DMA not enabled for IDE disks

Just to make sure I don't get things confused - you have a SATA motherboard, but your hard drive is still connected via traidtional IDE, right?

And can you attach the output of the lspci command, please?

Ben - at a guess it's this patch: http://bugzilla.kernel.org/attachment.cgi?id=8646&action=view . Mind including it? Looks like it should be safe.

Patch added for next dapper update. Will be included in edgy too.

Probably no longer relevant, but here's the requested info.

Yes, my MB supports both SATA and PATA but I'm using only PATA disks (what I had before).

Just to make sure we get this right, can you add the output of "lspci -n" as well?

Thanks

I just received a new kernel update, 2.6.17-6-686, but the problem remains:

[17179572.928000] VP_IDE: Unknown VIA SouthBridge, disabling DMA.

I compiled my own kernel, with apt-get install linux-source-2.6.17 and some other commands, while applying the patch. Looks like the -6 kernel in ubuntu edgy didn't include the patch, and looks like the patch fixes my problem completely (hdparm -tT goes from 3 to 25 MB/s).

Are you sure the patch was included in the ubuntu kernel tree?

With the patched kernel, i'm getting a couple of error messages during boot, though everything appears to be working fine:

[17179609.028000] hda: dma_timer_expiry: dma status == 0x60
[17179609.028000] hda: DMA timeout retry
[17179609.028000] hda: timeout waiting for DMA
[17179609.240000] hda: status error: status=0x58 { DriveReady SeekComplete DataR
equest }
[17179609.240000] ide: failed opcode was: unknown
[17179609.240000] hda: drive not ready for command
--
[17179609.528000] hda: set_drive_speed_status: status=0x58 { DriveReady SeekComp
lete DataRequest }
[17179609.528000] ide: failed opcode was: unknown
[17179629.512000] hda: dma_timer_expiry: dma status == 0x60
[17179629.512000] hda: DMA timeout retry
[17179629.512000] hda: timeout waiting for DMA

It's fix committed, so it's in the repo, just not uploaded yet.

Just a heads up: the DMA problem resurfaced in the 2.6.19 kernels in feisty.

It is strange because the patch indicated in comment 4 is already applied to the the 2.6.19 source tree (I checked). Also there is no "disabling DMA" message like before. However, the fact is that DMA is turned off, and hdparm doesn't allow me to turn it on.

OK, maybe I was confused, but it seems 2.6.19-7 is not detecting my hard drive as IDE, it is mapping it as a scsi drive, /dev/sda. And although hdparm -d doesn't work with scsi devices I can notice that DMA is indeed enabled.

So nevermind my last comment.

This report was marked 'Fix Committed' a while ago and there hasn't been any activity in it recently. I'm going to go ahead and mark the status as 'Fix Released'. If this is not the case, please retest against the latest Hardy Alpha release and report back your results. Thanks in advance.