I was saying the libsdl packages have a USE flag "sound" which builds the sound module for sdl. So if qemu makes any calls to the sound module not pure alsa calls, that might be causing your issue.
Wabes USE flag output shows he's building sdl with the "sound" use flag enabled and not just alsa alone. On Thu, Dec 24, 2015, 22:26 <waben...@gmail.com> wrote: > waltd...@waltdnes.org wrote: > > > On Thu, Dec 24, 2015 at 10:48:28PM +0000, Ian Bloss wrote > > > Libsdl and libsdl2 built with sound use flag on host? > > > > I didn't bother enabling alsa except for packages that actually need > > it. I've enabled it for libsdl, but not for sdl2, because I didn't > > realize libsdl2 even existed. According to equery, the only package > > pulling in libsdl2 is qemu, and that's because I set the flag. If I > > remove the "alsa2" flag from qemu, will it work properly with "alsa" > > alone? > > On my host system I use alsa and no pulseaudio. However it doesn't > make any difference if I set the alsa USE-flag for qemu or not. > > I don't know if qemu runs flawless without sdl2 USE-flag. But you can > easily test this. > > Btw. Since I reverted from qemu-2.5.0 back to qemu-2.4.1-r2, qemu > hangs no longer when I specify ac97, hda or es1370 as sound hardware > emulation. But I have to start the xfce mixer application on the > guest OS after the desktop is loaded. If I don't do this, then one > core on my host is always at 100% load and qemu is slow and sometimes > doesn't respond for some seconds. But no error message appears on > guest or host. > Strange is, that the guest OS doesn't show a high load but only the > host OS. After I started the xfce-mixer app on guest OS, everything > is smooth and host load count normalizes. > > I now use qemu with "-soundhw es1370" and am have automated the start > of the mixer app. With this, sound is working fine. > > As I already said, when I use sb16 or gus then I have no sound at all. > Only ac97, hda and es1370 are working for me. Maybe this has something > to do with the guest OS. > > Here are the USE-flags that I use for qemu, libsdl and libsdl2. > > app-emulation/qemu-2.4.1-r2 aio caps curl fdt filecaps gtk gtk2 jpeg lzo > ncurses nfs nls opengl pin-upstream-blobs png python sasl sdl sdl2 seccomp > spice threads usb uuid vde vhost-net vnc xattr xfs -accessibility -alsa > -bluetooth -debug -glusterfs -infiniband -iscsi -numa -pulseaudio -rbd > -selinux -smartcard -snappy -ssh -static -static-softmmu -static-user > -systemtap -tci -test -tls -usbredir -virtfs -vte -xen > > media-libs/libsdl-1.2.15-r9 X alsa dga fbcon joystick opengl oss sound > video xv -aalib -custom-cflags -libcaca -nas -pulseaudio -static-libs > -tslib -xinerama > > media-libs/libsdl2-2.0.3-r200 X alsa dbus joystick opengl oss sound > threads udev video xscreensaver -altivec -custom-cflags -fusionsound -gles > -haptic -nas -pulseaudio -static-libs -tslib -wayland -xinerama > > -- > Regards > wabe > >
