May 16, 201610 yr Hello Everybody, I am having an annoying issue with my Windows 10 VM, whever I am using my USB DAC and there is significant disk activity the audio crackles enormously. I have already searched for solutions but I have yet to find a solution. This is the way I have set things up: Asus Xonar Essence One Passed through an entire USB controller. SeaBIOS (OVMF does not display) i440fx-2.3 Xeon 1620 v2 (X79) (6 threads given to the VM) AMD Radeon 290X 12Gb of 16Gb RAM given to the VM Unraid 6.1.9 Does anyone know of a solution for this? Attached is my XML settings file. Thanks in advance! Dicratium XML.txt
May 16, 201610 yr I have the same problem but with my GPU. If the screen has a lot of activities, I can hear buzzing noise coming out of the soundcard. I think it's electromagnetic interference so other than repositioning your soundcard / cable etc away from the source, there isn't much more you can do. Another possibility is the inteference is affecting the usb card which in turns affect the signal being sent to the soundcard. That would be very difficult to fix but repositiong the usb card to another slot might help.
May 16, 201610 yr I fixed this by replacing my PSU. I could actually hear the clicking and interference in the PSU if I held my ear close and over the mouse. The exact same sound was coming out through audio.
May 16, 201610 yr Author Thank you for your responses! I'm not sure the cause lies with the PSU since I did not have this problem bare metal. I have already tried to use another port, but the issue persists. Luckily it only occurs with High disk I/O on the VM, so it isn't an issue all the time.
May 16, 201610 yr Not sure about about converters but I had similar issues with a USB headset. Go to playback devices -> right click your device. Go to Advanced and change the Default format to 16 bit, 48000Hz (DVD Quality).
May 16, 201610 yr Author I understand lowering the samplerate might solve the crackling issue. However an important part of the reason I own this specific DAC is its excellent ability to use 192Khz 24-bit sound. Could Seabios be an issue here?
May 31, 201610 yr Author Update: I have since managed to get OVMF working with the newest beta, and although the crackling has reduced somewhat, it is still often very much noticeable, sometimes going as far as making audio basically broken. I honestly don't have a clue of how I can fix this.
May 31, 201610 yr See if this post doesn't offer a solution https://lime-technology.com/forum/index.php?topic=49051.msg470454#msg470454.
May 31, 201610 yr Author Thank you for this solution! It seems to be working so far, I'll update later after some further testing (higher load, etc.) You guide was very easy to follow, I was already reading up on this kind of solution at these pages, however your guide made me understand the concept properly! https://www.ibm.com/developerworks/community/wikis/home?lang=en#!/wiki/W51a7ffcf4dfd_4b40_9d82_446ebc23c550/page/Basic%20XML%20tuning%20tips%20for%20PowerKVM%20guests https://lime-technology.com/forum/index.php?topic=43126.15 https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Virtualization_Tuning_and_Optimization_Guide/sect-Virtualization_Tuning_Optimization_Guide-NUMA-NUMA_and_libvirt-Using_emulatorpin.html Thanks again!
May 31, 201610 yr Glad the solution worked for you. I have seen a lot of confusion on how to manage cpu pinning.
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