On Wed, Mar 22, 2006 at 01:04:56PM +0100, Clemens Ladisch wrote: > Asbj?rn S?b? wrote: > > When playing back audio on an Edirol UA-25 usb sound device, I am > > getting "crackling" sound (not unlike playing an old LP). > > > > The system is an ASUS L5000-series laptop, > > Does the crackling still happen when you disable anything ACPI and PM- > related in the BIOS (if that is possible at all)?
Not much to do there, the only thing that I could do was to disable "LCD auto Power Saving". And that did not seem to have any effect on the crackling. Can one disable ACPI/PM by module unloading? John Haxby suggested offlist that I could try to unload the ehci_hcd module, as ehci support in 2.6.14 might have problems. I am not quite sure yet whether that helped or not, though. The difference, if any, seemed small. However, by sheer coincindence, I have discovered something I find quite strange. When I am compiling the kernel (as root), there is far less crakling, sometimes no crackling at all for longer periods. But the moment the compilation finishes, the crackling returns. A "find /" seems to have much of the same effect, although it does not suppress the crackling quite as well. I am not sure whether it is cpu load, disk load or "screen output load" that causes this, but the effect is very clear, the crackling is much reduced under load. Asbjørn ------------------------------------------------------- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnk&kid0944&bid$1720&dat1642 _______________________________________________ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
