I actually have already done that. The HDA will re-install (with ! warning).
The sound card allows you to uninstall
and optionally delete files. I took that route. On reboot, it cannot find a driver and shows as a multimedia device with the "!" warning. I then have to install the driver manually. The driver is thorough enuf to detect even a trace of itself and
also does an uninstall. Boot. Install. Boot. Still no luck.
I have had to rethink.
(1) My initial assumption that the HDA driver was at fault was incorrect. Yesterday, when I came home, I had audio even when the HDA was showing the "!" warning. I have to think the HDA driver is not necessary for sound.
(2) While I would think it would be hardware, I have tried 3 hardware schemes (read back a few days), with the same results. Windows did not whine when I installed each driver so I can guess they are certified for W8.
(3) I would then think then the MoBo, but I did the Intel chip set analyzer and have the up-to-date drivers. I would also suspect that more than sound would be gone if the chip set was upset.
(4) In BIOS, I disabled the on-board audio, just to be sure. I did not have to do that before, tho' (and I did re-enable it when I tried the on-board RealTek driver).
I have considered a USB type audio solution, but am not ready to do that, as of yet. I dunno any one I could borrow one from either, just as a diagnostic tool. :-\
Thanks for your continuing support.