[MPlayer-users] Not able to turn on DMA for DVD drive in RHL8.0

Jooil Lee jooil.lee at its.uq.edu.au
Thu Mar 6 06:18:22 CET 2003

If you are using RH8, then you have to do something on modules.conf file 
under /etc. (something like ide-dma = 1)

Please search on this mailing list you will find the answer. Also check 
the RH 8 release note. I think RH people mentioned about this issue in 

softrade wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> ------------------------------------------------------------------------
> Have swapped the Video Card with the ones mentioned in the Mplayer DOCS as OK
> but I have not noticed a huge change in performance.
> The system works well under Windows running software Cinemaster and PowerDVD. I
> would expect that the open source model would be heaps better since so many
> users have contributed feedback.
> I also suspected the crappy sound card and also changed that. I even changed to
> a completely different Motherboard and CPU (AOPEN & PIII 800 MHZ CPU) Yes this
> was a faster result but still not as good as under Windows Software Cinmaster
> on the PII400. I noticed that the drive led under windows was continiously
> flashing but under Linux it was noticably slower. The only difference that
> stands out is the DMA enable. If I turn of the DMA to the DVD-ROM in Windows
> the led flashes and about the same rate as the current config in linux. Why
> can't I turn DMA on is the question? Why does hdparm tell me the operation not
> permitted?
> Michael Osten wrote:
>>[Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
>>On Wed, 2003-03-05 at 21:03, softrade wrote:
>>>[Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
>>>Have just installed Mplayer on my PII400 box. I have an Intel SE440
>>>Motherboard and a 740Intel AGP Card. The performance is slow and I
>>>believe it is because I can not invoke the DMA on with either the hdparm
>>>-d1 command or echo command or by creating a harddisk file in the
>>>/etc/sysconfig directory.
>>>hdparm gives the reply operation not permitted. I know the drive &
>>>chipset is DMA capible as it runs software cinemaster and powerdvd OK
>>>under Windows 98 with DMA activated and is about the same speed as
>>>Mplayer is without the dvd rom in non DMA mode.
>>>Has anyone had this problem and how did you fix it?? I have read
>>>mountains of docs and have run out of ideas.
>>man hdparm
>>-d     Disable/enable the "using_dma" flag for this drive.
>>              This option only works with a few  combinations  of
>>              drives  and  interfaces which support DMA and which
>>              are known to the IDE driver (and with all supported
>>              XT  interfaces).   In  particular, the Intel Triton
>>              chipset is supported for bus-mastered DMA operation
>>              with many drives (experimental).  It is also a good
>>              idea to use the -X34 option in combination with -d1
>>              to  ensure  that the drive itself is programmed for
>>              multiword DMA mode2.  Using DMA does not  necessar­
>>              ily provide any improvement in throughput or system
>>              performance, but many  folks  swear  by  it.   Your
>>              mileage may vary.
>>Its just a guess, but I'd place blame on that crappy video card.
>>RTFM!!!  http://www.MPlayerHQ.hu/DOCS
>>Search:  http://www.MPlayerHQ.hu/cgi-bin/htsearch
>>RTFM!!!  http://www.MPlayerHQ.hu/DOCS
>>Search:  http://www.MPlayerHQ.hu/cgi-bin/htsearch


Jooil Lee                       Telephone: (07) 3365 4408
jooil.lee at its.uq.edu.au
Information Technology Services
The University of Queensland
Brisbane Queensland 4072 AUSTRALIA

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