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Date: Fri, 16 Jul 2004 15:50:03 -0700
From: Nate Lawson <nate@root.org>
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Subject: ATA DVD playback hanging in physrd
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While playing back a DVD on my Thinkpad, it hangs at some point (2-5 minutes
after beginning playback).  The player is hung in "physrd" and the drive stops
spinning.  This hang happens when the drive is in PIO4 or DMA mode.

However, starting another process (i.e. cat /dev/acd0) spins up the drive and
it works (and the other process begins running again).  What's interesting is 
that I can quickly trigger this hang by starting IO on a completely different 
channel (i.e. dd if=/dev/ad0 of=/dev/null bs=1m).  This indicates that it may 
be a driver issue since the DVD drive that hangs is on a different channel and 
irq than the hard drive.

Devices:
atapci0: <Intel ICH3 UDMA100 controller> port
0x1860-0x186f,0x376,0x170-0x177,0x3f6,0x1f0-0x1f7 at device 31.1 on pci0
ata0: at 0x1f0 irq 14 on atapci0
ata1: at 0x170 irq 15 on atapci0
[...]
ad0: 19077MB <IC25N020ATMR04-0> [41344/15/63] at ata0-master UDMA100
ata1-master: FAILURE - ATAPI_RESET no interrupt
acd0: DVDROM <MATSHITADVD-ROM SR-8175> at ata1-master PIO4

The same behavior also happens on my DVD/CDRW drive.
ata1-slave: FAILURE - ATAPI_IDENTIFY no interrupt
ata1-slave: FAILURE - ATAPI_IDENTIFY no interrupt
ata1-master: FAILURE - ATAPI_RESET no interrupt
acd0: CDRW <UJDA720 DVD/CDRW> at ata1-master PIO4

-Nate