Multi-seat freezes on resume for sleep in Kubuntu 24.04

[James Maggs]

Hello

I have a fresh install of Kubuntu 24.04 and I am having problems resuming from sleep. Here is the output of 'lsb_release -rd'.

Description: Ubuntu 24.04 LTS
Release: 24.04

My system is fully up to date as of today. I am very unsure which package is the issue.

Steps to reproduce:

1. Set up multi-seat using loginctl. I have two seats set up with separate graphics cards. One is an nvidia GT710 the other and onboard intel graphics (i915 driver). For the nvidia graphics card I have tried the 470 drivers installed using ubuntu-drivers and the nouveau driver and it makes no difference.
2. Start up the sytem.
3. Send the system to sleep.
4. Press a key to resume from sleep.
5. What happens is that the screens come back on and for a fraction of a second I can move the mouse pointer, then everything freezes completely. The only think I can do from here is a hard reset.
6. I tried switching from sddm to lightdm and the behaviour is identical, so I'm guessing it's not the display manager that's at fault.

What I expected to happen: normal resume from sleep.

I also have Mint 21.3 installed and it does not suffer this issue, so I'm thinking it's not a hardware issue. I do wonder if it's an issue with the kernel.

Far below are last few lines from running 'journalctl -o short-precise -k -b -1'. I am no expert but it seems to me like there are no entries after the suspend.

I did also notice that the system froze a few other times at less predictable times since installing, but I'm not sure if that is related or not.

Many thanks for your help!

Jun 23 17:56:48.914019 jamaggs-desktop kernel: nouveau 0000:01:00.0: DRM: VRAM: 2048 MiB
Jun 23 17:56:48.914191 jamaggs-desktop kernel: nouveau 0000:01:00.0: DRM: GART: 1048576 MiB
Jun 23 17:56:48.914393 jamaggs-desktop kernel: nouveau 0000:01:00.0: DRM: TMDS table version 2.0
Jun 23 17:56:48.914591 jamaggs-desktop kernel: nouveau 0000:01:00.0: DRM: MM: using COPY for buffer copies
Jun 23 17:56:48.914837 jamaggs-desktop kernel: usb 1-1.4.3: Found UVC 1.00 device Logitech Webcam C925e (046d:085b)
Jun 23 17:56:48.915090 jamaggs-desktop kernel: snd_hda_intel 0000:01:00.1: bound 0000:01:00.0 (ops nv50_audio_component_bind_ops [nouveau])
Jun 23 17:56:48.916212 jamaggs-desktop kernel: [drm] Initialized nouveau 1.4.0 20120801 for 0000:01:00.0 on minor 0
Jun 23 17:56:48.990282 jamaggs-desktop kernel: fbcon: nouveaudrmfb (fb0) is primary device
Jun 23 17:56:48.990371 jamaggs-desktop kernel: fbcon: Deferring console take-over
Jun 23 17:56:48.990423 jamaggs-desktop kernel: nouveau 0000:01:00.0: [drm] fb0: nouveaudrmfb frame buffer device
Jun 23 17:56:55.334208 jamaggs-desktop kernel: EXT4-fs (dm-1): mounted filesystem 70b377ac-79e2-475c-b3f7-041db5044cfc r/w with ordered data mode. Quota mode: none.
Jun 23 17:56:56.304205 jamaggs-desktop kernel: BTRFS: device fsid f36513a1-4156-4a6d-8d4c-abb0d717d555 devid 1 transid 1253 /dev/mapper/IntBackup scanned by mount (720)
Jun 23 17:56:56.304278 jamaggs-desktop kernel: BTRFS info (device dm-2): first mount of filesystem f36513a1-4156-4a6d-8d4c-abb0d717d555
Jun 23 17:56:56.304303 jamaggs-desktop kernel: BTRFS info (device dm-2): using crc32c (crc32c-intel) checksum algorithm
Jun 23 17:56:56.304332 jamaggs-desktop kernel: BTRFS info (device dm-2): using free-space-tree
Jun 23 17:56:56.776213 jamaggs-desktop kernel: audit: type=1400 audit(1719161816.774:2): apparmor="STATUS" operation="profile_load" profile="unconfined" name="QtWebEngineProcess" pid=764 comm="apparm>
Jun 23 17:56:56.776273 jamaggs-desktop kernel: audit: type=1400 audit(1719161816.774:3): apparmor="STATUS" operation="profile_load" profile="unconfined" name=4D6F6E676F444220436F6D70617373 pid=763 co>
Jun 23 17:56:56.776290 jamaggs-desktop kernel: audit: type=1400 audit(1719161816.774:4): apparmor="STATUS" operation="profile_load" profile="unconfined" name="Discord" pid=762 comm="apparmor_parser"
Jun 23 17:56:56.776304 jamaggs-desktop kernel: audit: type=1400 audit(1719161816.774:5): apparmor="STATUS" operation="profile_load" profile="unconfined" name="1password" pid=761 comm="apparmor_parser"
Jun 23 17:56:56.777413 jamaggs-desktop kernel: audit: type=1400 audit(1719161816.775:6): apparmor="STATUS" operation="profile_load" profile="unconfined" name="brave" pid=765 comm="apparmor_parser"
Jun 23 17:56:56.777443 jamaggs-desktop kernel: audit: type=1400 audit(1719161816.776:7): apparmor="STATUS" operation="profile_load" profile="unconfined" name="busybox" pid=767 comm="apparmor_parser"
Jun 23 17:56:56.777477 jamaggs-desktop kernel: audit: type=1400 audit(1719161816.776:8): apparmor="STATUS" operation="profile_load" profile="unconfined" name="buildah" pid=766 comm="apparmor_parser"
Jun 23 17:56:56.777499 jamaggs-desktop kernel: audit: type=1400 audit(1719161816.776:9): apparmor="STATUS" operation="profile_load" profile="unconfined" name="cam" pid=768 comm="apparmor_parser"
Jun 23 17:56:56.779936 jamaggs-desktop kernel: audit: type=1400 audit(1719161816.777:10): apparmor="STATUS" operation="profile_load" profile="unconfined" name="ch-checkns" pid=769 comm="apparmor_pars>
Jun 23 17:56:56.779973 jamaggs-desktop kernel: audit: type=1400 audit(1719161816.777:11): apparmor="STATUS" operation="profile_load" profile="unconfined" name="ch-run" pid=770 comm="apparmor_parser"
Jun 23 17:57:07.172279 jamaggs-desktop kernel: kauditd_printk_skb: 115 callbacks suppressed
Jun 23 17:57:07.172352 jamaggs-desktop kernel: audit: type=1400 audit(1719161827.170:127): apparmor="STATUS" operation="profile_replace" info="same as current profile, skipping" profile="unconfined" >
Jun 23 17:57:07.259215 jamaggs-desktop kernel: NET: Registered PF_QIPCRTR protocol family
Jun 23 17:57:07.585216 jamaggs-desktop systemd-fstab-generator[1070]: Mount point none is not a valid path, ignoring.
Jun 23 17:57:08.189210 jamaggs-desktop kernel: fbcon: Taking over console
Jun 23 17:57:08.205109 jamaggs-desktop kernel: Console: switching to colour frame buffer device 320x67
Jun 23 17:57:08.418276 jamaggs-desktop kernel: audit: type=1400 audit(1719161828.416:128): apparmor="DENIED" operation="capable" class="cap" profile="/usr/sbin/cupsd" pid=1082 comm="cupsd" capability>
Jun 23 17:57:11.581356 jamaggs-desktop kernel: e1000e 0000:00:19.0 eno1: NIC Link is Up 1000 Mbps Full Duplex, Flow Control: None
Jun 23 17:57:12.132714 jamaggs-desktop kernel: audit: type=1400 audit(1719161832.129:129): apparmor="DENIED" operation="capable" class="cap" profile="/usr/sbin/cupsd" pid=1183 comm="serial" capabilit>
Jun 23 17:57:12.160355 jamaggs-desktop kernel: usblp3: removed
Jun 23 17:57:12.162305 jamaggs-desktop kernel: usblp 1-1.6:1.0: usblp3: USB Bidirectional printer dev 6 if 0 alt 0 proto 2 vid 0x03F0 pid 0x2C17
Jun 23 17:57:20.849222 jamaggs-desktop kernel: usb 1-1.4.3: reset high-speed USB device number 10 using ehci-pci
Jun 23 17:57:27.000222 jamaggs-desktop kernel: PM: suspend entry (deep)

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Libera.chat.

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[James Maggs (jamaggs)]

Hello

Just to note I tried to install xubuntu 24.04 today and it was exactly the same.

Many thanks

James