# ALSA Bug Report: Roland OCTA-CAPTURE (0582:0120) - White Noise/Static on Playback
## Summary Roland OCTA-CAPTURE USB audio interface produces white noise/static instead of clean audio on Linux, despite being detected and initialized by snd_usb_audio driver.
## Device Information - **Model**: Roland OCTA-CAPTURE (UA-1010) - **USB ID**: 0582:0120 - **Manufacturer**: Roland Corporation - **Device Class**: Vendor Specific (0xFF) - NOT USB Audio Class compliant - **Serial**: ISRL4B236F81
## System Information - **Kernel**: 6.17.9-2-cachyos - **Distribution**: Arch Linux (CachyOS) - **Audio Server**: PipeWire 1.2.7 - **ALSA Driver**: snd_usb_audio (built as module)
## Symptoms 1. Device is correctly detected and recognized by ALSA 2. ALSA shows proper capabilities: S32_LE, 10ch playback, 12ch capture, 44100Hz 3. Audio streams can be sent to device without errors 4. **OUTPUT**: Only white noise/static is produced instead of clean audio 5. Issue occurs with both direct ALSA (speaker-test) and PipeWire 6. Issue persists across all available profiles (multichannel, pro-audio)
## Device Detection (lsusb) ``` Bus 001 Device 008: ID 0582:0120 Roland Corp. OCTA-CAPTURE bDeviceClass 255 Vendor Specific Class bDeviceSubClass 0 bDeviceProtocol 255 idVendor 0x0582 Roland Corp. idProduct 0x0120 OCTA-CAPTURE ```
## ALSA Stream Configuration ``` Roland OCTA-CAPTURE at usb-0000:00:14.0-3, high speed : USB Audio
Playback: Status: Stop Interface 0 Altset 1 Format: S32_LE Channels: 10 Endpoint: 0x05 (5 OUT) (ASYNC) Rates: 44100 Data packet interval: 125 us Bits: 0 Sync Endpoint: 0x85 (5 IN) Sync EP Interface: 1 Sync EP Altset: 1 Implicit Feedback Mode: Yes
Capture: Status: Stop Interface 1 Altset 1 Format: S32_LE Channels: 12 Endpoint: 0x85 (5 IN) (ASYNC) Rates: 44100 Data packet interval: 125 us Bits: 0 Sync Endpoint: 0x05 (5 OUT) Sync EP Interface: 0 Sync EP Altset: 1 Implicit Feedback Mode: Yes ```
## Hardware Configuration - **Digital Input**: OFF (changed from AUTO - no effect) - **Sample Rate**: 44.1kHz (hardware configured) - **Output**: Connected to OUT 1/2 (analog) - **Routing**: Factory reset performed - no effect
## Workarounds Attempted (All Failed) 1. **PipeWire profiles**: Tried pro-audio, multichannel-duplex 2. **Module parameters** (all individually and in combination): - `lowlatency=0` - Disable low-latency mode - `autoclock=0` - Force manual clock - `implicit_fb=0` - Disable implicit feedback - `device_setup=0,1` - Different device modes - `quirk_flags=0x8,0x20` - Various quirk flags 3. **Hardware configuration**: - DIGITAL = OFF (vs AUTO) - Factory reset via hardware buttons 4. **Different audio paths**: - Direct ALSA (hw:1,0) - PipeWire - All produce same static
## Test Command Used ```bash speaker-test -D hw:1,0 -c 10 -t sine -f 440 -r 44100 -F S32_LE -l 3 ``` **Result**: White noise/static instead of clean 440Hz tone
## Kernel Support Status - Device added to implicit feedback skip list in kernel 5.11.9 (March 2021) - Patch: `IMPLICIT_FB_SKIP_DEV(0x0582, 0x0120)` - No additional patches found for kernels 6.x
## Related Devices - Roland Quad-Capture (0582:0118) - Similar architecture, better Linux support - Roland U-8 (older device) - Has third-party Linux tools (u8ctl)
## Known Issues from Community - LinuxMusicians forum: "loud white noise sounds generated along with audio" - Multiple users report same symptom since 2013 - No documented solution exists
## Hypothesis The OCTA-CAPTURE uses Roland's proprietary USB protocol (vendor-specific class 0xFF). The device likely requires: 1. Proprietary initialization sequence not performed by generic snd_usb_audio 2. SysEx MIDI configuration for internal DSP/routing/clock 3. Vendor-specific control messages for proper operation
Without Roland's cooperation or reverse engineering of Windows driver, proper support may be impossible.
## Request 1. Is there additional debugging we can enable to trace USB communication? 2. Could vendor-specific initialization be missing? 3. Would Roland device reverse engineering resources help? 4. Should this device be blacklisted if it cannot work properly?
## Additional Resources - Device manual: https://static.roland.com/assets/media/pdf/OCTA-CAPTURE_v1.6_OM.pdf - Kernel patch (2021): https://patchwork.kernel.org/project/alsa-devel/patch/CAOsVg8psuOkQRoccDs7AZ... - LinuxMusicians thread: https://linuxmusicians.com/viewtopic.php?t=17423
## Contact
Best Regards Niklas Aldervall