Red Hat Bugzilla – Bug 450225
DMA is disabled on my laptop's DVD drive.
Last modified: 2008-06-06 05:40:50 EDT
Description of problem:
In short, DMA is not enabled on my laptop's DVD drive. The kernel explicitly
disables it on bootup, and as a result the whole system is jerky when the drive
is in use.
Version-Release number of selected component (if applicable):
Fedora 9, x86_64, kernel 220.127.116.11-18.fc9.x86_64.
Running on an Acer Ferrari 4000 laptop, ATI 200M chipset, using the pata_atiixp
driver. (Drive is PATA, not SATA) dmesg attached, but here is the relevant bit:
ACPI: PCI Interrupt 0000:00:14.1[A] -> GSI 16 (level, low) -> IRQ 16
scsi0 : pata_atiixp
scsi1 : pata_atiixp
ata1: PATA max UDMA/100 cmd 0x1f0 ctl 0x3f6 bmdma 0x8410 irq 14
ata2: PATA max UDMA/100 cmd 0x170 ctl 0x376 bmdma 0x8418 irq 15
ata1.00: ATA-6: TOSHIBA MK1032GAX, AB211A, max UDMA/100
ata1.00: 195371568 sectors, multi 16: LBA48
ata1.00: configured for UDMA/100
ata2.00: ATAPI: MATSHITADVD-RAM UJ-845S, D200, max UDMA/33
ata2.00: simplex DMA is claimed by other device, disabling DMA
ata2.00: configured for PIO4
The problem seems to be the same as these:
If I could force-enable this somehow that would be fine, but the fact that it
starts up wrong is a problem.
Created attachment 308500 [details]
dmesg with the problem.
*** This bug has been marked as a duplicate of 450191 ***