[Qemu-devel] [Bug 1583420] Re: Please support "-soundhw none"

[Paolo Bonzini]

Actually, QEMU doesn't provide a default set of sound hardware.

The pcspk device provides port 0x61 and like most other legacy ISA
devices is not removed by -nodefaults (i8254 PIT, i8257 DMA, i8259 PIC;
only the serial port can be removed).

However, unless you configure it specifically with "-soundhw pcspk", the
pcspk device does not emit any audio and is little more than an bolted-
on piece of the PIT device model.  You can check it yourself by placing
a breakpoint on pcspk_audio_init and pcspk_realizefn.  With -nodefaults,
the latter does run, just like with no command line option, but
pcspk_audio_init is not called.  With -soundhw pcspk, both are called.

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

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https://bugs.launchpad.net/bugs/1583420

Title:
  Please support "-soundhw none"

Status in QEMU:
  Invalid

Bug description:
  qemu currently provides a default set of sound hardware.  The -soundhw
  option can change that default set, such as by using "-soundhw pcspkr"
  to disable most of it, but no "-soundhw none" option exists to disable
  all of it.  As far as I can tell, disabling the default sound hardware
  requires specifying -nodefaults and then manually specifying all the
  desired hardware, leaving out sound hardware.

  Please consider adding support for "-soundhw none", to disable all the
  default sound hardware.

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