time(): Prev Timeout: 900 / New Timeout: 600
TRACE[xfpm-power.c:1446] xfpm_update_blank_time(): Prev Timeout: 600 / New Timeout: 1200
TRACE[xfpm-manager.c:645] xfpm_manager_inhibit_sleep_systemd(): Inhibiting systemd sleep: handle-power-key:handle-suspend-key:handle-hibernate-key:handle-lid-switch

(xfce4-power-manager:1616): xfce4-power-manager-WARNING **: 13:13:46.162: Unable to set the kernel brightness switch parameter to 0.
TRACE[xfpm-backlight.c:262] xfpm_backlight_brightness_on_ac_settings_changed(): Alarm on ac timeout changed 9
TRACE[xfpm-backlight.c:283] xfpm_backlight_brightness_on_battery_settings_changed(): Alarm on battery timeout changed 9

(xfce4-power-manager:1616): xfce4-power-manager-WARNING **: 13:13:46.172: Failed to get keyboard max brightness level : GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: L’interface « org.freedesktop.UPower.KbdBacklight » n’existe pas pour l’objet à l’emplacement /org/freedesktop/UPower/KbdBacklight

The package dbus and upower are installed.

For now, I'm using keyboard shortcuts in the Keyboard Xfce settings.

xbacklight -inc 10% for XF86MonBrightnessUp

xbacklight -dec 10% for XF86MonBrightnessDown

It works fine but I don't have any notification like I have with the volume keys.

Also I tried with KDE and the brightness keys work by default with the same keyboard layout so I think there is a issue with Xfce.

If you need more information, let me know.

Thanks.