[Qemu-devel] [Bug 1295587] [NEW] Temporal freeze and slowdown while using emulated sb16

[Qemu-devel] [Bug 1295587] [NEW] Temporal freeze and slowdown while using emulated sb16

[alvarez]

Public bug reported:

I have been carrying around this bug since previous versions and on
different machines: When I use the -soundhw sb16 option, while playing
any sound on the virtual machine it temporally freezes the emulated
machine and loops the last bit of such sound effect for 1-2 minutes,
then goes back to normal speed (until a new sound is played).

Console shows:

 sb16: warning: command 0xf9,1 is not truly understood yet
 sb16: warning: command 0xf9,1 is not truly understood yet
(...)
main-loop: WARNING: I/O thread spun for 1000 iterations

-One of my emulated machines is Windows 3.11: I managed to overrun this
bug by switching from the local 1.5 version of the sound blaster driver
to the 1.0, although since I updated qemu it freezes that machine, so I
can't test if it still works.

I am using the 1.7.90 version, but I suffered this bug for over one year

this bug happens anytime I use the -soundhw sb16 switch, but the full
command I am using in this specific case is:

qemu-system-i386 -localtime -cpu pentium -m 32 -display sdl -vga cirrus
-hda c.img -cdrom win95stuff.iso -net nic,model=ne2k_pci -net user
-soundhw sb16

** Affects: qemu
     Importance: Undecided
         Status: New


** Tags: sb16

** Description changed:

  I have been carrying around this bug since previous versions and on
  different machines: When I use the -soundhw sb16 option, while playing
- any sound on the virtual machine it freezes and loops the last bit of
- such sound effect for 1-2 minutes, then goes back to normal speed.
+ any sound on the virtual machine it temporally freezes the emulated
+ machine and loops the last bit of such sound effect for 1-2 minutes,
+ then goes back to normal speed (until a new sound is played).
  
  Console shows:
  
-  sb16: warning: command 0xf9,1 is not truly understood yet
-  sb16: warning: command 0xf9,1 is not truly understood yet
+  sb16: warning: command 0xf9,1 is not truly understood yet
+  sb16: warning: command 0xf9,1 is not truly understood yet
  (...)
  main-loop: WARNING: I/O thread spun for 1000 iterations
  
  -One of my emulated machines is Windows 3.11: I managed to overrun this
  bug by switching from the local 1.5 version of the sound blaster driver
  to the 1.0, although since I updated qemu it freezes that machine, so I
  can't test if it still works.
  
  I am using the 1.7.90 version, but I suffered this bug for over one year
  
  this bug happens anytime I use the -soundhw sb16 switch, but the full
  command I am using in this specific case is:
  
- 
- qemu-system-i386 -localtime -cpu pentium -m 32 -display sdl -vga cirrus -hda c.img -cdrom win95stuff.iso -net nic,model=ne2k_pci -net user -soundhw sb16
+ qemu-system-i386 -localtime -cpu pentium -m 32 -display sdl -vga cirrus
+ -hda c.img -cdrom win95stuff.iso -net nic,model=ne2k_pci -net user
+ -soundhw sb16

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https://bugs.launchpad.net/bugs/1295587

Title:
  Temporal freeze and slowdown while using emulated sb16

Status in QEMU:
  New

Bug description:
  I have been carrying around this bug since previous versions and on
  different machines: When I use the -soundhw sb16 option, while playing
  any sound on the virtual machine it temporally freezes the emulated
  machine and loops the last bit of such sound effect for 1-2 minutes,
  then goes back to normal speed (until a new sound is played).

  Console shows:

   sb16: warning: command 0xf9,1 is not truly understood yet
   sb16: warning: command 0xf9,1 is not truly understood yet
  (...)
  main-loop: WARNING: I/O thread spun for 1000 iterations

  -One of my emulated machines is Windows 3.11: I managed to overrun
  this bug by switching from the local 1.5 version of the sound blaster
  driver to the 1.0, although since I updated qemu it freezes that
  machine, so I can't test if it still works.

  I am using the 1.7.90 version, but I suffered this bug for over one
  year

  this bug happens anytime I use the -soundhw sb16 switch, but the full
  command I am using in this specific case is:

  qemu-system-i386 -localtime -cpu pentium -m 32 -display sdl -vga
  cirrus -hda c.img -cdrom win95stuff.iso -net nic,model=ne2k_pci -net
  user -soundhw sb16

To manage notifications about this bug go to:
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[Qemu-devel] [Bug 1295587] Re: Temporal freeze and slowdown while using emulated sb16

[alvarez]

** Description changed:

  I have been carrying around this bug since previous versions and on
  different machines: When I use the -soundhw sb16 option, while playing
  any sound on the virtual machine it temporally freezes the emulated
  machine and loops the last bit of such sound effect for 1-2 minutes,
  then goes back to normal speed (until a new sound is played).
  
  Console shows:
  
   sb16: warning: command 0xf9,1 is not truly understood yet
   sb16: warning: command 0xf9,1 is not truly understood yet
  (...)
  main-loop: WARNING: I/O thread spun for 1000 iterations
  
  -One of my emulated machines is Windows 3.11: I managed to overrun this
  bug by switching from the local 1.5 version of the sound blaster driver
  to the 1.0, although since I updated qemu it freezes that machine, so I
  can't test if it still works.
  
  I am using the 1.7.90 version, but I suffered this bug for over one year
+ (confirmed in version 2.0.0-rc0 too)
  
  this bug happens anytime I use the -soundhw sb16 switch, but the full
  command I am using in this specific case is:
  
  qemu-system-i386 -localtime -cpu pentium -m 32 -display sdl -vga cirrus
  -hda c.img -cdrom win95stuff.iso -net nic,model=ne2k_pci -net user
  -soundhw sb16

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https://bugs.launchpad.net/bugs/1295587

Title:
  Temporal freeze and slowdown while using emulated sb16

Status in QEMU:
  New

Bug description:
  I have been carrying around this bug since previous versions and on
  different machines: When I use the -soundhw sb16 option, while playing
  any sound on the virtual machine it temporally freezes the emulated
  machine and loops the last bit of such sound effect for 1-2 minutes,
  then goes back to normal speed (until a new sound is played).

  Console shows:

   sb16: warning: command 0xf9,1 is not truly understood yet
   sb16: warning: command 0xf9,1 is not truly understood yet
  (...)
  main-loop: WARNING: I/O thread spun for 1000 iterations

  -One of my emulated machines is Windows 3.11: I managed to overrun
  this bug by switching from the local 1.5 version of the sound blaster
  driver to the 1.0, although since I updated qemu it freezes that
  machine, so I can't test if it still works.

  I am using the 1.7.90 version, but I suffered this bug for over one
  year (confirmed in version 2.0.0-rc0 too)

  this bug happens anytime I use the -soundhw sb16 switch, but the full
  command I am using in this specific case is:

  qemu-system-i386 -localtime -cpu pentium -m 32 -display sdl -vga
  cirrus -hda c.img -cdrom win95stuff.iso -net nic,model=ne2k_pci -net
  user -soundhw sb16

To manage notifications about this bug go to:
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[Qemu-devel] [Bug 1295587] Re: Temporal freeze and slowdown while using emulated sb16

[alvarez]

** Description changed:

  I have been carrying around this bug since previous versions and on
  different machines: When I use the -soundhw sb16 option, while playing
  any sound on the virtual machine it temporally freezes the emulated
  machine and loops the last bit of such sound effect for 1-2 minutes,
  then goes back to normal speed (until a new sound is played).
  
  Console shows:
  
   sb16: warning: command 0xf9,1 is not truly understood yet
   sb16: warning: command 0xf9,1 is not truly understood yet
  (...)
  main-loop: WARNING: I/O thread spun for 1000 iterations
  
  -One of my emulated machines is Windows 3.11: I managed to overrun this
  bug by switching from the local 1.5 version of the sound blaster driver
  to the 1.0, although since I updated qemu it freezes that machine, so I
  can't test if it still works.
  
  I am using the 1.7.90 version, but I suffered this bug for over one year
  (confirmed in version 2.0.0-rc0 too)
  
  this bug happens anytime I use the -soundhw sb16 switch, but the full
  command I am using in this specific case is:
  
  qemu-system-i386 -localtime -cpu pentium -m 32 -display sdl -vga cirrus
  -hda c.img -cdrom win95stuff.iso -net nic,model=ne2k_pci -net user
  -soundhw sb16
+ 
+ This bug appears on all my machines: Pentium III running Slackware 13.0
+ and freeBSD 10; Dual core T2400, both in Arch, Gentoo and Slackware 14.1
+ (all 32 bits), and a Dual core T4400 64 bits with Gentoo and Slackware.
+ Same problem in all of those systems after compiling instead of using
+ the distro packages....

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1295587

Title:
  Temporal freeze and slowdown while using emulated sb16

Status in QEMU:
  New

Bug description:
  I have been carrying around this bug since previous versions and on
  different machines: When I use the -soundhw sb16 option, while playing
  any sound on the virtual machine it temporally freezes the emulated
  machine and loops the last bit of such sound effect for 1-2 minutes,
  then goes back to normal speed (until a new sound is played).

  Console shows:

   sb16: warning: command 0xf9,1 is not truly understood yet
   sb16: warning: command 0xf9,1 is not truly understood yet
  (...)
  main-loop: WARNING: I/O thread spun for 1000 iterations

  -One of my emulated machines is Windows 3.11: I managed to overrun
  this bug by switching from the local 1.5 version of the sound blaster
  driver to the 1.0, although since I updated qemu it freezes that
  machine, so I can't test if it still works.

  I am using the 1.7.90 version, but I suffered this bug for over one
  year (confirmed in version 2.0.0-rc0 too)

  this bug happens anytime I use the -soundhw sb16 switch, but the full
  command I am using in this specific case is:

  qemu-system-i386 -localtime -cpu pentium -m 32 -display sdl -vga
  cirrus -hda c.img -cdrom win95stuff.iso -net nic,model=ne2k_pci -net
  user -soundhw sb16

  This bug appears on all my machines: Pentium III running Slackware
  13.0 and freeBSD 10; Dual core T2400, both in Arch, Gentoo and
  Slackware 14.1 (all 32 bits), and a Dual core T4400 64 bits with
  Gentoo and Slackware. Same problem in all of those systems after
  compiling instead of using the distro packages....

To manage notifications about this bug go to:
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[Qemu-devel] [Bug 1295587] Re: Temporal freeze and slowdown while using emulated sb16

[Cole Robinson]

sb16 isn't actively maintained in qemu these days, so it's unlikely this
bug fix will be prioritized.

that said, if you help narrow down the commit where this regressed, it
will increase your chances.

Finding the last working qemu version is a start. From there, consider
trying a git bisect to locate the exact commit that caused failure.

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Title:
  Temporal freeze and slowdown while using emulated sb16

Status in QEMU:
  New

Bug description:
  I have been carrying around this bug since previous versions and on
  different machines: When I use the -soundhw sb16 option, while playing
  any sound on the virtual machine it temporally freezes the emulated
  machine and loops the last bit of such sound effect for 1-2 minutes,
  then goes back to normal speed (until a new sound is played).

  Console shows:

   sb16: warning: command 0xf9,1 is not truly understood yet
   sb16: warning: command 0xf9,1 is not truly understood yet
  (...)
  main-loop: WARNING: I/O thread spun for 1000 iterations

  -One of my emulated machines is Windows 3.11: I managed to overrun
  this bug by switching from the local 1.5 version of the sound blaster
  driver to the 1.0, although since I updated qemu it freezes that
  machine, so I can't test if it still works.

  I am using the 1.7.90 version, but I suffered this bug for over one
  year (confirmed in version 2.0.0-rc0 too)

  this bug happens anytime I use the -soundhw sb16 switch, but the full
  command I am using in this specific case is:

  qemu-system-i386 -localtime -cpu pentium -m 32 -display sdl -vga
  cirrus -hda c.img -cdrom win95stuff.iso -net nic,model=ne2k_pci -net
  user -soundhw sb16

  This bug appears on all my machines: Pentium III running Slackware
  13.0 and freeBSD 10; Dual core T2400, both in Arch, Gentoo and
  Slackware 14.1 (all 32 bits), and a Dual core T4400 64 bits with
  Gentoo and Slackware. Same problem in all of those systems after
  compiling instead of using the distro packages....

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1295587/+subscriptions

[Qemu-devel] [Bug 1295587] Re: Temporal freeze and slowdown while using emulated sb16

[alvarez]

Wow, I didn't know sb16 is not mantained anymore, in fact I tough it was
one of the main "features"!

I will try to do that when I have time. Maybe with a diff on both source
codes will put some light on. Thank you!

-- 
You received this bug notification because you are a member of qemu-
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https://bugs.launchpad.net/bugs/1295587

Title:
  Temporal freeze and slowdown while using emulated sb16

Status in QEMU:
  New

Bug description:
  I have been carrying around this bug since previous versions and on
  different machines: When I use the -soundhw sb16 option, while playing
  any sound on the virtual machine it temporally freezes the emulated
  machine and loops the last bit of such sound effect for 1-2 minutes,
  then goes back to normal speed (until a new sound is played).

  Console shows:

   sb16: warning: command 0xf9,1 is not truly understood yet
   sb16: warning: command 0xf9,1 is not truly understood yet
  (...)
  main-loop: WARNING: I/O thread spun for 1000 iterations

  -One of my emulated machines is Windows 3.11: I managed to overrun
  this bug by switching from the local 1.5 version of the sound blaster
  driver to the 1.0, although since I updated qemu it freezes that
  machine, so I can't test if it still works.

  I am using the 1.7.90 version, but I suffered this bug for over one
  year (confirmed in version 2.0.0-rc0 too)

  this bug happens anytime I use the -soundhw sb16 switch, but the full
  command I am using in this specific case is:

  qemu-system-i386 -localtime -cpu pentium -m 32 -display sdl -vga
  cirrus -hda c.img -cdrom win95stuff.iso -net nic,model=ne2k_pci -net
  user -soundhw sb16

  This bug appears on all my machines: Pentium III running Slackware
  13.0 and freeBSD 10; Dual core T2400, both in Arch, Gentoo and
  Slackware 14.1 (all 32 bits), and a Dual core T4400 64 bits with
  Gentoo and Slackware. Same problem in all of those systems after
  compiling instead of using the distro packages....

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1295587/+subscriptions

[Qemu-devel] [Bug 1295587] Re: Temporal freeze and slowdown while using emulated sb16

[milasudril]

On Windows 98 SE:

 * SB16: System hangs as described in this bug report
 * ES1370: Causes system freeze with back screen at boot time
 * AC97 (as suggested here: https://smcv.pseudorandom.co.uk/2015/discworldnoir/): BSODs during the installation
 * GUS: Device is not even detected

Conclusion: At the moment, there is no way to get audio output from
Windows 98 se VM.

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https://bugs.launchpad.net/bugs/1295587

Title:
  Temporal freeze and slowdown while using emulated sb16

Status in QEMU:
  New

Bug description:
  I have been carrying around this bug since previous versions and on
  different machines: When I use the -soundhw sb16 option, while playing
  any sound on the virtual machine it temporally freezes the emulated
  machine and loops the last bit of such sound effect for 1-2 minutes,
  then goes back to normal speed (until a new sound is played).

  Console shows:

   sb16: warning: command 0xf9,1 is not truly understood yet
   sb16: warning: command 0xf9,1 is not truly understood yet
  (...)
  main-loop: WARNING: I/O thread spun for 1000 iterations

  -One of my emulated machines is Windows 3.11: I managed to overrun
  this bug by switching from the local 1.5 version of the sound blaster
  driver to the 1.0, although since I updated qemu it freezes that
  machine, so I can't test if it still works.

  I am using the 1.7.90 version, but I suffered this bug for over one
  year (confirmed in version 2.0.0-rc0 too)

  this bug happens anytime I use the -soundhw sb16 switch, but the full
  command I am using in this specific case is:

  qemu-system-i386 -localtime -cpu pentium -m 32 -display sdl -vga
  cirrus -hda c.img -cdrom win95stuff.iso -net nic,model=ne2k_pci -net
  user -soundhw sb16

  This bug appears on all my machines: Pentium III running Slackware
  13.0 and freeBSD 10; Dual core T2400, both in Arch, Gentoo and
  Slackware 14.1 (all 32 bits), and a Dual core T4400 64 bits with
  Gentoo and Slackware. Same problem in all of those systems after
  compiling instead of using the distro packages....

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1295587/+subscriptions

[Qemu-devel] [Bug 1295587] Re: Temporal freeze and slowdown while using emulated sb16

[milasudril]

Addendum: Since this report is from 2014, I should mention that I am
currently on 16.04.

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Title:
  Temporal freeze and slowdown while using emulated sb16

Status in QEMU:
  New

Bug description:
  I have been carrying around this bug since previous versions and on
  different machines: When I use the -soundhw sb16 option, while playing
  any sound on the virtual machine it temporally freezes the emulated
  machine and loops the last bit of such sound effect for 1-2 minutes,
  then goes back to normal speed (until a new sound is played).

  Console shows:

   sb16: warning: command 0xf9,1 is not truly understood yet
   sb16: warning: command 0xf9,1 is not truly understood yet
  (...)
  main-loop: WARNING: I/O thread spun for 1000 iterations

  -One of my emulated machines is Windows 3.11: I managed to overrun
  this bug by switching from the local 1.5 version of the sound blaster
  driver to the 1.0, although since I updated qemu it freezes that
  machine, so I can't test if it still works.

  I am using the 1.7.90 version, but I suffered this bug for over one
  year (confirmed in version 2.0.0-rc0 too)

  this bug happens anytime I use the -soundhw sb16 switch, but the full
  command I am using in this specific case is:

  qemu-system-i386 -localtime -cpu pentium -m 32 -display sdl -vga
  cirrus -hda c.img -cdrom win95stuff.iso -net nic,model=ne2k_pci -net
  user -soundhw sb16

  This bug appears on all my machines: Pentium III running Slackware
  13.0 and freeBSD 10; Dual core T2400, both in Arch, Gentoo and
  Slackware 14.1 (all 32 bits), and a Dual core T4400 64 bits with
  Gentoo and Slackware. Same problem in all of those systems after
  compiling instead of using the distro packages....

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1295587/+subscriptions

[Qemu-devel] [Bug 1295587] Re: Temporal freeze and slowdown while using emulated sb16

[Blake Lee]

Is there any fix or workaround for this bug? Some old games won't use
the AC97 and require SB16.

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You received this bug notification because you are a member of qemu-
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https://bugs.launchpad.net/bugs/1295587

Title:
  Temporal freeze and slowdown while using emulated sb16

Status in QEMU:
  New

Bug description:
  I have been carrying around this bug since previous versions and on
  different machines: When I use the -soundhw sb16 option, while playing
  any sound on the virtual machine it temporally freezes the emulated
  machine and loops the last bit of such sound effect for 1-2 minutes,
  then goes back to normal speed (until a new sound is played).

  Console shows:

   sb16: warning: command 0xf9,1 is not truly understood yet
   sb16: warning: command 0xf9,1 is not truly understood yet
  (...)
  main-loop: WARNING: I/O thread spun for 1000 iterations

  -One of my emulated machines is Windows 3.11: I managed to overrun
  this bug by switching from the local 1.5 version of the sound blaster
  driver to the 1.0, although since I updated qemu it freezes that
  machine, so I can't test if it still works.

  I am using the 1.7.90 version, but I suffered this bug for over one
  year (confirmed in version 2.0.0-rc0 too)

  this bug happens anytime I use the -soundhw sb16 switch, but the full
  command I am using in this specific case is:

  qemu-system-i386 -localtime -cpu pentium -m 32 -display sdl -vga
  cirrus -hda c.img -cdrom win95stuff.iso -net nic,model=ne2k_pci -net
  user -soundhw sb16

  This bug appears on all my machines: Pentium III running Slackware
  13.0 and freeBSD 10; Dual core T2400, both in Arch, Gentoo and
  Slackware 14.1 (all 32 bits), and a Dual core T4400 64 bits with
  Gentoo and Slackware. Same problem in all of those systems after
  compiling instead of using the distro packages....

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1295587/+subscriptions

[Bug 1295587] Re: Temporal freeze and slowdown while using emulated sb16

[Amaro Jr]

After banging my head in a wall for tree or four days, I got the ac97 to
work on windows 98se applying something called "Auto-patcher for windows
98se" downloaded from retrosystemsrevival, then using the windows 95
"VXD_A406" driver updated manually by unpacking the executable and
picking the .inf file manually. The auto-patcher is mandatory to get
everything working. I followed steps from a youtube video for creating a
windows 98 VM in Virtualbox, worked on qemu. The installation process
was long and boring, but in the end, everything seems to be working
without problems (so far). All links can be found in a youtube video by
the name "Windows 98 on VirualBox Part 2. AutoPatching, AC97 Sound
Drivers, Windows 98 Plus! Gamepad Install." or in the following
pastebin: https://pastebin.com/hMvcMzFL

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1295587

Title:
  Temporal freeze and slowdown while using emulated sb16

Status in QEMU:
  New

Bug description:
  I have been carrying around this bug since previous versions and on
  different machines: When I use the -soundhw sb16 option, while playing
  any sound on the virtual machine it temporally freezes the emulated
  machine and loops the last bit of such sound effect for 1-2 minutes,
  then goes back to normal speed (until a new sound is played).

  Console shows:

   sb16: warning: command 0xf9,1 is not truly understood yet
   sb16: warning: command 0xf9,1 is not truly understood yet
  (...)
  main-loop: WARNING: I/O thread spun for 1000 iterations

  -One of my emulated machines is Windows 3.11: I managed to overrun
  this bug by switching from the local 1.5 version of the sound blaster
  driver to the 1.0, although since I updated qemu it freezes that
  machine, so I can't test if it still works.

  I am using the 1.7.90 version, but I suffered this bug for over one
  year (confirmed in version 2.0.0-rc0 too)

  this bug happens anytime I use the -soundhw sb16 switch, but the full
  command I am using in this specific case is:

  qemu-system-i386 -localtime -cpu pentium -m 32 -display sdl -vga
  cirrus -hda c.img -cdrom win95stuff.iso -net nic,model=ne2k_pci -net
  user -soundhw sb16

  This bug appears on all my machines: Pentium III running Slackware
  13.0 and freeBSD 10; Dual core T2400, both in Arch, Gentoo and
  Slackware 14.1 (all 32 bits), and a Dual core T4400 64 bits with
  Gentoo and Slackware. Same problem in all of those systems after
  compiling instead of using the distro packages....

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1295587/+subscriptions

[Bug 1295587] Re: Temporal freeze and slowdown while using emulated sb16

[Thomas Huth]

The QEMU project is currently considering to move its bug tracking to
another system. For this we need to know which bugs are still valid
and which could be closed already. Thus we are setting older bugs to
"Incomplete" now.

If you still think this bug report here is valid, then please switch
the state back to "New" within the next 60 days, otherwise this report
will be marked as "Expired". Or please mark it as "Fix Released" if
the problem has been solved with a newer version of QEMU already.

Thank you and sorry for the inconvenience.


** Changed in: qemu
       Status: New => Incomplete

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Title:
  Temporal freeze and slowdown while using emulated sb16

Status in QEMU:
  Incomplete

Bug description:
  I have been carrying around this bug since previous versions and on
  different machines: When I use the -soundhw sb16 option, while playing
  any sound on the virtual machine it temporally freezes the emulated
  machine and loops the last bit of such sound effect for 1-2 minutes,
  then goes back to normal speed (until a new sound is played).

  Console shows:

   sb16: warning: command 0xf9,1 is not truly understood yet
   sb16: warning: command 0xf9,1 is not truly understood yet
  (...)
  main-loop: WARNING: I/O thread spun for 1000 iterations

  -One of my emulated machines is Windows 3.11: I managed to overrun
  this bug by switching from the local 1.5 version of the sound blaster
  driver to the 1.0, although since I updated qemu it freezes that
  machine, so I can't test if it still works.

  I am using the 1.7.90 version, but I suffered this bug for over one
  year (confirmed in version 2.0.0-rc0 too)

  this bug happens anytime I use the -soundhw sb16 switch, but the full
  command I am using in this specific case is:

  qemu-system-i386 -localtime -cpu pentium -m 32 -display sdl -vga
  cirrus -hda c.img -cdrom win95stuff.iso -net nic,model=ne2k_pci -net
  user -soundhw sb16

  This bug appears on all my machines: Pentium III running Slackware
  13.0 and freeBSD 10; Dual core T2400, both in Arch, Gentoo and
  Slackware 14.1 (all 32 bits), and a Dual core T4400 64 bits with
  Gentoo and Slackware. Same problem in all of those systems after
  compiling instead of using the distro packages....

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[Bug 1295587] Re: Temporal freeze and slowdown while using emulated sb16

[Launchpad Bug Tracker]

[Expired for QEMU because there has been no activity for 60 days.]

** Changed in: qemu
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1295587

Title:
  Temporal freeze and slowdown while using emulated sb16

Status in QEMU:
  Expired

Bug description:
  I have been carrying around this bug since previous versions and on
  different machines: When I use the -soundhw sb16 option, while playing
  any sound on the virtual machine it temporally freezes the emulated
  machine and loops the last bit of such sound effect for 1-2 minutes,
  then goes back to normal speed (until a new sound is played).

  Console shows:

   sb16: warning: command 0xf9,1 is not truly understood yet
   sb16: warning: command 0xf9,1 is not truly understood yet
  (...)
  main-loop: WARNING: I/O thread spun for 1000 iterations

  -One of my emulated machines is Windows 3.11: I managed to overrun
  this bug by switching from the local 1.5 version of the sound blaster
  driver to the 1.0, although since I updated qemu it freezes that
  machine, so I can't test if it still works.

  I am using the 1.7.90 version, but I suffered this bug for over one
  year (confirmed in version 2.0.0-rc0 too)

  this bug happens anytime I use the -soundhw sb16 switch, but the full
  command I am using in this specific case is:

  qemu-system-i386 -localtime -cpu pentium -m 32 -display sdl -vga
  cirrus -hda c.img -cdrom win95stuff.iso -net nic,model=ne2k_pci -net
  user -soundhw sb16

  This bug appears on all my machines: Pentium III running Slackware
  13.0 and freeBSD 10; Dual core T2400, both in Arch, Gentoo and
  Slackware 14.1 (all 32 bits), and a Dual core T4400 64 bits with
  Gentoo and Slackware. Same problem in all of those systems after
  compiling instead of using the distro packages....

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1295587/+subscriptions