Hi,
Strange thing, always using Gnome on my laptop but since 43 version the brightness slider on the top right menu has disappeared. I can only see the Volume slider now.
Any suggestions?
Thanks
What is the output of gdbus call --session --dest org.gnome.SettingsDaemon.Power --object-path /org/gnome/SettingsDaemon/Power --method org.freedesktop.DBus.Properties.Get org.gnome.SettingsDaemon.Power.Screen Brightness?
This one:
reckor@migt ~ $ gdbus call --session --dest org.gnome.SettingsDaemon.Power --object-path /org/gnome/SettingsDaemon/Power --method org.freedesktop.DBus.Properties.Get org.gnome.SettingsDaemon.Power.Screen Brightness
(<-1>,)
That means that gsd-power did not find a usable backlight.
Running
$ /usr/libexec/gsd-power --verbose
in a terminal may provide some insight about the reason.
Thanks, here it goes.
Blockquote
reckor@migt ~ $ /usr/libexec/gsd-power --verbose
(gsd-power:39766): GLib-DEBUG: 18:27:26.235: unsetenv() is not thread-safe and should not be used after threads are created
(gsd-power:39766): power-plugin-DEBUG: 18:27:26.235: Starting power manager
(gsd-power:39766): GLib-GIO-DEBUG: 18:27:26.235: Using cross-namespace EXTERNAL authentication (this will deadlock if server is GDBus < 2.73.3)
(gsd-power:39766): dconf-DEBUG: 18:27:26.250: watch_fast: “/org/gnome/settings-daemon/plugins/power/” (establishing: 0, active: 0)
(gsd-power:39766): dconf-DEBUG: 18:27:26.250: watch_fast: “/org/gnome/desktop/screensaver/” (establishing: 0, active: 0)
(gsd-power:39766): dconf-DEBUG: 18:27:26.250: watch_fast: “/org/gnome/desktop/session/” (establishing: 0, active: 0)
(gsd-power:39766): dconf-DEBUG: 18:27:26.250: watch_established: “/org/gnome/settings-daemon/plugins/power/” (establishing: 1)
(gsd-power:39766): dconf-DEBUG: 18:27:26.251: watch_established: “/org/gnome/desktop/screensaver/” (establishing: 1)
(gsd-power:39766): dconf-DEBUG: 18:27:26.251: watch_established: “/org/gnome/desktop/session/” (establishing: 1)
(gsd-power:39766): power-plugin-DEBUG: 18:27:26.251: Registered client at path /org/gnome/SessionManager/Client25
(gsd-power:39766): power-plugin-DEBUG: 18:27:26.252: bus_acquired_cb: acquired bus 0x560fcce6ba20 for name org.gnome.SettingsDaemon.Power
(gsd-power:39766): power-plugin-DEBUG: 18:27:26.253: name_lost_cb: lost name org.gnome.SettingsDaemon.Power on bus 0x560fcce6ba20
(gsd-power:39766): power-plugin-DEBUG: 18:27:26.264: Output 0: external, backlight -1
(gsd-power:39766): power-plugin-DEBUG: 18:27:26.264: Output 1: builtin, backlight -1
(gsd-power:39766): power-plugin-DEBUG: 18:27:26.267: Output 0: external, backlight -1
(gsd-power:39766): power-plugin-DEBUG: 18:27:26.267: Output 1: builtin, backlight -1
(gsd-power:39766): power-plugin-DEBUG: 18:27:26.267: No usable backlight found.
(gsd-power:39766): power-plugin-DEBUG: 18:27:26.267: Adding suspend delay inhibitor
(gsd-power:39766): power-plugin-DEBUG: 18:27:26.267: Screen configuration changed
(gsd-power:39766): power-plugin-DEBUG: 18:27:26.267: Syncing lid inhibitor and grabbing it temporarily
(gsd-power:39766): power-plugin-DEBUG: 18:27:26.267: Adding lid switch system inhibitor
(gsd-power:39766): power-plugin-DEBUG: 18:27:26.267: restarting lid close safety timer
(gsd-power:39766): power-plugin-DEBUG: 18:27:26.267: setting up lid close safety timer
(gsd-power:39766): power-plugin-DEBUG: 18:27:26.271: setting up sleep callback 900s
(gsd-power:39766): power-plugin-DEBUG: 18:27:26.271: TESTSUITE: Unblanked screen
(gsd-power:39766): power-plugin-DEBUG: 18:27:26.285: System inhibitor fd is 15
(gsd-power:39766): power-plugin-DEBUG: 18:27:26.300: System inhibitor fd is 16
(gsd-power:39766): power-plugin-DEBUG: 18:27:34.840: stopping lid close safety timer
Mmh, unfortunately that doesn’t really show anything new.
It means that no backlight device was found via logind/udev, and the fallback to mutter/xrandr doesn’t turn up any output devices with backlight support either.
Thanks, I moved to Wayland now just fyi (xrandr is helpless). But either way that is a very weird bug. Before 43 it was working properly. I will check other stuff too
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