Here is version Alpha-013 which rearranges a lot of the codec init code and tries to init all the Line Outs no matter what.

https://github.com/andrew-hoffman/WDMHDA/rele … s/tag/Alpha-013

My SFF with an ALC887 codec now produces some sound but it is garbled; small segments will keep looping until I do something that causes hard drive activity and then it will play a bit more into the buffer. It's possible that the interrupt is not firing or is being suppressed. The problematic system has most devices sharing IRQ 11.

Released Alpha-014 which ignores outputs marked as not connected by the BIOS pin configuration. This improves compatibility quite a bit. It now functions on Intel 915G /Realtek ALC880. Still investigating the garbled sound issue with newer post-2010 chipsets.

https://github.com/andrew-hoffman/WDMHDA/rele … s/tag/Alpha-014

e: I think I broke something on Atom systems between version 12 and 13, where it hangs on a blinking cursor after the Windows splash screen, and it's annoying because it doesn't happen if i have the driver disabled, change the version and then enable it after boot. So I can't see the crash in DbgView. Does anyone happen to have an industrial embedded Atom PC with a serial port?

There was a revision of HDA around that time.

Found it.
1.0a
https://www.intel.com/content/dam/www/public/ … ecification.pdf

1.0 Initial Release April 15, 2004
1.0a June 17, 2010

• Updated with DCN No: HDA001-A changes.
• Updated with DCN No: HDA002-A changes.
• Updated with DCN No: HDA006-A changes.
• Updated with DCN No: HDA011-A changes.
• Updated with DCN No: HDA012-A changes.
• Updated with DCN No: HDA015-B changes.
• Updated with DCN No: HDA016-A changes.
• Updated with DCN No: HDA017-A changes.
• Updated with DCN No: HDA019-A changes.
• Updated with DCN No: HDA022-A changes.
• Updated with DCN No: HDA024-A changes.
• Updated with DCN No: HDA034-A2 changes.
• Updated with DCN No: HDA035-A changes.
• Updated with DCN No: HDA036-A changes.
• Updated with DCN No: HDA039-A changes.
• Updated with DCN No: HDA041-A changes.
• Updated with DCN No: HDA042-A changes.

Errata:

• Clarified Input Payload Capability and Output Payload Capability Reset value is implementation specific.
• Clarified that Stream Descriptor n FIFO Size must be valid and static after every programming of data format register, as well as when RUN bit is set.
• Clarified that Stream Descriptor n BDL Pointer Upper Base Address register attribute is RO if not supporting 64 bit addressing.
• Fixed timing error in “Codec Discovery” section that SW should wait for at least 521 us (25 frames) after reading CRST# as „1‟ before accessing codec.
• Strongly recommend the default value for EAPD to be „1‟ in “EAPD/BTL Enable” section.
• Clarified the codec response expected for double Function Group reset command in D3cold state, but recommended no response for the first Function Group reset of the double Function Group reset command sequence.
• Clarified the reset value for FIFOS register is implementation specific.
• Clarified UR enable verb for function group node is conditional in the required support for verbs table.

Seeing as this is a WDM driver, can it work in 2K/XP? Or are there big differences between 98 and 2K audio drivers?