hdparm problem

floam · Posted: Mon Nov 04, 2002 3:36 am Post subject: hdparm problem

Ever sense ive upgraded to 2.4.19, hdparm wont work and I cant do ultra dma.

bash-2.05a# hdparm -d1 /dev/hda

/dev/hda:
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Operation not permitted
using_dma = 0 (off)

I tried it with the ac-sources and it worked, but then I coudlnt do the preemption and low latency stuffs.

anyone got it working in 2.4.19? running via kt400.

phong · Posted: Mon Nov 04, 2002 3:42 am Post subject:

It's actually a known compatability problem between the 2.4.19 kernel and your chipset (though some are calling it a bios bug, so maybe a bios update will help too.) The current workaround is to either use older gentoo-sources (2.4.19-gentoo-r7 should work) or use the ac-sources. Since it's a known problem that's fixed in the ac-sources, I'd imagine it'll be fixed when 2.4.20 comes out.
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floam · Posted: Mon Nov 04, 2002 3:46 am Post subject:

well im using the ac sources now, and it works. just one question: where can I get preemption and low latency patches for the 2.4.20 pres or whatever