On Sun, 27 Mar 2005, Eric Jahn wrote:
> Need a little troubleshooting/conceptual direction here: so I pop a
> video into my DVD player and it plays slightly choppy in both Xine and
> Totem. I make a copy with DVD backup and it plays back perfectly
> straight from the hard disk. Mmm-kay. So the first thing that comes to
> mind is DMA for my DVD drive isn't working. Sure enough, during DVD
> playback, when I watch the light for my hard disk, it is always
> flashing. Funny thing is, according to the following output, DMA is
> fully enabled and functioning. What gives?
> 64funky:/usr/src/linux# hdparm -d 1 /dev/hdc
>
> /dev/hdc:
> setting using_dma to 1 (on)
> HDIO_SET_DMA failed: Operation not permitted
> using_dma = 0 (off)
Yep, DMA's off and can't be turned on.
> cat /proc/pci:
> ...
> Bus 2, device 0, function 0:
> VGA compatible controller: ATI Technologies Inc RV280 [Radeon 9200 SE] (rev 1).
> IRQ 12.
> Master Capable. Latency=32. Min Gnt=8.
> Prefetchable 32 bit memory at 0xc0000000 [0xcfffffff].
> I/O at 0xc000 [0xc0ff].
> Non-prefetchable 32 bit memory at 0xd1000000 [0xd100ffff].
What about your IDE controller? Mine looks like this:
Bus 0, device 17, function 1:
IDE interface: VIA Technologies, Inc. VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 6).
Master Capable. Latency=32.
I/O at 0xa400 [0xa40f].
You need to have support for that controller available (compiled in if you
boot from IDE, although an initrd may remove that restriction). I have
this:
ATA/IDE/MFM/RLL support --->
<*> ATA/IDE/MFM/RLL support
IDE, ATA and ATAPI Block devices --->
<*> Enhanced IDE/MFM/RLL disk/cdrom/tape/floppy support
[*] PCI IDE chipset support
[*] Generic PCI bus-master DMA support
[*] Use PCI DMA by default when available
[*] ATA Work(s) In Progress (EXPERIMENTAL)
<*> VIA82CXXX chipset support
[snip]
> PIO modes: pio0 pio1 pio2 pio3 pio4
> DMA modes: mdma0 mdma1 mdma2
> UDMA modes: udma0 udma1 *udma2
> AdvancedPM=no
>
> * signifies the current active mode
Maybe that asterisk means that _if_ it uses UDMA, _then_ it uses udma2?
-- -eben ebQenW1@EtaRmpTabYayU.rIr.OcoPm home.tampabay.rr.com/hactar"You're one of those condescending Unix computer users!" "Here's a nickel, kid. Get yourself a better computer" - Dilbert.
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