DMA-aware drive runs at PIO since upgrading to 5.3beta

Alexander Portnoy my-subs at
Thu Sep 9 06:55:58 PDT 2004

On Thu, 09 Sep 2004 06:47:58 +0200
Mark Daniel Reidel <changethis at> wrote:

> Hi there!
> Since I upgraded from a current as of end of July to 5.3 beta2, I noticed, 
> that by CDRW now runs on PIO4 which is quite annoying, since it was running 
> on WDMA perfectly well before :o( My other drive, a DVD is detected fine, 
> here's the dmesg snip:
> ata0-slave: pio=0x0c wdma=0x22 udma=0x42 cable=40pin
> ATAPI_RESET time = 40us
> ata0-master: pio=0x0c wdma=0x22 udma=0xffffffff cable=40pin
> ATAPI_RESET time = 10us
> ata0-master: setting PIO4 on VIA 82C686B chip
> ata0-slave: setting PIO4 on VIA 82C686B chip
> ata0-slave: setting UDMA33 on VIA 82C686B chip
> acd0: <PLEXTOR CD-R PX-W5224A/1.02> CDRW drive at ata0 as master
> acd0: read 6890KB/s (6890KB/s) write 8958KB/s (8958KB/s), 2048KB buffer, PIO4
> acd0: Reads: CDR, CDRW, CDDA stream, packet
> acd0: Writes: CDR, CDRW, test write, burnproof
> acd0: Audio: play, 256 volume levels
> acd0: Mechanism: ejectable tray, unlocked
> acd0: Medium: CD-ROM unknown
> acd1: <Pioneer DVD-ROM ATAPIModel DVD-105S 0122/E1.22> DVDROM drive at ata0 
> as slave
> acd1: read 2750KB/s (6875KB/s), 512KB buffer, UDMA33
> acd1: Reads: CDR, CDRW, CDDA stream, DVDROM, DVDR, packet
> acd1: Writes:
> acd1: Audio: play, 256 volume levels
> acd1: Mechanism: ejectable tray, unlocked
> acd1: Medium: no/blank disc
> Any idea why it's doing this? My other PC at work has a CDROM which is also 
> now run on PIO4 instead of DMA since the upgrade, so I guess it's nothing 
> specific to my hardware since I have an Athlon and a P4 at work.
> Any help would be appreciated, because burning at PIO4 is not what I'd like 
> to to from now on as you can imagine ;o)
> 	- Mark

Mee too :-( Since I upgraded from 5.2.1 to 5.3-BETA3.
This happens also under FreeBSD-6.0-CURRENT (2004.

acd0: CDRW <HL-DT-STCD-RW/DVD DRIVE GCC-4241N/0C27> at ata1-master PIO4

hw.ata.atapi_dma: 1

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