ATA DVD playback hanging in physrd

[Mayo]

On Fri, 2004-07-16 at 15:50, Nate Lawson wrote:
> 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

Similar issue has been mentioned few days ago in the "DVD/CD reading
issues with -CURRENT from 2004-06-27" thread. I have the same problem on
my workstation (LG DVD drive), though I don't have very current -CURRENT
at the moment.

Reseting the drive, as it was suggested in the thread, seems to help it.

mayo
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