Package: lightdm Version: 1.32.0-6+b1 Severity: normal X-Debbugs-Cc: 10dma...@gmail.com
Hello, the issue is blocked alsa audio on login to desktop, audio playback attempts of various programs fail with error messages: * "unable to create IPC semaphore" and * "ALSA: Couldn't open audio device: Permission denied" example: aplay /usr/share/sounds/alsa/Noise.wav ALSA lib pcm_direct.c:2178:(_snd_pcm_direct_new) unable to create IPC semaphore aplay: main:850: audio open error: Permission denied the problem appeared on 04.03.2024, probably on first system boot after "aptitude safe-upgrade" from previous day. I noticed lightdm is using alsa ipc key: cat /usr/share/alsa/alsa.conf | grep ipc_ defaults.pcm.ipc_key 5678293 defaults.pcm.ipc_gid audio defaults.pcm.ipc_perm 0660 note: 5678293 == 0x0056a4d5 == == ipcs before login to desktop == ------ Message Queues -------- key msqid owner perms used-bytes messages ------ Shared Memory Segments -------- key shmid owner perms bytes nattch status 0x0056a4d5 0 lightdm 660 488 1 0x0056a4d6 1 lightdm 660 131072 1 0x00000000 5 lightdm 600 524288 2 dest ------ Semaphore Arrays -------- key semid owner perms nsems 0x0056a4d5 0 lightdm 660 1 == == ipcs when logged in to desktop, audio playback is blocked == ------ Message Queues -------- key msqid owner perms used-bytes messages ------ Shared Memory Segments -------- key shmid owner perms bytes nattch status 0x0056a4d5 0 lightdm 660 488 0 0x0056a4d6 1 lightdm 660 131072 0 0x00000000 6 wwa 600 393216 2 dest 0x00000000 9 wwa 600 524288 2 dest 0x00000000 12 wwa 600 393216 2 dest ------ Semaphore Arrays -------- key semid owner perms nsems 0x0056a4d5 0 lightdm 660 1 == == workaround: == executing speaker-test (on any other program playing audio) as root solves the problem until user's logout back to lightdm. == == ipcs after running speaker-test once as root, alsa audio works again for normal user == ------ Message Queues -------- key msqid owner perms used-bytes messages ------ Shared Memory Segments -------- key shmid owner perms bytes nattch status 0x00000000 6 wwa 600 393216 2 dest 0x00000000 9 wwa 600 524288 2 dest 0x00000000 12 wwa 600 393216 2 dest ------ Semaphore Arrays -------- key semid owner perms nsems -- System Information: Debian Release: trixie/sid APT prefers testing APT policy: (990, 'testing') Architecture: amd64 (x86_64) Kernel: Linux 6.12.13-wwa (SMP w/4 CPU threads; PREEMPT) Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), LANGUAGE not set Shell: /bin/sh linked to /usr/bin/dash Init: systemd (via /run/systemd/system) Versions of packages lightdm depends on: ii adduser 3.137 ii dbus 1.16.2-1 ii debconf [debconf-2.0] 1.5.89 ii libaudit1 1:4.0.2-2+b2 ii libc6 2.40-7 ii libgcrypt20 1.11.0-7 ii libglib2.0-0t64 2.83.4-1 ii libpam-systemd [logind] 257.3-1 ii libpam0g 1.7.0-3 ii libxcb1 1.17.0-2+b1 ii libxdmcp6 1:1.1.5-1 ii lightdm-gtk-greeter [lightdm-greeter] 2.0.9-1 Versions of packages lightdm recommends: ii xserver-xorg 1:7.7+24 Versions of packages lightdm suggests: ii accountsservice 23.13.9-7 ii upower 1.90.7-1 ii xserver-xephyr 2:21.1.15-3 -- debconf information: * shared/default-x-display-manager: lightdm lightdm/daemon_name: /usr/sbin/lightdm
