Software :: Flash Player : No Sound / Get It Again?

Ever since I replaced my old Radeon HD 3850 AGP card with a Radeon HD 4830 PCIE one, Flash Player (v. 10.3.181.14) is a mess:
- no hardware video acceleration (full screen playback unbelievably slow)
- no audio

Only flash plugin is concerned; hardware video acceleration and audio seems to be present in other applications. (First skype also had no sound, but that could be set by selecting the onboard analog audio device instead of the default).

System:
mobo: asrock 4coredual sata2 rev.2
cpu: Intel Pentium(R) Dual-Core E6300 @ 2.80GHz
kernel: 2.6.34.8-0.2-default
system: SuSE 11.3
flash: 10.3.181.14

In this specific case, even yast is confused: I can configure the mobo audio device in it, but nothing else works in yast: no audible test sound, no possibility to set volume for the mobo audio device, as no volume controls are shown. (It may happen that yast "shows" the non-existing radeon hdaudio device controls, instead)
Kmix is better: it shows both audio devices and all controls and all work (this means there are no controls for the radeon hdaudio device - but I do no miss them, as I do not want to use that device).

Is there a way to:
- disable the radeon hd audio device so that linux get into a more friendy hardware environment?
- is there a way to do this in linux (alsa)? (of course everything works in xp, this time, too)