[ltp] How does /proc/acpi/ibm/bay work

[Tony Whitmore]

Nils wrote:
> This is really interesting, which kernel version do you use ?

2.6.10, self-compiled. (The VMWare modules don't compile under 2.6.11.x.)

> I boot my thinkpad with an ultrabay battery and then I try to use a dvd-rom, 
> but I have no success with enabling dma.
> Can you try to boot your thinkpad without the DVD-RW drive and then after 
> inserting the DVD-RW drive try to enable dma ?
> (you can also boot with a second battery, but not everybody has this 
> possibility)

As I mentioned, I can't use a different device from the one I booted 
with. So if I boot with a battery, I can't use the DVD-ROM/CD-RW drive. 
If I boot with the CD-RW/DVD-ROM drive inserted, I can't use the battery 
(although the BIOS may still be using it.) So, as I can't use it, I 
can't enable DMA when the drive wasn't inserted during boot.

What I *can* do is boot with the drive in, disable DMA, remove the 
drive, re-insert it, enable DMA and have hdparm report DMA enabled.

HTH,

Tony