Hi, 

I just rebooted with 2.4.19, and I find that there's no DMA on my ide
interface, and it is refusing to honour 'hdparm -d1 /dev/hda'. 

My system is an Asus P4B533 which uses an Intel 845e chipset (this
system has a 1.8GHz Northwood, 1G of memory).  I have BIOS version 1006
installed, which was the latest as of a few days ago (and the Asus site
seems dead right now). 

On boot, it says: 

...
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
ICH4: IDE controller on PCI bus 00 dev f9
PCI: Device 00:1f.1 not available because of resource collisions
ICH4: (ide_setup_pci_device:) Could not enable device.
hda: IBM-DTLA-307030, ATA DISK drive
hdb: WDC WD400AW-00BYK0, ATA DISK drive
hdc: ATAPI 48X CDROM, ATAPI CD/DVD-ROM drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
hda: 60036480 sectors (30739 MB) w/1916KiB Cache, CHS=59560/16/63
hdb: 78165360 sectors (40021 MB) w/2048KiB Cache, CHS=4865/255/63
hdc: ATAPI 48X CD-ROM drive, 128kB Cache
Uniform CD-ROM driver Revision: 3.12
Partition check:
 /dev/ide/host0/bus0/target0/lun0: p1 p2 p3 p4 < p5 p6 p7 p8 p9 >
 /dev/ide/host0/bus0/target1/lun0: p1 p2
...
lspci says for the IDE device: 

00:1f.1 IDE interface: Intel Corp. 82801DB IDE U100 (rev 01) (prog-if 8a [Master SecP PriP])
	Subsystem: Asustek Computer, Inc.: Unknown device 8089
	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-
	Latency: 0
	Interrupt: pin A routed to IRQ 10
	Region 0: I/O ports at <unassigned> [size=8]
	Region 1: I/O ports at <unassigned> [size=4]
	Region 2: I/O ports at <unassigned> [size=8]
	Region 3: I/O ports at <unassigned> [size=4]
	Region 4: I/O ports at f000 [size=16]
	Region 5: Memory at 40000000 (32-bit, non-prefetchable) [size=1K]
I'm not sure what the "Resource collisions" actually refer to, but I'm
guessing its the unassigned IO ports.  I tried switching "PnP OS" on and
off in the BIOS settings; it makes no difference. 

Full boot messages, lspci, /proc/iomem, /proc/interrupts and /proc/pci
output attached. 

Update: 2.4.19-ac1 seems to work fine, so I hope this part of -ac gets
merged into mainline soon... (Is it just the changes in the IDE driver,
or is it something to do with PCI setup?)

Thanks, 
    J