if I start up X i get the following error:
Sound server warning message:
Can't set real-time scheduling priority.
You need to run artswrapper as root or
setuid root. This means that you will
likely not be able to produce acceptable
sound (i.e. without clicks and breaks).

if i run artswrapper as root i get this message: i think it might be related to the following problem:

i don't get why my ac3 passtrough isn't working for xmms or realplayer files when using mplayer. i don't have any problems when playing a dvd with xine or mplayer, but sound doesn't work for anything else than a dvd.
here's my xmms output when playing a mp3:
$ xmmsMessage: output format: 5

and my mplayer output when trying to play a .rm file (realplayer):

REAL file format detected.skip_str: 12 bytes skippedskip_str: 20 bytes skipped=3D=3D=3D=3D=3D=3D=3D WAVE Format =3D=3D=3D=3D=3D=3D=3DFormat Tag: 28515 (0x6F63)Channels: 2Samplerate: 44100avg byte/sec: 44100Block align: 640bits/sample: 16cbSize: 26Unknown extra header dump: [80] [0] [10] [0] [16] [0] [80] [2] [10] [0] [=1] [0] [0] [3] [8] [0] [0] [20] [0] [0] [0] [0] [0] [5] [0] [5]skip_str: 12 bytes skippedskip_str: 20 bytes skippedskip_str: 0 bytes skippedskip_str: 16 bytes skippedNot audio/video stream or unsupported!Reading index table from index chunk (3222318)size: 874 bytesentries: 61stream_id: 0next_header_pos: 3223192Reading index table from index chunk (3223192)size: 958 bytesentries: 67stream_id: 1next_header_pos: 3224150Reading index table from index chunk (3224150)size: 20 bytesentries: 0stream_id: 2next_header_pos: 0VIDEO: RV30 [30202002,010A9030] 360x288 (aspect 0.00) 25.00 fpsClip info: name: Baakinson copyright: =A92003=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D==3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D==3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3DTrying to force audio codec driver family hwac3 ...Opening audio decoder: [realaud] RealAudio decoderopening shared obj '/usr/lib/win32/cook.so.6.0'Audio codec: [22] 44 Kbps Stereo Music - RA8Audio bitrate: 44.100 kbit/s (5513 bps)AUDIO: 44100 Hz, 2 ch, 16 bit (0x10), ratio: 5513->176400 (44.1 kbit)Selected audio codec: [racook] afm:realaud (RealAudio COOK)=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D==3D=3D=3D=3D=3D=3D= 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D==3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= 3D=3D=3D=3D=3D=3D=3D=3D=3D=3DOpening video filter: [pp]=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D==3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D==3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3DTrying to force video codec driver family libmpeg2 ...Opening video decoder: [realvid] RealVideo decoderopening shared obj '/usr/lib/win32/drv3.so.6.0'Selected video codec: [rv30] vfm:realvid (Linux RealPlayer 8 RV30 decoder=)=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D==3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D==3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D[PP] Using external postprocessing filter, max q =3D 6.Checking audio filter chain for 44100Hz/2ch/16bit -> 44100Hz/2ch/16bit...AF_pre: af format: 2 bps, 2 ch, 44100 hz, little endian signed intAF_pre: 44100Hz 2ch Signed 16-bit (Little-Endian)alsa-init: testing and bugreports are welcome.alsa-init: requested format: 44100 Hz, 2 channels, Signed 16-bit (Little-=Endian)alsa-init: 1 soundcard found, using: hw:0,0alsa9: 44100 Hz/2 channels/4 bpf/65536 bytes buffer/Signed 16 bit Little =EndianAO: [alsa9] 44100Hz 2ch Signed 16-bit (Little-Endian) (2 bps)Building audio filter chain for 44100Hz/2ch/16bit -> 44100Hz/2ch/16bit...Starting playback...VDec: vo config request - 360 x 288 (preferred csp: Planar I420)[PP] Using external postprocessing filter, max q =3D 6.VDec: using Planar I420 as output csp (no 0)Movie-Aspect is 1.25:1 - prescaling to correct movie aspect.VO: [xv] 360x288 =3D> 360x288 Planar I420alsa-uninit: pcm closed-0.001 ct: 0.138 410/410 6% 6% 1.2% 0 6 75%Exiting... (Quit)


i'm having this problem for a long time now with several distros, so i guess this is simply a configuration question.
i'm running kernel-2.6.0-test11 with built in alsa-drivers or kernel-2.4.22 with manually built alsa-drivers (0.9.8).

i don't have a clue what to do next, so i'm grateful for any hint.