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Old 11-22-2004, 08:56 PM   #1
Registered: Nov 2003
Location: austria
Distribution: debian
Posts: 667

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[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?


Last edited by mritch; 11-24-2004 at 12:47 AM.
Old 11-24-2004, 12:52 AM   #2
Registered: Nov 2003
Location: austria
Distribution: debian
Posts: 667

Original Poster
Rep: Reputation: 30
Old 11-24-2004, 01:25 AM   #3
Registered: Aug 2004
Posts: 130

Rep: Reputation: 15
2.6 kernel is not so stable, so you may want to upgrade to the latest version to follow the development pace, if the problem still exists in the latest version, you may issue a bug report to the kernel mailing list.


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