[Bug 31887] Re: Cannot Enable DMA on Hard Drives after upgrade to Dapper Drake

[Alan Jenkins]

"Me too", running dapper with no outstanding updates as of this moment,
on all my drives (hd[a-c]) DMA is disabled and cannot be disabled as
above, and:

I'm currently running the latest /breezy/ kernel, 2.6.12-9-k7, (due to
other regressions which I have yet to resolve).  Could this be a
userspace triggered problem??

It seems a generic IDE driver is being used (/proc/ide/ide0/model is
"generic"); the chipset is a SiS 5513.

Aha!  I didn't know ubuntu compiled IDE as a kernel module, but thats
what /boot/config-2.6.12-9-k7 says.  Presumably this is included in the
initrd.  So it looks like my problem is that the module for my specific
chipset (sis5513.ko), which would support DMA on it, doesn't get loaded
(or is available too late).

Kernel messages don't seem very helpful.

4294672.239000] Probing IDE interface ide0...
[4294672.623000] hda: WDC WD1200BB-00DWA0, ATA DISK drive
[4294673.031000] hdb: SAMSUNG SCR-2430, ATAPI CD/DVD-ROM drive
[4294673.082000] Probing IDE interface ide1...
[4294673.873000] hdc: LITE-ON COMBO SOHC-5232K, ATAPI CD/DVD-ROM drive
[4294674.485000] Probing IDE interface ide2...
[4294674.997000] Probing IDE interface ide3...
[4294675.509000] Probing IDE interface ide4...
[4294676.021000] Probing IDE interface ide5...
[4294676.533000] ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
[4294676.533000] ide1 at 0x170-0x177,0x376 on irq 15
[4294676.550000] hdb: ATAPI 20X CD-ROM drive, 0kB Cache
[4294676.550000] Uniform CD-ROM driver Revision: 3.20
[4294676.557000] hdc: ATAPI 52X DVD-ROM CD-R/RW drive, 2048kB Cache
[4294676.561000] hda: max request size: 1024KiB
[4294676.617000] hda: 234441648 sectors (120034 MB) w/8192KiB Cache, CHS=16383/255/63
[4294676.621000] hda: cache flushes supported
[4294676.621000]  /dev/ide/host0/bus0/target0/lun0: p1 p2 p3 p4 < p5 p6 p7 p8 p9 >

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Cannot Enable DMA on Hard Drives after upgrade to Dapper Drake
https://launchpad.net/bugs/31887