I own an Acer Aspire 162LM Laptop that suffer of this same bug.
Frequently, when I make a high I/O use of the disk I see that the system
Freeze fore some seconds and in the dmesg I see:
[59509.084000] hda: dma_timer_expiry: dma status == 0x21
[59519.084000] hda: DMA timeout error
[59519.084000] hda: dma timeout error: status=0xd0 { Busy }
[59519.084000] ide: failed opcode was: unknown
[59519.084000] hda: DMA disabled
[59519.132000] ide0: reset: success
and the system return to works ok.
I have a
[ 16.977963] VP_IDE: IDE controller at PCI slot 0000:00:11.1
[ 16.978054] ACPI: Unable to derive IRQ for device 0000:00:11.1
[ 16.978057] ACPI: PCI Interrupt 0000:00:11.1[A]: no GSI
[ 16.978067] VP_IDE: chipset revision 6
[ 16.978069] VP_IDE: not 100% native mode: will probe irqs later
[ 16.978081] VP_IDE: VIA vt8235 (rev 00) IDE UDMA133 controller on
pci0000:00:11.1
[ 16.978089] ide0: BM-DMA at 0x1c60-0x1c67, BIOS settings: hda:DMA,
hdb:pio
[ 16.978101] ide1: BM-DMA at 0x1c68-0x1c6f, BIOS settings: hdc:DMA,
hdd:pio
[ 16.978108] Probing IDE interface ide0...
[ 17.396066] hda: IC25N040ATMR04-0, ATA DISK drive
[ 17.931617] ieee1394: Host added: ID:BUS[0-00:1023] GUID[000ae4045210430c]
[ 18.067738] ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
and Ubuntu 7.04 Feisty Fawn.
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DMA timeouts on UDMA harddisks
https://bugs.launchpad.net/bugs/25975
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