[Bug 1873769] Re: SB16 audio playback freezes emulation in Windows 95 guest

[Allan Peramaki]

This is with GTK UI? Do you still have the same problem if you use Spice
and remote-viewer instead?

(GTK UI and Sound Blaster 16 emulation don't play well together. GTK UI
does screen updates only when the main event loop becomes idle, but it
never becomes idle when SB16 audio is playing due to the way
hw/dma/i8257 works. The combination of GTK UI screen updates + SB16 DMA
transfer additionally causes i8257_dma_run() getting called at a very
rapid rate.)

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https://bugs.launchpad.net/bugs/1873769

Title:
  SB16 audio playback freezes emulation in Windows 95 guest

Status in QEMU:
  New

Bug description:
  - QEMU 4.2.93 (v5.0.0-rc3) built from latest git master
  20038cd7a8412feeb49c01f6ede89e36c8995472 using MSYS2 on Windows 10 and
  launched on same Windows 10

  - Launched using "qemu-system-i386.exe -drive format=raw,file=hdd-
  2gb.img -soundhw pcspk,sb16 -m 16 -cpu pentium -vga std -cdrom
  Windows_95.iso -boot c"

  - I have attached video screen capture of the issue

  ---

  I decided to make my first ever QEMU build after encountering the
  dsound issues using the latest 4.2.0 binary from
  https://qemu.weilnetz.de/w64/. In my 5.0.0-rc3 build the sound
  playback is working correctly, however the whole Windows 95 UI freezes
  while sound is playing.

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