Public bug reported: # Bug Report: Internal Microphone Non-Functional on Dell Precision 5690 (rt712-sdca-dmic / SoundWire)
## Summary The internal microphone on a Dell Precision 5690 is completely non- functional under Ubuntu 22.04 LTS with HWE kernels 6.8.0-100 and 6.8.0-101. The SoundWire codecs enumerate and attach successfully, the SOF DSP firmware loads without errors, and all ALSA mixer controls are correctly set — but no audio is captured from any capture PCM device. The bug appears to be present across multiple kernel versions and is not triggered by any identifiable software change. This bug report, along with many debugging steps, was produced with help from Claude. It seems that it is related to bug https://github.com/thesofproject/sof/issues/9852 --- ## System Information | Field | Value | |---|---| | Machine | Dell Precision 5690 | | BIOS Version | 1.15.1 (current) | | OS | Ubuntu 22.04.x LTS | | Kernels tested | 6.8.0-100-generic, 6.8.0-101-generic | | Audio driver | sof-audio-pci-intel-mtl | | DSP | Intel Meteor Lake audio DSP | | Headset codec | rt712-sdca (sdw:0:0:025d:0713:01) | | DMIC codec | rt712-sdca-dmic (sdw:0:3:025d:1713:01) | | Amplifier codecs | rt1316-sdw x2 (sdw:0:1:025d:1316:01, sdw:0:2:025d:1316:01) | | SOF firmware version | 2.8.1.1 | | Topology file | intel/sof-ace-tplg/sof-mtl-rt713-l0-rt1316-l12-rt1713-l3.tplg | | firmware-sof-signed | 2.0-1ubuntu4.7 | | alsa-ucm-conf | 1.2.6.3-1ubuntu1.12 | --- ## Symptom The internal microphone produces complete silence. The capture PCM device opens successfully and accepts recording commands, but the resulting audio file contains only silence. This affects all capture devices on card 1 (sofsoundwire). Speakers, headphone output, and headset audio output all work correctly. The microphone appears in Zoom's audio settings as "sof-soundwire SoundWire microphone" but produces no signal. --- ## Detailed Diagnostic Findings ### 1. SOF firmware initialises cleanly The SOF DSP firmware loads without any errors: ``` sof-audio-pci-intel-mtl 0000:00:1f.3: DSP detected with PCI class/subclass/prog-if 0x040100 sof-audio-pci-intel-mtl 0000:00:1f.3: Loaded firmware library: ADSPFW, version: 2.8.1.1 sof-audio-pci-intel-mtl 0000:00:1f.3: Topology file: intel/sof-ace-tplg/sof-mtl-rt713-l0-rt1316-l12-rt1713-l3.tplg ``` No SOF errors appear in `journalctl -b -k`. ### 2. SoundWire codecs attach successfully All four SoundWire codec devices enumerate and report `Attached` status: ``` /sys/bus/soundwire/devices/sdw:0:0:025d:0713:01 → Attached /sys/bus/soundwire/devices/sdw:0:1:025d:1316:01 → Attached /sys/bus/soundwire/devices/sdw:0:2:025d:1316:01 → Attached /sys/bus/soundwire/devices/sdw:0:3:025d:1713:01 → Attached ``` ### 3. Bus clash on some boots On some boots the following error appears for the DMIC codec: ``` rt712-sdca-dmic sdw:0:3:025d:1713:01: Bus clash detected before INT mask is enabled ``` On other boots this error is absent, but the mic remains non-functional regardless of whether the error appears. The behaviour varies between boots without any obvious trigger. ### 4. PCM device names are empty `/proc/asound/card1/pcm*/info` shows all PCM devices with blank `name:` fields, which is abnormal and suggests the card is not fully initialised: ``` card: 1 device: 4 stream: CAPTURE name: ← should show "DMIC" or similar ``` ### 5. Components file absent `/proc/asound/card1/components` does not exist. This file is normally created by the ASoC driver when SoundWire codecs are successfully registered, and its absence causes UCM to fail to match the card to its configuration profile: ``` alsaucm: error failed to open sound card sofsoundwire: No such file or directory ALSA lib main.c:1412: error: failed to import sofsoundwire use case configuration -2 ``` ### 6. UCM loads via hw:1 but mic remains silent UCM can be loaded using `hw:1` instead of the card name: ``` alsaucm -c hw:1 list _verbs → 0: HiFi alsaucm -c hw:1 set _verb HiFi set _enadev Mic → succeeds ``` But recording from `hw:sofsoundwire,4` still produces silence even after manually running the UCM boot sequence: ```bash amixer -c 1 cset "name='rt713-dmic ADC 25 Mux'" "DMIC1" amixer -c 1 cset "name='rt713-dmic FU1E Capture Switch'" 1 ``` ### 7. ALSA mixer controls are correctly set All capture controls are enabled and at non-zero levels: - `rt713-dmic FU1E Capture Switch`: on, on, on, on - `rt713-dmic FU1E Capture Volume`: 63, 63, 63, 63 - `rt713 FU0F Capture Switch`: on, on - `rt713 FU0F Capture Volume`: 57, 57 ### 8. ASoC deferred binding Every boot produces: ``` sof_sdw sof_sdw: ASoC: Parent card not yet available, widget card binding deferred ``` It is unclear whether this deferred binding ever completes successfully. --- ## Things Ruled Out The following have been tested and confirmed **not** to be the cause: - **Kernel version**: Bug present on both 6.8.0-100 and 6.8.0-101 - **intel-microcode update**: Downgraded from 3.20260210 to 3.20250812 — no effect - **PipeWire / pipewire-pulse**: Bug is at ALSA level; `arecord` also produces silence - **ALSA mixer mute**: All capture switches are on, all volumes are non-zero - **UCM configuration files**: All timestamps are old; files are unmodified - **firmware-sof-signed**: Package is current; reinstall had no effect - **Full power cycle**: Did not fix the issue - **BIOS microphone toggle**: Disabled and re-enabled microphone in BIOS — no effect - **Fn key / mic mute key**: F4 and Fn+F4 and Fn Lock toggled — no effect - **alsa force-reload**: Makes capture devices visible to `arecord -l` but capture still silent --- ## Relationship to Known Issues This appears to be related to or the same as: - SOF project issue #9852: https://github.com/thesofproject/sof/issues/9852 - Ubuntu Launchpad bug #2098820: https://bugs.launchpad.net/bugs/2098820 The original SOF issue reports a crackling/fluctuating signal rather than complete silence, which may indicate a different failure mode or a progression of the same underlying problem. --- ## Additional Notes - Speakers and headphone output work correctly on the same SOF card - The bug appears to have been present for at least several weeks (last confirmed working: late February 2025) - No software update has been identified that correlates with the onset of the bug - Dell Precision 5690 is sold with Ubuntu Linux support --- ## Contact Hostname: user-Precision-5690 ProblemType: Bug DistroRelease: Ubuntu 22.04 Package: linux-image-6.8.0-100-generic 6.8.0-100.100~22.04.1 ProcVersionSignature: Ubuntu 6.8.0-100.100~22.04.1-generic 6.8.12 Uname: Linux 6.8.0-100-generic x86_64 ApportVersion: 2.20.11-0ubuntu82.10 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: user 2324 F.... pulseaudio /dev/snd/controlC0: user 2324 F.... pulseaudio CRDA: N/A CasperMD5CheckMismatches: ./boot/grub/efi.img ./casper/initrd ./casper/vmlinuz ./scripts/chroot-scripts/os-post/70_fix-apt-installed.sh CasperMD5CheckResult: fail CurrentDesktop: ubuntu:GNOME Date: Fri Mar 6 13:58:16 2026 DistributionChannelDescriptor: # This is the distribution channel descriptor for the OEM CDs # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor canonical-oem-somerville-jammy-amd64-20220504-33 InstallationDate: Installed on 2024-11-16 (475 days ago) InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - somerville-jammy-amd64-20220504-33 IwConfig: lo no wireless extensions. wlp2s0f0 no wireless extensions. MachineType: Dell Inc. Precision 5690 ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.8.0-100-generic root=UUID=9d99b2f4-413f-47b2-8297-f854c64d6129 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-6.8.0-100-generic N/A linux-backports-modules-6.8.0-100-generic N/A linux-firmware 20220329.git681281e4-0ubuntu3.41 SourcePackage: linux-hwe-6.8 UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 07/24/2025 dmi.bios.release: 1.15 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.15.1 dmi.board.name: 0V3V80 dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 10 dmi.chassis.vendor: Dell Inc. dmi.ec.firmware.release: 1.22 dmi.modalias: dmi:bvnDellInc.:bvr1.15.1:bd07/24/2025:br1.15:efr1.22:svnDellInc.:pnPrecision5690:pvr:rvnDellInc.:rn0V3V80:rvrA00:cvnDellInc.:ct10:cvr:sku0CC8: dmi.product.family: Precision dmi.product.name: Precision 5690 dmi.product.sku: 0CC8 dmi.sys.vendor: Dell Inc. ** Affects: linux-hwe-6.8 (Ubuntu) Importance: Undecided Status: New ** Tags: sof-soundwire ** Description changed: - - # Bug Report: Internal Microphone Non-Functional on Dell Precision 5690 (rt712-sdca-dmic / SoundWire) + # Bug Report: Internal Microphone Non-Functional on Dell Precision 5690 + (rt712-sdca-dmic / SoundWire) ## Summary The internal microphone on a Dell Precision 5690 is completely non- functional under Ubuntu 22.04 LTS with HWE kernels 6.8.0-100 and 6.8.0-101. The SoundWire codecs enumerate and attach successfully, the SOF DSP firmware loads without errors, and all ALSA mixer controls are correctly set — but no audio is captured from any capture PCM device. The bug appears to be present across multiple kernel versions and is not triggered by any identifiable software change. This bug report, along with many debugging steps, has produced with help from Claude. It seems that it is related to bug https://github.com/thesofproject/sof/issues/9852 --- ## System Information | Field | Value | |---|---| | Machine | Dell Precision 5690 | | BIOS Version | 1.15.1 (current) | | OS | Ubuntu 22.04.x LTS | | Kernels tested | 6.8.0-100-generic, 6.8.0-101-generic | | Audio driver | sof-audio-pci-intel-mtl | | DSP | Intel Meteor Lake audio DSP | | Headset codec | rt712-sdca (sdw:0:0:025d:0713:01) | | DMIC codec | rt712-sdca-dmic (sdw:0:3:025d:1713:01) | | Amplifier codecs | rt1316-sdw x2 (sdw:0:1:025d:1316:01, sdw:0:2:025d:1316:01) | | SOF firmware version | 2.8.1.1 | | Topology file | intel/sof-ace-tplg/sof-mtl-rt713-l0-rt1316-l12-rt1713-l3.tplg | | firmware-sof-signed | 2.0-1ubuntu4.7 | | alsa-ucm-conf | 1.2.6.3-1ubuntu1.12 | --- ## Symptom The internal microphone produces complete silence. The capture PCM device opens successfully and accepts recording commands, but the resulting audio file contains only silence. This affects all capture devices on card 1 (sofsoundwire). Speakers, headphone output, and headset audio output all work correctly. The microphone appears in Zoom's audio settings as "sof-soundwire SoundWire microphone" but produces no signal. --- ## Detailed Diagnostic Findings ### 1. SOF firmware initialises cleanly The SOF DSP firmware loads without any errors: ``` sof-audio-pci-intel-mtl 0000:00:1f.3: DSP detected with PCI class/subclass/prog-if 0x040100 sof-audio-pci-intel-mtl 0000:00:1f.3: Loaded firmware library: ADSPFW, version: 2.8.1.1 sof-audio-pci-intel-mtl 0000:00:1f.3: Topology file: intel/sof-ace-tplg/sof-mtl-rt713-l0-rt1316-l12-rt1713-l3.tplg ``` No SOF errors appear in `journalctl -b -k`. ### 2. SoundWire codecs attach successfully All four SoundWire codec devices enumerate and report `Attached` status: ``` /sys/bus/soundwire/devices/sdw:0:0:025d:0713:01 → Attached /sys/bus/soundwire/devices/sdw:0:1:025d:1316:01 → Attached /sys/bus/soundwire/devices/sdw:0:2:025d:1316:01 → Attached /sys/bus/soundwire/devices/sdw:0:3:025d:1713:01 → Attached ``` ### 3. Bus clash on some boots On some boots the following error appears for the DMIC codec: ``` rt712-sdca-dmic sdw:0:3:025d:1713:01: Bus clash detected before INT mask is enabled ``` On other boots this error is absent, but the mic remains non-functional regardless of whether the error appears. The behaviour varies between boots without any obvious trigger. ### 4. PCM device names are empty `/proc/asound/card1/pcm*/info` shows all PCM devices with blank `name:` fields, which is abnormal and suggests the card is not fully initialised: ``` card: 1 device: 4 stream: CAPTURE name: ← should show "DMIC" or similar ``` ### 5. Components file absent `/proc/asound/card1/components` does not exist. This file is normally created by the ASoC driver when SoundWire codecs are successfully registered, and its absence causes UCM to fail to match the card to its configuration profile: ``` alsaucm: error failed to open sound card sofsoundwire: No such file or directory ALSA lib main.c:1412: error: failed to import sofsoundwire use case configuration -2 ``` ### 6. UCM loads via hw:1 but mic remains silent UCM can be loaded using `hw:1` instead of the card name: ``` alsaucm -c hw:1 list _verbs → 0: HiFi alsaucm -c hw:1 set _verb HiFi set _enadev Mic → succeeds ``` But recording from `hw:sofsoundwire,4` still produces silence even after manually running the UCM boot sequence: ```bash amixer -c 1 cset "name='rt713-dmic ADC 25 Mux'" "DMIC1" amixer -c 1 cset "name='rt713-dmic FU1E Capture Switch'" 1 ``` ### 7. ALSA mixer controls are correctly set All capture controls are enabled and at non-zero levels: - `rt713-dmic FU1E Capture Switch`: on, on, on, on - `rt713-dmic FU1E Capture Volume`: 63, 63, 63, 63 - `rt713 FU0F Capture Switch`: on, on - `rt713 FU0F Capture Volume`: 57, 57 ### 8. ASoC deferred binding Every boot produces: ``` sof_sdw sof_sdw: ASoC: Parent card not yet available, widget card binding deferred ``` It is unclear whether this deferred binding ever completes successfully. --- ## Things Ruled Out The following have been tested and confirmed **not** to be the cause: - **Kernel version**: Bug present on both 6.8.0-100 and 6.8.0-101 - **intel-microcode update**: Downgraded from 3.20260210 to 3.20250812 — no effect - **PipeWire / pipewire-pulse**: Bug is at ALSA level; `arecord` also produces silence - **ALSA mixer mute**: All capture switches are on, all volumes are non-zero - **UCM configuration files**: All timestamps are old; files are unmodified - **firmware-sof-signed**: Package is current; reinstall had no effect - **Full power cycle**: Did not fix the issue - **BIOS microphone toggle**: Disabled and re-enabled microphone in BIOS — no effect - **Fn key / mic mute key**: F4 and Fn+F4 and Fn Lock toggled — no effect - **alsa force-reload**: Makes capture devices visible to `arecord -l` but capture still silent --- ## Relationship to Known Issues This appears to be related to or the same as: - SOF project issue #9852: https://github.com/thesofproject/sof/issues/9852 - Ubuntu Launchpad bug #2098820: https://bugs.launchpad.net/bugs/2098820 The original SOF issue reports a crackling/fluctuating signal rather than complete silence, which may indicate a different failure mode or a progression of the same underlying problem. --- ## Additional Notes - Speakers and headphone output work correctly on the same SOF card - The bug appears to have been present for at least several weeks (last confirmed working: late February 2025) - No software update has been identified that correlates with the onset of the bug - Dell Precision 5690 is sold with Ubuntu Linux support --- ## Contact - Hostname: cjmonahan-Precision-5690 + Hostname: user-Precision-5690 ProblemType: Bug DistroRelease: Ubuntu 22.04 Package: linux-image-6.8.0-100-generic 6.8.0-100.100~22.04.1 ProcVersionSignature: Ubuntu 6.8.0-100.100~22.04.1-generic 6.8.12 Uname: Linux 6.8.0-100-generic x86_64 ApportVersion: 2.20.11-0ubuntu82.10 Architecture: amd64 AudioDevicesInUse: - USER PID ACCESS COMMAND - /dev/snd/controlC1: cjmonahan 2324 F.... pulseaudio - /dev/snd/controlC0: cjmonahan 2324 F.... pulseaudio + USER PID ACCESS COMMAND + /dev/snd/controlC1: user 2324 F.... pulseaudio + /dev/snd/controlC0: user 2324 F.... pulseaudio CRDA: N/A CasperMD5CheckMismatches: ./boot/grub/efi.img ./casper/initrd ./casper/vmlinuz ./scripts/chroot-scripts/os-post/70_fix-apt-installed.sh CasperMD5CheckResult: fail CurrentDesktop: ubuntu:GNOME Date: Fri Mar 6 13:58:16 2026 DistributionChannelDescriptor: - # This is the distribution channel descriptor for the OEM CDs - # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor - canonical-oem-somerville-jammy-amd64-20220504-33 + # This is the distribution channel descriptor for the OEM CDs + # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor + canonical-oem-somerville-jammy-amd64-20220504-33 InstallationDate: Installed on 2024-11-16 (475 days ago) InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - somerville-jammy-amd64-20220504-33 IwConfig: - lo no wireless extensions. - - wlp2s0f0 no wireless extensions. + lo no wireless extensions. + + wlp2s0f0 no wireless extensions. MachineType: Dell Inc. Precision 5690 ProcEnviron: - TERM=xterm-256color - PATH=(custom, no user) - XDG_RUNTIME_DIR=<set> - LANG=en_US.UTF-8 - SHELL=/bin/bash + TERM=xterm-256color + PATH=(custom, no user) + XDG_RUNTIME_DIR=<set> + LANG=en_US.UTF-8 + SHELL=/bin/bash ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.8.0-100-generic root=UUID=9d99b2f4-413f-47b2-8297-f854c64d6129 ro quiet splash vt.handoff=7 RelatedPackageVersions: - linux-restricted-modules-6.8.0-100-generic N/A - linux-backports-modules-6.8.0-100-generic N/A - linux-firmware 20220329.git681281e4-0ubuntu3.41 + linux-restricted-modules-6.8.0-100-generic N/A + linux-backports-modules-6.8.0-100-generic N/A + linux-firmware 20220329.git681281e4-0ubuntu3.41 SourcePackage: linux-hwe-6.8 UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 07/24/2025 dmi.bios.release: 1.15 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.15.1 dmi.board.name: 0V3V80 dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 10 dmi.chassis.vendor: Dell Inc. dmi.ec.firmware.release: 1.22 dmi.modalias: dmi:bvnDellInc.:bvr1.15.1:bd07/24/2025:br1.15:efr1.22:svnDellInc.:pnPrecision5690:pvr:rvnDellInc.:rn0V3V80:rvrA00:cvnDellInc.:ct10:cvr:sku0CC8: dmi.product.family: Precision dmi.product.name: Precision 5690 dmi.product.sku: 0CC8 dmi.sys.vendor: Dell Inc. ** Description changed: # Bug Report: Internal Microphone Non-Functional on Dell Precision 5690 (rt712-sdca-dmic / SoundWire) ## Summary The internal microphone on a Dell Precision 5690 is completely non- functional under Ubuntu 22.04 LTS with HWE kernels 6.8.0-100 and 6.8.0-101. The SoundWire codecs enumerate and attach successfully, the SOF DSP firmware loads without errors, and all ALSA mixer controls are correctly set — but no audio is captured from any capture PCM device. The bug appears to be present across multiple kernel versions and is not triggered by any identifiable software change. - This bug report, along with many debugging steps, has produced with help + This bug report, along with many debugging steps, was produced with help from Claude. It seems that it is related to bug https://github.com/thesofproject/sof/issues/9852 --- ## System Information | Field | Value | |---|---| | Machine | Dell Precision 5690 | | BIOS Version | 1.15.1 (current) | | OS | Ubuntu 22.04.x LTS | | Kernels tested | 6.8.0-100-generic, 6.8.0-101-generic | | Audio driver | sof-audio-pci-intel-mtl | | DSP | Intel Meteor Lake audio DSP | | Headset codec | rt712-sdca (sdw:0:0:025d:0713:01) | | DMIC codec | rt712-sdca-dmic (sdw:0:3:025d:1713:01) | | Amplifier codecs | rt1316-sdw x2 (sdw:0:1:025d:1316:01, sdw:0:2:025d:1316:01) | | SOF firmware version | 2.8.1.1 | | Topology file | intel/sof-ace-tplg/sof-mtl-rt713-l0-rt1316-l12-rt1713-l3.tplg | | firmware-sof-signed | 2.0-1ubuntu4.7 | | alsa-ucm-conf | 1.2.6.3-1ubuntu1.12 | --- ## Symptom The internal microphone produces complete silence. The capture PCM device opens successfully and accepts recording commands, but the resulting audio file contains only silence. This affects all capture devices on card 1 (sofsoundwire). Speakers, headphone output, and headset audio output all work correctly. The microphone appears in Zoom's audio settings as "sof-soundwire SoundWire microphone" but produces no signal. --- ## Detailed Diagnostic Findings ### 1. SOF firmware initialises cleanly The SOF DSP firmware loads without any errors: ``` sof-audio-pci-intel-mtl 0000:00:1f.3: DSP detected with PCI class/subclass/prog-if 0x040100 sof-audio-pci-intel-mtl 0000:00:1f.3: Loaded firmware library: ADSPFW, version: 2.8.1.1 sof-audio-pci-intel-mtl 0000:00:1f.3: Topology file: intel/sof-ace-tplg/sof-mtl-rt713-l0-rt1316-l12-rt1713-l3.tplg ``` No SOF errors appear in `journalctl -b -k`. ### 2. SoundWire codecs attach successfully All four SoundWire codec devices enumerate and report `Attached` status: ``` /sys/bus/soundwire/devices/sdw:0:0:025d:0713:01 → Attached /sys/bus/soundwire/devices/sdw:0:1:025d:1316:01 → Attached /sys/bus/soundwire/devices/sdw:0:2:025d:1316:01 → Attached /sys/bus/soundwire/devices/sdw:0:3:025d:1713:01 → Attached ``` ### 3. Bus clash on some boots On some boots the following error appears for the DMIC codec: ``` rt712-sdca-dmic sdw:0:3:025d:1713:01: Bus clash detected before INT mask is enabled ``` On other boots this error is absent, but the mic remains non-functional regardless of whether the error appears. The behaviour varies between boots without any obvious trigger. ### 4. PCM device names are empty `/proc/asound/card1/pcm*/info` shows all PCM devices with blank `name:` fields, which is abnormal and suggests the card is not fully initialised: ``` card: 1 device: 4 stream: CAPTURE name: ← should show "DMIC" or similar ``` ### 5. Components file absent `/proc/asound/card1/components` does not exist. This file is normally created by the ASoC driver when SoundWire codecs are successfully registered, and its absence causes UCM to fail to match the card to its configuration profile: ``` alsaucm: error failed to open sound card sofsoundwire: No such file or directory ALSA lib main.c:1412: error: failed to import sofsoundwire use case configuration -2 ``` ### 6. UCM loads via hw:1 but mic remains silent UCM can be loaded using `hw:1` instead of the card name: ``` alsaucm -c hw:1 list _verbs → 0: HiFi alsaucm -c hw:1 set _verb HiFi set _enadev Mic → succeeds ``` But recording from `hw:sofsoundwire,4` still produces silence even after manually running the UCM boot sequence: ```bash amixer -c 1 cset "name='rt713-dmic ADC 25 Mux'" "DMIC1" amixer -c 1 cset "name='rt713-dmic FU1E Capture Switch'" 1 ``` ### 7. ALSA mixer controls are correctly set All capture controls are enabled and at non-zero levels: - `rt713-dmic FU1E Capture Switch`: on, on, on, on - `rt713-dmic FU1E Capture Volume`: 63, 63, 63, 63 - `rt713 FU0F Capture Switch`: on, on - `rt713 FU0F Capture Volume`: 57, 57 ### 8. ASoC deferred binding Every boot produces: ``` sof_sdw sof_sdw: ASoC: Parent card not yet available, widget card binding deferred ``` It is unclear whether this deferred binding ever completes successfully. --- ## Things Ruled Out The following have been tested and confirmed **not** to be the cause: - **Kernel version**: Bug present on both 6.8.0-100 and 6.8.0-101 - **intel-microcode update**: Downgraded from 3.20260210 to 3.20250812 — no effect - **PipeWire / pipewire-pulse**: Bug is at ALSA level; `arecord` also produces silence - **ALSA mixer mute**: All capture switches are on, all volumes are non-zero - **UCM configuration files**: All timestamps are old; files are unmodified - **firmware-sof-signed**: Package is current; reinstall had no effect - **Full power cycle**: Did not fix the issue - **BIOS microphone toggle**: Disabled and re-enabled microphone in BIOS — no effect - **Fn key / mic mute key**: F4 and Fn+F4 and Fn Lock toggled — no effect - **alsa force-reload**: Makes capture devices visible to `arecord -l` but capture still silent --- ## Relationship to Known Issues This appears to be related to or the same as: - SOF project issue #9852: https://github.com/thesofproject/sof/issues/9852 - Ubuntu Launchpad bug #2098820: https://bugs.launchpad.net/bugs/2098820 The original SOF issue reports a crackling/fluctuating signal rather than complete silence, which may indicate a different failure mode or a progression of the same underlying problem. --- ## Additional Notes - Speakers and headphone output work correctly on the same SOF card - The bug appears to have been present for at least several weeks (last confirmed working: late February 2025) - No software update has been identified that correlates with the onset of the bug - Dell Precision 5690 is sold with Ubuntu Linux support --- ## Contact Hostname: user-Precision-5690 ProblemType: Bug DistroRelease: Ubuntu 22.04 Package: linux-image-6.8.0-100-generic 6.8.0-100.100~22.04.1 ProcVersionSignature: Ubuntu 6.8.0-100.100~22.04.1-generic 6.8.12 Uname: Linux 6.8.0-100-generic x86_64 ApportVersion: 2.20.11-0ubuntu82.10 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: user 2324 F.... pulseaudio /dev/snd/controlC0: user 2324 F.... pulseaudio CRDA: N/A CasperMD5CheckMismatches: ./boot/grub/efi.img ./casper/initrd ./casper/vmlinuz ./scripts/chroot-scripts/os-post/70_fix-apt-installed.sh CasperMD5CheckResult: fail CurrentDesktop: ubuntu:GNOME Date: Fri Mar 6 13:58:16 2026 DistributionChannelDescriptor: # This is the distribution channel descriptor for the OEM CDs # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor canonical-oem-somerville-jammy-amd64-20220504-33 InstallationDate: Installed on 2024-11-16 (475 days ago) InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - somerville-jammy-amd64-20220504-33 IwConfig: lo no wireless extensions. wlp2s0f0 no wireless extensions. MachineType: Dell Inc. Precision 5690 ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.8.0-100-generic root=UUID=9d99b2f4-413f-47b2-8297-f854c64d6129 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-6.8.0-100-generic N/A linux-backports-modules-6.8.0-100-generic N/A linux-firmware 20220329.git681281e4-0ubuntu3.41 SourcePackage: linux-hwe-6.8 UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 07/24/2025 dmi.bios.release: 1.15 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.15.1 dmi.board.name: 0V3V80 dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 10 dmi.chassis.vendor: Dell Inc. dmi.ec.firmware.release: 1.22 dmi.modalias: dmi:bvnDellInc.:bvr1.15.1:bd07/24/2025:br1.15:efr1.22:svnDellInc.:pnPrecision5690:pvr:rvnDellInc.:rn0V3V80:rvrA00:cvnDellInc.:ct10:cvr:sku0CC8: dmi.product.family: Precision dmi.product.name: Precision 5690 dmi.product.sku: 0CC8 dmi.sys.vendor: Dell Inc. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2143593 Title: Internal microphone has stopped working - Dell Precision 5690 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-hwe-6.8/+bug/2143593/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
