DMA issues w/ DVD/CD

I've been experiencing choppy playback of my DVDs, and I looked around, and noticed that I do not have DMA enabled for my combo drive. I've looked around in all the places I could, and tried all the fixes I could, and none of them work, hoping I'll find another suggestion here. Here's some output.
dmesg log:
ata1.00: ATA-6: TOSHIBA MK8025GAS, KA023A, max UDMA/100
ata1.00: 156301488 sectors, multi 16: LBA
ata1.00: configured for UDMA/100
ata2.00: ATAPI: TOSHIBA DVD-ROM SD-R2212, 1913, max MWDMA2
ata2.00: WARNING: ATAPI DMA disabled for reliablity issues. It can be enabled
ata2.00: WARNING: via pata_ali.atapi_dma modparam or corresponding sysfs node.
ata2.00: simplex DMA is claimed by other device, disabling DMA
ata2.00: configured for PIO4
dmesg | grep DMA
DMA 0x00000000 -> 0x00001000
DMA zone: 3967 pages, LIFO batch:0
pci 0000:00:07.0: Activating ISA DMA hang workarounds
ata1: PATA max UDMA/100 cmd 0x1f0 ctl 0x3f6 bmdma 0x2040 irq 14
ata2: PATA max UDMA/100 cmd 0x170 ctl 0x376 bmdma 0x2048 irq 15
ata1.00: ATA-6: TOSHIBA MK8025GAS, KA023A, max UDMA/100
ata1.00: configured for UDMA/100
ata2.00: ATAPI: TOSHIBA DVD-ROM SD-R2212, 1913, max MWDMA2
ata2.00: WARNING: ATAPI DMA disabled for reliablity issues. It can be enabled
ata2.00: simplex DMA is claimed by other device, disabling DMA
parport0: PC-style at 0x378 (0x778), irq 7, dma 0 [PCSPP,TRISTATE,COMPAT,ECP,DMA]
hdparm -i /dev/sr0
/dev/sr0:
Model=TOSHIBA DVD-ROM SD-R2212 , FwRev=1913 , SerialNo=928A710011
Config={ Fixed Removeable DTR<=5Mbs DTR>10Mbs nonMagnetic }
RawCHS=0/0/0, TrkSize=0, SectSize=0, ECCbytes=0
BuffType=unknown, BuffSize=2048kB, MaxMultSect=0
(maybe): CurCHS=0/0/0, CurSects=0, LBA=yes, LBAsects=0
IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: sdma0 sdma1 sdma2 mdma0 mdma1 *mdma2
AdvancedPM=no
Drive conforms to: ATA/ATAPI-5 T13 1321D revision 3: ATA/ATAPI-2,3,4,5
* signifies the current active mode
Running the 2.6.27-ARCH kernel
Here's my lsmod as well:
Module Size Used by
ipv6 260260 12
radeon 144544 2
drm 74280 3 radeon
joydev 11584 0
irtty_sir 7040 0
sir_dev 13316 1 irtty_sir
irda 112568 1 sir_dev
crc_ccitt 3840 1 irda
ppdev 9348 0
lp 11108 0
pcmcia 35116 0
snd_pcsp 11040 0
psmouse 38288 0
parport_pc 36804 1
parport 33004 3 ppdev,lp,parport_pc
serio_raw 7172 0
i2c_ali15x3 8452 0
i2c_ali1535 7940 0
container 5248 0
i2c_core 22420 2 i2c_ali15x3,i2c_ali1535
video 18064 0
output 4608 1 video
ohci1394 30256 0
sg 28852 0
ieee1394 80452 1 ohci1394
ehci_hcd 35852 0
uhci_hcd 24080 0
yenta_socket 25228 1
rsrc_nonstatic 12672 1 yenta_socket
pcmcia_core 33812 3 pcmcia,yenta_socket,rsrc_nonstatic
alim1535_wdt 6552 0
shpchp 31252 0
pci_hotplug 28324 1 shpchp
ati_agp 8716 1
agpgart 30804 2 drm,ati_agp
processor 34732 1
evdev 11296 5
ndiswrapper 188828 0
usbcore 134128 4 ehci_hcd,uhci_hcd,ndiswrapper
fan 6148 0
button 7824 0
ac 6020 0
battery 12036 0
snd_seq_oss 31872 0
snd_seq_midi_event 8192 1 snd_seq_oss
snd_seq 49968 4 snd_seq_oss,snd_seq_midi_event
snd_seq_device 8332 2 snd_seq_oss,snd_seq
snd_ali5451 20108 1
snd_ac97_codec 100516 1 snd_ali5451
snd_pcm_oss 40192 0
snd_pcm 69636 4 snd_pcsp,snd_ali5451,snd_ac97_codec,snd_pcm_oss
snd_timer 21384 2 snd_seq,snd_pcm
snd_page_alloc 9224 1 snd_pcm
snd_mixer_oss 16512 1 snd_pcm_oss
snd 50724 12 snd_pcsp,snd_seq_oss,snd_seq,snd_seq_device,snd_ali5451,snd_ac97_codec,snd_pcm_oss,snd_pcm,snd_timer,snd_mixer_oss
soundcore 8160 1 snd
ac97_bus 3584 1 snd_ac97_codec
natsemi 28256 0
rtc_cmos 11424 0
rtc_core 17564 1 rtc_cmos
rtc_lib 4480 1 rtc_core
ext3 126472 1
jbd 46100 1 ext3
mbcache 8708 1 ext3
sr_mod 16708 0
cdrom 35360 1 sr_mod
sd_mod 27160 3
ata_generic 6788 0
pata_ali 10244 2
pata_acpi 6016 0
libata 152992 3 ata_generic,pata_ali,pata_acpi
scsi_mod 96460 4 sg,sr_mod,sd_mod,libata
dock 9488 1 libata
Any help would be appreciated, thanks!

Unfortunately the solution by GerBra doesn't work for me.
With 2.6.32 kernel, blacklisting pata_acpi from kernel boot options in grub and from rc.conf produced this messages at boot:
22:ata1.01: ATAPI: HL-DT-ST DVDRAM GSA-4167B, DL10, max UDMA/33
423:ata1.01: WARNING: ATAPI DMA disabled for reliability issues. It can be enabled
424:ata1.01: WARNING: via pata_ali.atapi_dma modparam or corresponding sysfs node.
425:ata1.01: configured for UDMA/33
Even hdparm reported:
/dev/sr0:
Model=HL-DT-ST DVDRAM GSA-4167B, FwRev=DL10, SerialNo=19A2B5AFE5D8
Config={ Fixed Removeable DTR<=5Mbs DTR>10Mbs nonMagnetic }
RawCHS=0/0/0, TrkSize=0, SectSize=0, ECCbytes=0
BuffType=unknown, BuffSize=unknown, MaxMultSect=0
(maybe): CurCHS=0/0/0, CurSects=0, LBA=yes, LBAsects=0
IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio3 pio4
DMA modes: mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 *udma2
AdvancedPM=no
Drive conforms to: Unspecified: ATA/ATAPI-2,3,4,5
* signifies the current active mode
It seems that dma is active, but a simple:
dd if=/dev/sr0 of=/dev/null
...produce a 100% cpu usage reported by htop.
Instead, issuing:
echo 1 > /sys/module/pata_ali/parameters/atapi_dma
Seems to correct all the issues, except that the system sometimes hangs at boot if i put that command in rc.local(!)
putting:
options pata_ali atapi_dma=1
in /etc/modprobe.d/modprobe.conf (as kernel messages suggest) has no effect on arch linux because that module is loaded in initrd.
So, (at least for me) it is necessary to edit /etc/mkinitcpio.conf and change/add to the FILES array:/etc/modprobe.d/modprobe.conf
Eg:
FILES= ' to ' FILES="/etc/modprobe.d/modprobe.conf"
Next, something like
echo "options pata_ali atapi_dma=1" >> /etc/modprobe.d/modprobe.conf
and finally:
mkinitcpio -p kernel26
reboot
Last edited by kokoko3k (2010-01-18 14:33:36)

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