Re: [gentoo-user] setting "using_dma" on a BenQ DVD/RW drive

[Joseph <syscon@interbaun.com>]

I'm starting to believe that it has something to do with some option in
the kernel that is not enabled.
I just swap the CD/RW Plextor from the machine that is working OK on
kernel 2.6.11 (where DMA is enabled and everything is working, CD/RW,
except eject - but that is another story) into a new New Machine on
kernel-2.6.12

Anyhow, I just put the Plextor CD/RW into my new machine and the DMA was
not not enabled: hdparm /dev/hdc for plextor on working machine.
/dev/hdc:
 IO_support   =  1 (32-bit)
 unmaskirq    =  1 (on)
 using_dma    =  1 (on)
 keepsettings =  0 (off)
 readonly     =  0 (off)
 readahead    = 256 (on)

hdparm for plextor on new machine:

/dev/hdd:
 IO_support   =  0 (16-bit)
 unmaskirq    =  0 (off)
 using_dma    =  0 (off)
 keepsettings =  0 (off)
 readonly     =  0 (off)
 readahead    = 256 (on)

So, I strongly believe it has to do with some setting in the kernel or
diver.  

Another interesting thing is that lshw is not even listing CDROM present
in a new machine for both drives: BenQ and Plextor, even though kernel
detects them correctly.
I did not put BenQ Writer into working machine, I'll try to analyze both
kernel settings first, to see what I'm missing.

-- 
#Joseph
 
> > This makes it more likely that the problem is lack of support for your
> > IDE chipset in your kernel.
> 
> Joseph,
> 
> Please post *ALL* of the output of a dmesg and lspci-v command.
> I too believe chipset issues are most likely the problem.
> 
> I am at present fighting a similar problem with a 915GM.
> 
> -- 
> Regards,
> Ray
> 
> 
> 

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