HDIO_SET_DMA failed on a Dell Latitude C400 Laptop
From: Mark Watts (m.watts_at_eris.qinetiq.com)
To: email@example.com Date: Mon, 12 Jul 2004 14:07:14 +0100
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I've just burnt a cd for the first time on a Dell Latitude C400 laptop and I
noticed that the system was quite sluggish while the burn was happening.
(mouse pointer erratic, window redraw slow etc).
Remembering a similar issue with a desktop system, I did the following to
enable DMA on the hard drive (hdparm was giving ~3MB/sec read)
# hdparm -c1 -d1 /dev/hda
setting 32-bit IO_support flag to 1
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Operation not permitted
IO_support = 1 (32-bit)
using_dma = 0 (off)
hdparm now reports ~7MB/sec which is better but still prety poor.
Any ideas why I couldn't set DMA on the drive?
CPU = Mobile Pentum 3 @1.2GHz (800MHz when booted with no power cord)
Ram = 256MB
HDD = IBM Travelstar (IC25N020ATDA04-0) 20GB
BIOS Rev = A12
Senior Systems Engineer
QinetiQ Trusted Information Management
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