DpmsInhibitor is not applicable. May make the system crash on suspend #62

carlocastoldi · 2021-04-01T12:59:12Z

DpmsInhibitor not being applicable is a problem in both with v3.5.1 and the git version.

This is my output in v3.5.1:

/usr/lib/python3.9/site-packages/caffeine/main.py:61: PyGIWarning: AppIndicator3 was imported without specifying a version first. Use gi.require_version('AppIndicator3', '0.1') before import to ensure that the right version gets loaded.
  from gi.repository import AppIndicator3
INFO:caffeine.core:Caffeine is starting up...
INFO:caffeine.core:Audio playback detected (spotify). Inhibiting.
INFO:caffeine.core:GnomeInhibitor is applicable, state: True
INFO:caffeine.core:XorgInhibitor is applicable, state: True
INFO:caffeine.core:XdgScreenSaverInhibitor is applicable, state: False
server does not have extension for +dpms option
INFO:caffeine.core:DpmsInhibitor is applicable, state: False
INFO:caffeine.core:

server does not have extension for +dpms option is spammed in the console and journalctl with the git version.

Additionally the last time the system suspended I could no longer access my pc neither in GUI nor in tty.
I am not sure if caffeine (git version) is related to it, but the following is its last output i have in journalctl a few minutes before the suspension of my pc, but after the system was blocked and the screen blacked out :

apr 01 13:30:38 thinkpad-t480 caffeine.desktop[39135]: server does not have extension for -dpms option
apr 01 13:30:48 thinkpad-t480 caffeine.desktop[39184]: server does not have extension for +dpms option
apr 01 13:30:58 thinkpad-t480 caffeine.desktop[30468]: Traceback (most recent call last):
apr 01 13:30:58 thinkpad-t480 caffeine.desktop[30468]:   File "/usr/lib/python3.9/site-packages/caffeine/core.py", line 131, in run_all_triggers
apr 01 13:30:58 thinkpad-t480 caffeine.desktop[30468]:     self.apply_desired_status(show_notification)
apr 01 13:30:58 thinkpad-t480 caffeine.desktop[30468]:   File "/usr/lib/python3.9/site-packages/caffeine/core.py", line 271, in apply_desired_status
apr 01 13:30:58 thinkpad-t480 caffeine.desktop[30468]:     inhibitor.set(inhibit_screen)
apr 01 13:30:58 thinkpad-t480 caffeine.desktop[30468]:   File "/usr/lib/python3.9/site-packages/caffeine/inhibitors.py", line 46, in set
apr 01 13:30:58 thinkpad-t480 caffeine.desktop[30468]:     self.uninhibit()
apr 01 13:30:58 thinkpad-t480 caffeine.desktop[30468]:   File "/usr/lib/python3.9/site-packages/caffeine/inhibitors.py", line 83, in uninhibit
apr 01 13:30:58 thinkpad-t480 caffeine.desktop[30468]:     self.__proxy.Uninhibit(self.__cookie)
apr 01 13:30:58 thinkpad-t480 caffeine.desktop[30468]:   File "/usr/lib/python3.9/site-packages/dbus/proxies.py", line 141, in __call__
apr 01 13:30:58 thinkpad-t480 caffeine.desktop[30468]:     return self._connection.call_blocking(self._named_service,
apr 01 13:30:58 thinkpad-t480 caffeine.desktop[30468]:   File "/usr/lib/python3.9/site-packages/dbus/connection.py", line 652, in call_blocking
apr 01 13:30:58 thinkpad-t480 caffeine.desktop[30468]:     reply_message = self.send_message_with_reply_and_block(
apr 01 13:30:58 thinkpad-t480 caffeine.desktop[30468]: dbus.exceptions.DBusException: org.gnome.SessionManager.GeneralError: Unable to uninhibit: Invalid cookie

distro: Manjaro Linux
DE: GNOME 40 on Wayland

EDIT: i tried to trigger suspension again with caffeine (git version) while playing music.
While caffeine still couldn't prevent the pc from suspending and reported the same error i reported above, I could get the control of the system back both in gui and tty.

The text was updated successfully, but these errors were encountered:

carlocastoldi · 2021-04-01T14:45:47Z

I am sorry. This must be related to the fact that i am on Wayland and caffeine doesn't officially support it.

I close the issue

carlocastoldi · 2021-04-01T14:50:18Z

#44 apparently managed to make it work on wayland, though.
Could this me due to GNOME 40?

carlocastoldi · 2021-04-01T15:13:19Z

Probably using a similare command to the following could solve the issue for Wayland users, preventing the screen from dimming on GNOME.
gsettings set org.gnome.settings-daemon.plugins.power idle-dim false

We should see what's the command on KDE Wayland.
I suspect this is the line causing the issue because it assume Xorg is running:
https://github.com/caffeine-ng/caffeine-ng/blob/2972c04f57cbf59daf097e3535dc52d3bfb3e41f/caffeine/inhibitors.py#L181

I reopen the issue in hope to have a discussion.

WhyNotHugo · 2021-04-07T20:18:53Z

I'm very confused by this:

apr 01 13:30:58 thinkpad-t480 caffeine.desktop[30468]: Traceback (most recent call last):
apr 01 13:30:58 thinkpad-t480 caffeine.desktop[30468]:   File "/usr/lib/python3.9/site-packages/caffeine/core.py", line 131, in run_all_triggers
apr 01 13:30:58 thinkpad-t480 caffeine.desktop[30468]:     self.apply_desired_status(show_notification)
apr 01 13:30:58 thinkpad-t480 caffeine.desktop[30468]:   File "/usr/lib/python3.9/site-packages/caffeine/core.py", line 271, in apply_desired_status
apr 01 13:30:58 thinkpad-t480 caffeine.desktop[30468]:     inhibitor.set(inhibit_screen)
apr 01 13:30:58 thinkpad-t480 caffeine.desktop[30468]:   File "/usr/lib/python3.9/site-packages/caffeine/inhibitors.py", line 46, in set
apr 01 13:30:58 thinkpad-t480 caffeine.desktop[30468]:     self.uninhibit()
apr 01 13:30:58 thinkpad-t480 caffeine.desktop[30468]:   File "/usr/lib/python3.9/site-packages/caffeine/inhibitors.py", line 83, in uninhibit
apr 01 13:30:58 thinkpad-t480 caffeine.desktop[30468]:     self.__proxy.Uninhibit(self.__cookie)
apr 01 13:30:58 thinkpad-t480 caffeine.desktop[30468]:   File "/usr/lib/python3.9/site-packages/dbus/proxies.py", line 141, in __call__
apr 01 13:30:58 thinkpad-t480 caffeine.desktop[30468]:     return self._connection.call_blocking(self._named_service,
apr 01 13:30:58 thinkpad-t480 caffeine.desktop[30468]:   File "/usr/lib/python3.9/site-packages/dbus/connection.py", line 652, in call_blocking
apr 01 13:30:58 thinkpad-t480 caffeine.desktop[30468]:     reply_message = self.send_message_with_reply_and_block(
apr 01 13:30:58 thinkpad-t480 caffeine.desktop[30468]: dbus.exceptions.DBusException: org.gnome.SessionManager.GeneralError: Unable to uninhibit: Invalid cookie

I wonder if Gnome changed something on their API and those cookies now expire or something. caffeine stores the cookie that Gnome returns. :/

WhyNotHugo · 2021-04-07T20:21:43Z

Probably using a similare command to the following could solve the issue for Wayland users, preventing the screen from dimming on GNOME.
gsettings set org.gnome.settings-daemon.plugins.power idle-dim false

Makes sense. Do you know how to determine if this is applicable or not?

I suspect this is the line causing the issue because it assume Xorg is running:
https://github.com/caffeine-ng/caffeine-ng/blob/2972c04f57cbf59daf097e3535dc52d3bfb3e41f/caffeine/inhibitors.py#L181

Yes, that's causing the extra logging. Looks like applicable is not defined for DpmsInhibitor. I think it should call xset to determine if X is running and supports dpms.

carlocastoldi · 2021-04-26T10:24:38Z

Makes sense. Do you know how to determine if this is applicable or not?

I didn't like that solution very much tbh. Lately I tried to search for some kind of standards between all DEs & compositors. I found the following 2 options:

idle-inhibit, a Wayland unstable protocol. It's worth saying that pretty much every wayland protocol is "unstable".
A relatively new xdg portal

I wrote two simple tests. But please: bear in mind that I have never programmed with Gtk nor with dbus. These results could very much depend on that (especially the one that uses dbus).

I tired to run the tests on GNOME & KDE.

Wayland protocol

GTK supports the wayland protocol since this MR. My test appear to work on GNOME-Wayland.
On GNOME-X11 and KDE it seems not to. I don't know who's fault is that: Kwin? My test? Gtk implementation being mutter-specific?
Additionally i found the following MR for mutter. It's still open. And i cannot properly understand it.

Portals

The xdg-portal test, instead, doesn't seem to work on GNOME. With dbus_monitor I see the following activity:

At line 1172 of this dbus-monitor.log


method call time=1619301285.710432 sender=:1.94 -> destination=:1.149 serial=280 path=/org/freedesktop/portal/desktop; interface=org.freedesktop.impl.portal.Inhibit; member=Inhibit
   object path "/org/freedesktop/portal/desktop/request/1_167/t"
   string ""
   string "org.gtk.TestApp"
   uint32 15
   array [
      dict entry(
         string "reason"
         variant             string "Testing xdg-portal inhibition!"
      )
   ]
method call time=1619301285.711080 sender=:1.149 -> destination=:1.13 serial=140 path=/org/gnome/SessionManager; interface=org.gnome.SessionManager; member=Inhibit
   string ""
   uint32 0
   string "Testing xdg-portal inhibition!"
   uint32 15
method return time=1619301285.711151 sender=:1.149 -> destination=:1.94 serial=141 reply_serial=280
error time=1619301285.711594 sender=:1.13 -> destination=:1.149 error_name=org.gnome.SessionManager.GeneralError reply_serial=140
   string "Application ID not specified"
signal time=1619301285.711639 sender=:1.94 -> destination=:1.167 serial=281 path=/org/freedesktop/portal/desktop/request/1_167/t; interface=org.freedesktop.portal.Request; member=Response
   uint32 0
   array [
   ]
method call time=1619301286.241677 sender=:1.167 -> destination=:1.94 serial=7 path=/org/freedesktop/portal/desktop/request/1_167/t; interface=org.freedesktop.portal.Request; member=Close
method call time=1619301286.242749 sender=:1.94 -> destination=:1.149 serial=282 path=/org/freedesktop/portal/desktop/request/1_167/t; interface=org.freedesktop.impl.portal.Request; member=Close
method return time=1619301286.243680 sender=:1.149 -> destination=:1.94 serial=142 reply_serial=282
method return time=1619301286.244565 sender=:1.94 -> destination=:1.167 serial=283 reply_serial=7

Even with /lib/xdg-desktop-portal-gtk --replace --verbose I get a Application ID not specified error, although i think i did.

On KDE it seems to work on both X11 and Wayland!

xdp-kde-inhibit: Inhibit called with parameters:
xdp-kde-inhibit:     handle:  "/org/freedesktop/portal/desktop/request/1_97/t"
xdp-kde-inhibit:     app_id:  ""
xdp-kde-inhibit:     window:  "org.gtk.Example"
xdp-kde-inhibit:     flags:  15
xdp-kde-inhibit:     options:  QMap(("reason", QVariant(QString, "Testing xdg-portal inhibition!")))
xdp-kde-request: "org.freedesktop.impl.portal.Request"
xdp-kde-request: "Close"
xdp-kde-request: "/org/freedesktop/portal/desktop/request/1_97/t"

Unfortunately, tho, as soon as I click the button to toggle-off the inhibition in kde, the app crashes. I don't know why :/
Sure is that it manages to disable the inhibition before crashing!

Conclusions

Finally I think that we should try to go for the portal implementation as that seems like the most long-lasting protocol and it appears to be designed directly for applications. I can see it establishing between all DEs in the near future. Plus it's a start to properly package caffeine-ng with flatpak!
In order to do that I would need your help. As I said earlier I've no experience with Gtk/dbus and, before filing an issue upstream I would like to have a double checkfrom you on the tests I wrote and a brief discussion on the approach. Could you please help me with that? ^^

I suspect this is the line causing the issue because it assume Xorg is running:
https://github.com/caffeine-ng/caffeine-ng/blob/2972c04f57cbf59daf097e3535dc52d3bfb3e41f/caffeine/inhibitors.py#L181

Yes, that's causing the extra logging. Looks like applicable is not defined for DpmsInhibitor. I think it should call xset to determine if X is running and supports dpms.

Oh yeah, that makes sense!

carlocastoldi · 2021-04-26T13:09:30Z

Fyi this is a good read: https://arnaudr.io/2020/09/25/inhibit-suspending-the-computer-with-gtkapplication/

He suggests using gtk_application_inhibit(), tho. Seems like it should work everywhere apart from XFCE because they're using a deprecated API. It would be extremely good if we could use only that interface as it would simplify enormously inhibitors.py.
In all fairness, tho, i think i tried to use gtk_application_inhibit() through the python API in my first test, but it didn't work on my KDE desktop and GNOME-X11. It could all be due to the version of Gtk API i used tho. I don't really know

carlocastoldi · 2022-03-11T13:24:45Z

Good news! After almost a year my work in order to use portals (which I think it's drawing to become the new standard cross-DEs, also thanks to wayland) in order to inhibit suspension for un-sendboxed application is completed!

KDE fixed a bug where their frontend implementation didn't work properly [bug 436453]
and today the portal backend accepted, improved & merged my request for allowing to make certain portal calls (including Inhibit()) complete for un-sendboxed applications. This means that my demo works with GNOME as well—which is a bit picky about who's allowed to inhibit the session [bug 579]

What do you think about going forward with this idea, @WhyNotHugo? I could also see this as an option for having less inhibitors, since Portals are becoming really widespread across all the linux desktop

WhyNotHugo · 2022-07-05T20:14:25Z

Original issue is now fixed on master via f2c0bac

WhyNotHugo · 2022-07-05T20:34:12Z

Regarding direction: I'm thinking of addressing the Wayland support so I can use caffeine on swaywm. I've mentioned in the past that I haven't been really using caffeine, and Wayland support would put caffeine back in the "things I use" list.

Portal support would be very welcome too. A few inhibitors use dbus, they are a useful reference, e.g.:

https://github.com/caffeine-ng/caffeine-ng/blob/b7deb6e98623a0d6ee8218fae6b9c2f930caefb7/caffeine/inhibitors.py#L146-L161

d-feet is also very handy when experimenting simple d-bus method calls.

WhyNotHugo · 2022-11-06T14:28:42Z

This project has moved to codeberg.

Follow-up for this issue is at https://codeberg.org/WhyNotHugo/caffeine-ng/issues/62

carlocastoldi closed this as completed Apr 1, 2021

carlocastoldi reopened this Apr 1, 2021

WhyNotHugo closed this as completed Nov 6, 2022

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DpmsInhibitor is not applicable. May make the system crash on suspend #62

DpmsInhibitor is not applicable. May make the system crash on suspend #62

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DpmsInhibitor is **not** applicable. May make the system crash on suspend #62

DpmsInhibitor is **not** applicable. May make the system crash on suspend #62

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carlocastoldi commented Apr 26, 2021

Wayland protocol

Portals

Conclusions

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DpmsInhibitor is not applicable. May make the system crash on suspend #62

DpmsInhibitor is not applicable. May make the system crash on suspend #62

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