Media, brightness and volume keys don't work with GNOME 3.15.90

did you logout/login after upgrading? if so please attach logs (~/.cache/upstart/gnome-settings-daemon.log)

Hi Tim,

I have to improve the bug description because I don't get this error evertime. If I restart my computer media keys work again but I spend some time working in a session or after suspending the computer they stop working.

It's quite weird.

To increase the weirdness of the issue:
 - Volume slider in g-s top left menu works but the brightness slider doesn't work
 - If I go to Settings->Power the UI got frozen and it takes almost 20 seconds to show the panel. Find below the error output

(gnome-control-center.real:7317): GLib-CRITICAL **: g_variant_get_type: assertion 'value != NULL' failed

(gnome-control-center.real:7317): GLib-CRITICAL **: g_variant_type_is_subtype_of: assertion 'g_variant_type_check (type)' failed

(gnome-control-center.real:7317): GLib-CRITICAL **: g_variant_get_boolean: assertion 'g_variant_is_of_type (value, G_VARIANT_TYPE_BOOLEAN)' failed

(gnome-control-center.real:7317): GLib-CRITICAL **: g_variant_unref: assertion 'value != NULL' failed

Again if I reboot my computer those errors got fixed until some time passes.

does restarting g-s-d (gnome-settings-daemon -r ) fix this also?

and/or gnome-shell (alt+f2 r)?

Tim, I've restarted g-s-d and g-s and that doesn't fix the problem. I have figured out that this problem is only reproducible after resume from suspend.

The only solution for this is restart my computer.

Find below output from restarting g-s-d:

$ gnome-settings-daemon -r 127 ↵

** (gnome-settings-daemon:31910): WARNING **: You can only run one xsettings manager at a time; exiting

** (gnome-settings-daemon:31910): WARNING **: Unable to start gnome_xsettings manager: Could not initialize xsettings manager.

(gnome-settings-daemon:31910): clipboard-plugin-WARNING **: Clipboard manager is already running.

(gnome-settings-daemon:31910): GLib-GObject-WARNING **: cannot register existing type 'GsdDeviceManager'

(gnome-settings-daemon:31910): GLib-CRITICAL **: g_once_init_leave: assertion 'result != 0' failed

(gnome-settings-daemon:31910): common-plugin-CRITICAL **: gsd_device_manager_list_devices: assertion 'GSD_IS_DEVICE_MANAGER (manager)' failed

(gnome-settings-daemon:31910): media-keys-plugin-WARNING **: Failed to set new screen percentage: Timeout was reached

(gnome-settings-daemon:31910): media-keys-plugin-WARNING **: Failed to set new screen percentage: Timeout was reached

(gnome-settings-daemon:31910): media-keys-plugin-WARNING **: Failed to set new screen percentage: Timeout was reached

Latest updates gave new results:

Now after Alt-F2, 'r' in gnome-shell and executing from a terminal 'gnome-settings-daemon -r &' volume, media and brightness keys work again. but keyboard backlight keys don't work yet.

Seeing this here as well, it seems to also affect configured launcher hotkeys (eg ctrl+alt+w mapped to web browser in keyboard shortcuts control panel). I also see it happen before suspending, not sure what triggers it, but some amount of time after the session starts something does...

also closing the laptop lid does not result in suspend anymore -- not sure if that's related?

anyone seen this recently, I hit it a few times earlier, but not since 3.16.0 afaict

I'm still seeing this on 3.16.0 -- it may be triggered by adding/removing a monitor, but not entirely sure

Installed 3.16, rebooted, got this bug after less than an hour of usage. Didn't suspend/resume.

I can reproduce this bug by performing a VT switch:
- Ctrl-Alt-F1 to go away
- Ctrl-Alt-F2 to go back (BTW Ctrl-Alt-F7 gives me a _different_ gdm login screen)
- now keys (I was testing Ctrl+Alt+T, the terminal shortcut) don't work until I apply the workaround from comment 8.

If I run 'journalctl -f' in a terminal and do Ctrl-Alt-F1, Ctrl-Alt-F2, I see this:

Bal 24 11:03:36 platonas gnome-session[2521]: (gnome-settings-daemon:10125): GLib-GObject-WARNING **: cannot register existing type 'GsdDevice'
Bal 24 11:03:36 platonas gnome-session[2521]: (gnome-settings-daemon:10125): GLib-GObject-WARNING **: cannot add private field to invalid (non-instantiatable) type '<invalid>'
Bal 24 11:03:36 platonas gnome-session[2521]: (gnome-settings-daemon:10125): GLib-CRITICAL **: g_once_init_leave: assertion 'result != 0' failed
Bal 24 11:03:36 platonas gnome-session[2521]: (gnome-settings-daemon:10125): common-plugin-CRITICAL **: gsd_device_get_device_type: assertion 'GSD_IS_DEVICE (device)' failed

I now have 7 copies of gnome-settings-daemon running, because each time I do the workaround, I get a new one.

(Note: if I run gnome-settings-daemon -r when it's not hung, the number of running copies does not increase.)

strace shows socket communication (poll, read, write, recvmsg), then when a VT switch happens I see

write(2, "\n(gnome-settings-daemon:15210): "..., 99) = 99
write(2, "\n(gnome-settings-daemon:15210): "..., 131) = 131
write(2, "\n(gnome-settings-daemon:15210): "..., 100) = 100
write(2, "\n(gnome-settings-daemon:15210): "..., 129) = 129

(the assertion error messages), and then some more poll/read/recvmsg and finally

futex(0x7fa34a6ed568, FUTEX_WAIT_PRIVATE, 497, NULL <detached ...>

which never returns ever. Deadlock.

If I run gnome-settings-daemon --debug --replace, then I see these messages after VT switch

(gnome-settings-daemon:16403): wacom-plugin-DEBUG: Removing device 'Power Button' from known devices list

(gnome-settings-daemon:16403): GLib-GObject-WARNING **: cannot register existing type 'GsdDevice'

(gnome-settings-daemon:16403): GLib-GObject-WARNING **: cannot add private field to invalid (non-instantiatable) type '<invalid>'

(gnome-settings-daemon:16403): GLib-CRITICAL **: g_once_init_leave: assertion 'result != 0' failed

(gnome-settings-daemon:16403): common-plugin-CRITICAL **: gsd_device_get_device_type: assertion 'GSD_IS_DEVICE (device)' failed
(gnome-settings-daemon:16403): wacom-plugin-DEBUG: Removing device 'Video Bus' from known devices list

I can confirm this bug. It can be triggered by as little as a VT switch. But I find that restarting g-s-d *does* restore functionality.

I can confirm bug as well. VT switch or screen lock can trigger the bug. Workaround is to restart shell and g-s-d.

I can also confirm the above for a fresh ubuntu gnome 15.04 (x64) install. Happens after only a few minutes.

Recently moved to ArchLinux and this bug doesn't happens.

I'm also experiencing this. Quite frustrating.

I'm on 15.04 and GNOME 3.16 with the gnome3-team and gnome3-staging PPA's.

Only thing to add this message in terminal every time I hit the non functional brightness keys:

(gnome-settings-daemon:13855): media-keys-plugin-WARNING **: No existing D-Bus connection trying to handle power keys

Status changed to 'Confirmed' because the bug affects multiple users.

Its not entirely clear from the comments, but has anyone hit this on stock 15.04 (i.e. without gnome3-staging PPA)

Sorry, we don't support fixing bugs from PPAs.

Alberto, please don't do that, the gnome3-team PPA's are the official staging area for the Ubuntu GNOME team, These packages will soon enough be in Wily and the bug will only follow if not fixed. Reopening...

Okay, but then tag it as affecting the Wily Wonka.

Same issue since my Ubuntu 15.04 restarded from suspended mode. It disappeared after shutdown and a restart.

This does not seem to occur in GNOME on Wayland, only in the default shell.

Bastien Nocera was able to track this down to the same problem in https://bugzilla.gnome.org/show_bug.cgi?id=747745 affecting gnome-settings-daemon 3.16.2-0ubuntu1~vivid1.

I tried rebuilding gnome-settings-daemon from the ppa sources, but deleted all the debian/patches files. then restarted gnome-settings-daemon and gnome-shell, but still had the same problem with keyboard shortcuts not working (and actually it didn't fix itself with a gsd/gnome-shell restart until i reinstalled the ppa package directly). I may not be doing things correctly though.

Every time I press one of these keys, I get the message

(gnome-settings-daemon:7822): GLib-GIO-WARNING **: Dropping signal AcceleratorActivated of type (ua{sv}) since the type from the expected interface is (uuu)

This is probably the same thing that happened in LP: #1217196 and LP: #1376471.

Specifically, this is caused because gnome-shell 3.16 has
https://git.gnome.org/browse/gnome-shell/commit/?id=2aa4fb02dd9c568038d12fe609252b6934367e76

but gnome-settings-daemon 3.14 does not have
https://git.gnome.org/browse/gnome-settings-daemon/commit/?id=46525602364088398eeb3a98d7bcfa64deeddd4e

Here’s a tested patch that reverts the relevant gnome-shell changes to make it work with gnome-settings-daemon 3.14.x.

The attachment "gnome-shell_3.16.2-1ubuntu1_lp1427877.debdiff" seems to be a debdiff. The ubuntu-sponsors team has been subscribed to the bug report so that they can review and hopefully sponsor the debdiff. If the attachment isn't a patch, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are member of the ~ubuntu-sponsors, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issue please contact him.]

Anders, thanks for the patch, I'll upload it even though we should get g-s-d/g-c-c updated in the next week or so.

However just to note that issue is not the same as this bug, which is related to media keys stop working after suspend of VT switch, that itself seems to be caused by g-s-d 3.16, but havent yet tracked down the cause.

I think Tim is taking care of this - unsubscribing the main Ubuntu sponsors but add us back if necessary.

"I tried rebuilding gnome-settings-daemon from the ppa sources, but deleted all the debian/patches files. then restarted gnome-settings-daemon and gnome-shell, but still had the same problem with keyboard shortcuts not working"

I did the same thing, but no luck. Maybe we have to rebuilt other packages without Debian related patches as well? Any hints or suggestions are appreciated.

Please see the updated conversation in the gnome Bugtracker. I looks like this a thing related to compilation and/or linking flags in Ubuntu, since in a vanilla gsd I cannot reproduce the issue.

Please see the updated conversation in the gnome Bugtracker.

For me I looks like this a thing related to (d/p/revert-gsettings-removals.patch: Refreshed), because if I disable the wacom plugin..

sudo mv /usr/lib/gnome-settings-daemon-3.0/wacom.gnome-settings-plugin /usr/lib/gnome-settings-daemon-3.0/.wacom.gnome-settings-plugin.bak

gsd works as expected again. (yay!)

@Joe can you confirm?

I don't why we didn't catch that earlier. Is it the case the patches are already applied in the source I download with `apt-get source gnome-settings-daemon` and I have to revert the manually? I thought it would suffice to delete all patches in debian/patches directory.

Also in the patch there is a reference to (" plugins/power/gsd-power-manager.c | 32 +++++++++++++++++"), but the actual change is not there.

my initial tests show that disbling the wacom plugin fixes the issue with hotkeys, volume keys, and even brightness keys (previously even the restart didn't fix brightness keys for me even though it fixed hotkeys and volume keys).

Hubert, thanks for digging into this.

On 26/06/15 22:35, Hubert Hesse wrote:
> Please see the updated conversation in the gnome Bugtracker.
>
> For me I looks like this a thing related to (d/p/revert-gsettings-
> removals.patch: Refreshed), because if I disable the wacom plugin..
The g-s-d schemas are shared with unity-settings-daemon, this patch just brings back keys that are needed by u-s-d, they will simply be unused
in g-s-d and won't cause any problem.
>
>
> sudo mv /usr/lib/gnome-settings-daemon-3.0/wacom.gnome-settings-plugin /usr/lib/gnome-settings-daemon-3.0/.wacom.gnome-settings-plugin.bak
>
>
> gsd works as expected again. (yay!)
input device management moved into mutter for 3.16, perhaps mutter is supposed to handle the device removal?
>
>
> I don't why we didn't catch that earlier. Is it the case the patches are already applied in the source I download with `apt-get source gnome-settings-daemon` and I have to revert the manually? I thought it would suffice to delete all patches in debian/patches directory.
yes they will be applied via quilt. you just need to do:
quilt pop -a
rm debian/patches
debuild -S
>
> Also in the patch there is a reference to (" plugins/power/gsd-power-
> manager.c | 32 +++++++++++++++++"), but the actual
> change is not there.
thats harmless its just patch headers don't get updated when doing a `quilt refresh` to rebase patches

Hubert, Also I wonder if you are looking in the wrong place, might be better to try and track down the GsdDeviceManager error first:
(gnome-settings-daemon:13665): GLib-GObject-WARNING **: cannot register existing type 'GsdDeviceManager'

Both xrandr and wacom use this device manager, the first call to gsd_device_manager_get() should create the object and subsequent calls should return the existing object, however it appears to try and create it a second time.

disabling the wacom plugin just avoids that second (attemted) invocation.

I had a poke around in gdb, for some reason type info doesn't seem to be shared between plugins, so the second plugin to load will try and reregister the types.

This was caused by linking with -Wl, -BSymbolic-functions, I think its ok to just strip this linker flag, afaik no other distro's even use it.

Should be fixed with gnome-settings-daemon_3.16.2-0ubuntu1~vivid2, just uploaded to gnome3-staging

gnome-settings-daemon_3.16.2-0ubuntu1~vivid2 fixed the bug for me. Tested attaching attaching/detaching a monitor, lock/unlocking the screen, and suspend/resume cases.

Hey there Tim

thanks for the fix.
1) Was that a regression and you saw some kind a delta to the previous version? Is that possible?
Thats one think I wished for while I was debugging
2) Since this is runtime, there should be some kind of integration test, correct? If so how do write one so similar incidents happen again

Hi Hubert,

1) no not really, its just that gnome-settings-daemon never had any shared objects previously, so the link flags never caused a problem. I just poked around in gdb to find the problem. You obviously can get diffs to the previous versions via git, but that wouldn't have helped much in this case!

2) I have no idea, its a pretty tricky case to test for, however I suppose you could check that the pointers for the Gtypes match up between modules, however thats all kind of wrapped up in glib ( I had to cross into glib to code to work that out) so may not work in a test case.

3) if you want to work on some more Ubuntu GNOME stuff, I can point you in that direction, ping me on IRC or email.

Just leaving a comment that I am still suffering from this problem described in the title under Gnome-shell 3.16.4. After a while the sound buttons (and only the sound buttons) stop working. None of the other issues that are described as related above (Light not working from the menu, or the delay in loading the Power settings) apply, just the sound buttons.
Doing Alt-F2 + r fixes the problem (at least for a while).

als also still experiencing this behaviour