Hello, this is my first post to Linux-Kernel so I hope I get this right. On my Pentium 200 system with Intel i430VX chipset and PIIX3, my Maxtor 3.5GB IDE HD would always have DMA enabled even in 2.4.0-test10, but then sometime between 2.4.0-test12 and 2.4.0 (final), DMA was not being enabled anymore upon boot. Here is my relevant "dmesg" from 2.4.0-test10: Uniform Multi-Platform E-IDE driver Revision: 6.31 ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx PIIX3: IDE controller on PCI bus 00 dev 39 PIIX3: chipset revision 0 PIIX3: not 100% native mode: will probe irqs later ide0: BM-DMA at 0xf000-0xf007, BIOS settings: hda:pio, hdb:pio ide1: BM-DMA at 0xf008-0xf00f, BIOS settings: hdc:pio, hdd:pio hda: Maxtor 83500A4, ATA DISK drive hdb: ST31220A, ATA DISK drive hdc: ATAPI CDROM, ATAPI CDROM drive ide0 at 0x1f0-0x1f7,0x3f6 on irq 14 ide1 at 0x170-0x177,0x376 on irq 15 hda: 6839440 sectors (3502 MB) w/256KiB Cache, CHS=848/128/63, (U)DMA hdb: 2116296 sectors (1084 MB) w/256KiB Cache, CHS=524/64/63, DMA Notice the drive being picked up as (U)DMA, and the Seagate 1.2GB being picked up as DMA. Now look at my 2.4.0 dmesg: Uniform Multi-Platform E-IDE driver Revision: 6.31 ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx PIIX3: IDE controller on PCI bus 00 dev 39 PIIX3: chipset revision 0 PIIX3: not 100% native mode: will probe irqs later ide0: BM-DMA at 0xf000-0xf007, BIOS settings: hda:pio, hdb:pio ide1: BM-DMA at 0xf008-0xf00f, BIOS settings: hdc:pio, hdd:pio hda: Maxtor 83500A4, ATA DISK drive hdb: ST31220A, ATA DISK drive hdc: ATAPI CDROM, ATAPI CDROM drive ide0 at 0x1f0-0x1f7,0x3f6 on irq 14 ide1 at 0x170-0x177,0x376 on irq 15 hda: 6839440 sectors (3502 MB) w/256KiB Cache, CHS=848/128/63 hdb: 2116296 sectors (1084 MB) w/256KiB Cache, CHS=524/64/63, DMA Here you can see that DMA is still configured, because the Seagate retains DMA. But for some reason the Maxtor is now getting no DMA at all. I can use "hdparm" to enable it manually and I did an "updatedb" to generate some heavy test disk activity, and it worked fine. So I cannot assume that DMA is being disabled on my Maxtor on purpose, because of some bad hardware or something, and I am guessing something changed in the IDE driver recently that buggered the DMA enabling. Please CC all correspondence to my email, since I don't subscribe to Linux-Kernel. Thanks! xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx Josh Straub ô¿ô [EMAIL PROTECTED] - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/