On Thu, Mar 08, 2001 at 03:03:53PM +0100, Christoph Groth wrote: > Hello all, > > My box is a PC with an EPoX 8KTA2 and a Duron 700, a Matrox Millennium > II PCI and a Gravius Ultrasound PnP (ISA). It is running Debian 2.2r2 > (Kernel 2.2.17). > > The IDE-Devices connected to it are: > hda: Traxdata CDRW2260+, ATAPI CDROM drive > hdb: TOSHIBA CD-ROM XM-6002B, ATAPI CDROM drive > hdc: IBM-DTLA-307030, ATA DISK drive > hdd: SAMSUNG WU32163A (2.16GB), ATA DISK drive You have a rather strange drive configuration. I'd normally put the hard drives on the primary IDE interface, and load my CD-ROM's on the second. I guess it really doesn't matter, but it's just common practice. Also, if I'm reading it correctly, you have a nice, fast IBM 30GB drive paired with an old, slow Samsung 2GB drive. I'd dump the Samsung like a bad habit. It's probably slowing down your entire IDE channel everytime you access it. > I am quite happy with this machine except for one thing: > > Whenever the CD-drives are accessed in some way (reading, burning) at > least two strange effects happen: > > 1) Sound played at 44kHz becomes noisy and literally slows down. > Sound played at 22kHz or less isn't affected. > > 2) When connected to an ISP with the 56k external serial modem, > massive communication problems appear. E.g. ping doesn't work (it > simply ceases to produce any output). As soon as the CD-ROM access > stops, everything works again. Have you tried removing the CD Audio cable? I doubt it will make a difference, but it's one more thing out of the equation. Have you tried using your drives seperatly? Boot up the system with only one CD attached and see what happens, then try it with the other. Also, it seems as though you may be experiencing some electrical noise problems, since both of these problems deal with very sensitive frequencies. Have you tried another power supply? > Maybe changing the PIO-/DMA-Mode could help, but I don't know how to > set them for CD-ROM drives (hdparm is only for HDDs). You can usually set your drives for PIO mode in the BIOS, or at the very least turn off bus-mastering for that channel. I know I'm just offering stabs in the dark here, but it's a very strange problem. I don't know what tools, extra parts, or knowledge you have at your disposal, but I'd do a part-by-part swap out until the I found the problem. I'd also try it under another OS on a spare hard drive. Good luck! Steven -- Steven Dickenson <steven@usermail.com>
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