Paul Davis wrote: > On Tue, 2005-08-16 at 13:34 +0100, Jon Stutters wrote: > >>Hi all, >> >>I'm trying to get an Echo Indigo IO working under Gentoo 2.6.12 kernel. >> The card's recognized correctly by ALSA and I can play through it but >>all output is badly distorted. >> >>I had the same problem on this laptop under Windows and fixed it using a >>utility from Echo to disable prefetch for the cardbus chipset (ENE >>CB1410). Does anyone know how to disable prefetch under Linux? I've >>had a go at hacking the cardbus driver source but I've not got the right >>result yet. > > i would have thought that this was susceptible to the same kind of > solution that Ico used to solve a similar problem with the RME HDSP > pcmcia card. rather than hack the driver, use setpci and its cousins to > investigate and modify the state of the PCI device registers. you will > need to find out how to get the state in windows before and after that > utility runs, and then take the information on what it changed and apply > it to setpci. You're a lifesaver Paul thanks very much. For the record: To disable prefetch on the ENE CB1410 and fix playback with the Echo Indigo IO change C8h to 0200h. For example: setpci -s 02:04.0 c8.W=2,0 (where 02:04.0 is the cardbus controller address) Cheers, Jon Stutters
