On Wed, 27 Jan 2010, Alexander Best wrote:
i believe the sound you hear is due to the emergency unload sequence. i'm not
100% sure, but i think after applying the patch the sound is gone. i recently
replaced my old IDE hdd (which made a very loud "click!" during shutdown) with
a new SATA hdd. the new one is very quiet and so it's not that easy to
recognise any changes in the spin down procedure.
would be very nice if you could try the patch on one of the notebooks you're
referring to in order to see if the patch makes a difference.
Based on followups to this thread, here's the modified patch I've
tested:
--- sys/dev/ata/ata-disk.c.orig 2010-01-28 10:47:57.000000000 -0700
+++ sys/dev/ata/ata-disk.c 2010-01-28 11:49:32.000000000 -0700
@@ -191,6 +191,10 @@
{
struct ata_device *atadev = device_get_softc(dev);
+ if (atadev->param.support.command2 & ATA_SUPPORT_POWERMGT)
+ ata_controlcmd(dev, ATA_STANDBY_IMMEDIATE, 0, 0, 0);
+ return 0;
+
if (atadev->param.support.command2 & ATA_SUPPORT_FLUSHCACHE)
ata_controlcmd(dev, ATA_FLUSHCACHE, 0, 0, 0);
return 0;
This uses the POWERMGT bit and adds it before the existing code.
On a desktop system with an 80G drive, it's hard to tell if there's an
audible difference.
On an Acer notebook with a WD drive, it does change the sound.
Without the patch, the drive shutdown sounds like power has been pulled,
with a GLINK! head park followed by a decreasing-pitch spindown whir.
With the patch, there's a quieter glink with nearly no spindown whir.
Because this is subjective, I recorded the shutdown sounds with a
microphone underneath the notebook hard drive:
http://wonkity.com/~wblock/sounds/unpatchedglink.wav
http://wonkity.com/~wblock/sounds/patchedglink.wav
Can't speak to the safety of this, but it definitely sounds better.
-Warren Block * Rapid City, South Dakota USA
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