LinuxQuestions.org - [KERNEL] 2.6 preempt no smooth audio?

successfully working on a 2.4.2x i switched to 2.6
in need of the acpi features to put the libretto to
memsuspend. however, i can't get unbroken play
-back (file or stream) anymore.
disabling 2.6 preempt on makes it bit better, but don't
reach the behavior of a preempt & lowlat'd 2.4.2x.

sound scratches are mainly when switching through
workspaces (lot of drawing/cpu). 2.4 is all right.

mobile p233 mmx, 64M

[...] kernel
kernel: ad1848/cs4248 codec driver Copyright (C) by Hannu Savolainen 1993-1996
kernel: opl3sa2: Found OPL3-SA3 (YMF715E or YMF719E)
kernel: YM3812 and OPL-3 driver Copyright (C) by Hannu Sav olainen, Rob Hooft 1993-1996
[...]

[...] XFree86log
(--) PCI:*(0:4:0) Neomagic Corporation NM2160 [MagicGraph 128XD] rev 1, Mem @ 0x
fd000000/24, 0xffc00000/21, 0xffb00000/20
[...]

[...] lspci
0000:00:04.0 VGA compatible controller: Neomagic Corporation NM2160 [MagicGraph 128XD] (rev 01) (prog-if 00 [VGA])
Subsystem: Toshiba America Info Systems: Unknown device 0001
Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Interrupt: pin A routed to IRQ 255
Region 0: Memory at fd000000 (32-bit, prefetchable) [size=16M]
Region 1: Memory at ffc00000 (32-bit, non-prefetchable) [size=2M]
Region 2: Memory at ffb00000 (32-bit, non-prefetchable) [size=1M]
[...]

the complete system hardware is quite exotic; the lspci output
is scary, so are the dmesg-error messages from acpi (but, iirc,
harmless and with 2.4 also). ide-dma and changing pci latency
timers don't work. [plug'n'pray/acpi]toshiba controller & yenta
compatible pcmcia/pccard controller..

isn't preempt involved in trying to get the system more responsible
and to work with audio/video/media more comfortable?
if i'd like to switch back: is there a backport from the current (2.6)
acpi subsystem for 2.4-kernel's avail?

now, 2.4 *is* fast / responsive! what do do?

thx,
mritch.