!!################################ !!ALSA Information Script v 0.4.64 !!################################ !!Script ran on: Wed Mar 18 09:43:47 UTC 2026 !!Linux Distribution !!------------------ Ubuntu 20.04.6 LTS \n \l DISTRIB_ID=Ubuntu DISTRIB_DESCRIPTION="Ubuntu 20.04.6 LTS" NAME="Ubuntu" ID=ubuntu ID_LIKE=debian PRETTY_NAME="Ubuntu 20.04.6 LTS" HOME_URL="https://www.ubuntu.com/" SUPPORT_URL="https://help.ubuntu.com/" BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/" PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy" UBUNTU_CODENAME=focal Ubuntu 20.04.5 LTS (Focal Fossa) !!DMI Information !!--------------- Manufacturer: Product Name: Product Version: Firmware Version: Board Vendor: Board Name: !!ACPI Device Status Information !!--------------- !!Kernel Information !!------------------ Kernel release: 5.4.0-1129-raspi Operating System: GNU/Linux Architecture: aarch64 Processor: aarch64 SMP Enabled: Yes !!ALSA Version !!------------ Driver version: k5.4.0-1129-raspi Library version: 1.2.2 Utilities version: 1.2.2 !!Loaded ALSA modules !!------------------- snd_bcm2835 !!Sound Servers on this system !!---------------------------- No sound servers found. !!Soundcards recognised by ALSA !!----------------------------- 0 [Headphones ]: bcm2835_headpho - bcm2835 Headphones bcm2835 Headphones !!PCI Soundcards installed in the system !!-------------------------------------- !!Modprobe options (Sound related) !!-------------------------------- snd_pcsp: index=-2 snd_usb_audio: index=-2 snd_atiixp_modem: index=-2 snd_intel8x0m: index=-2 snd_via82xx_modem: index=-2 snd_bcm2835: enable_compat_alsa=0 snd_bcm2835: enable_hdmi=1 !!Loaded sound module options !!--------------------------- !!Module: snd_bcm2835 enable_compat_alsa : N enable_hdmi : Y enable_headphones : Y force_bulk : N !!ALSA Device nodes !!----------------- crw-rw---- 1 root audio 116, 3 Jun 17 2024 /dev/snd/controlC0 crw-rw---- 1 root audio 116, 2 Jun 17 2024 /dev/snd/pcmC0D0p crw-rw---- 1 root audio 116, 1 Jun 17 2024 /dev/snd/seq crw-rw---- 1 root audio 116, 33 Jun 17 2024 /dev/snd/timer /dev/snd/by-path: total 0 drwxr-xr-x 2 root root 60 Jun 17 2024 . drwxr-xr-x 3 root root 140 Jun 17 2024 .. lrwxrwxrwx 1 root root 12 Jun 17 2024 platform-bcm2835_audio -> ../controlC0 !!ALSA configuration files !!------------------------ !!User specific config file (~/.asoundrc) pcm.!default { type asym playback.pcm { type plug slave.pcm "output" } capture.pcm { type plug slave.pcm "input" } } pcm.output { type hw card 1 } ctl.!default { type hw card 1 } !!Aplay/Arecord output !!-------------------- APLAY **** List of PLAYBACK Hardware Devices **** card 0: Headphones [bcm2835 Headphones], device 0: bcm2835 Headphones [bcm2835 Headphones] Subdevices: 8/8 Subdevice #0: subdevice #0 Subdevice #1: subdevice #1 Subdevice #2: subdevice #2 Subdevice #3: subdevice #3 Subdevice #4: subdevice #4 Subdevice #5: subdevice #5 Subdevice #6: subdevice #6 Subdevice #7: subdevice #7 ARECORD **** List of CAPTURE Hardware Devices **** !!Amixer output !!------------- !!-------Mixer controls for card Headphones Card hw:0 'Headphones'/'bcm2835 Headphones' Mixer name : 'Broadcom Mixer' Components : '' Controls : 2 Simple ctrls : 1 Simple mixer control 'Headphone',0 Capabilities: pvolume pvolume-joined pswitch pswitch-joined Playback channels: Mono Limits: Playback -10239 - 400 Mono: Playback -3721 [61%] [-37.21dB] [on] !!Alsactl output !!-------------- --startcollapse-- state.Headphones { control.1 { iface MIXER name 'Headphone Playback Volume' value -3721 comment { access 'read write' type INTEGER count 1 range '-10239 - 400' dbmin -9999999 dbmax 400 dbvalue.0 -3721 } } control.2 { iface MIXER name 'Headphone Playback Switch' value true comment { access 'read write' type BOOLEAN count 1 } } } --endcollapse-- !!All Loaded Modules !!------------------ aes_neon_blk aes_neon_bs async_memcpy async_pq async_raid6_recov async_tx async_xor autofs4 bcm2835_codec bcm2835_isp bcm2835_mmal_vchiq bcm2835_v4l2 binfmt_misc bluetooth brcmfmac brcmutil btrfs btsdio cfg80211 crct10dif_ce cryptd crypto_simd dm_multipath drm dwc2 ecc ecdh_generic ip_tables libcrc32c linear lp mc multipath parport phy_generic ppdev raid0 raid1 raid10 raid456 raid6_pq ramoops raspberrypi_hwmon reed_solomon sch_fq_codel scsi_dh_alua scsi_dh_emc scsi_dh_rdac snd snd_bcm2835 snd_pcm snd_timer spidev uas udc_core uio uio_pdrv_genirq usb_storage usblp v4l2_mem2mem vc_sm_cma videobuf2_common videobuf2_dma_contig videobuf2_memops videobuf2_v4l2 videobuf2_vmalloc videodev x_tables xor xor_neon zstd_compress !!ALSA/HDA dmesg !!-------------- [ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 238896 [ 0.000000] Kernel command line: coherent_pool=1M 8250.nr_uarts=1 snd_bcm2835.enable_compat_alsa=0 snd_bcm2835.enable_hdmi=1 bcm2708_fb.fbwidth=720 bcm2708_fb.fbheight=480 bcm2708_fb.fbswap=1 vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000 elevator=deadline net.ifnames=0 console=ttyS0,115200 dwc_otg.lpm_enable=0 console=tty1 root=LABEL=writable rootfstype=ext4 rootwait fixrtc quiet splash quiet splash [ 0.000000] Dentry cache hash table entries: 131072 (order: 8, 1048576 bytes, linear) -- [ 16.513447] videodev: Linux video capture interface: v2.00 [ 16.570481] snd_bcm2835: module is from the staging directory, the quality is unknown, you have been warned. [ 16.578470] bcm2835_audio bcm2835_audio: card created with 8 channels