Bug 450191 - DMA mode disabled for DVD drive, reverts to PIO4
DMA mode disabled for DVD drive, reverts to PIO4
Product: Fedora
Classification: Fedora
Component: kernel (Show other bugs)
All Linux
low Severity low
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Assigned To: Alan Cox
Fedora Extras Quality Assurance
: Reopened
: 450225 (view as bug list)
Depends On:
  Show dependency treegraph
Reported: 2008-06-05 15:36 EDT by James Ettle
Modified: 2008-06-12 22:27 EDT (History)
2 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2008-06-12 22:27:23 EDT
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Regression: ---
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Documentation: ---
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RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
dmesg output with the problem (25.08 KB, text/plain)
2008-06-05 15:36 EDT, James Ettle
no flags Details

  None (edit)
Description James Ettle 2008-06-05 15:36:05 EDT
Description of problem:
The kernel is disabling DMA for the DVD drive on my HP zx5030EA (ATI IXP-based)
notebook, making transfers very slow. I've never seen this problem in previous
releases of Fedora.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. Boot.

Actual results:
The following is seen in dmesg:

ata1: PATA max UDMA/100 cmd 0x1f0 ctl 0x3f6 bmdma 0x8060 irq 14
ata2: PATA max UDMA/100 cmd 0x170 ctl 0x376 bmdma 0x8068 irq 15
ata1.00: ATA-6: IC25N060ATMR04-0, MO3OAD0A, max UDMA/100
ata1.00: 117210240 sectors, multi 16: LBA48 
ata1.00: configured for UDMA/100
ata2.00: ATAPI: HL-DT-STCD-RW/DVD DRIVE GCC-4241N, 0C29, max MWDMA2
ata2.00: simplex DMA is claimed by other device, disabling DMA
ata2.00: configured for PIO4

Very slow DVD drive.

Expected results:
Multi-word DMA available for the DVD drive.
Comment 1 James Ettle 2008-06-05 15:36:05 EDT
Created attachment 308479 [details]
dmesg output with the problem
Comment 2 Alan Cox 2008-06-05 16:48:41 EDT
Fixed upstream already.
Comment 3 James Ettle 2008-06-05 17:23:04 EDT
Any idea when the fix will filter its way down into F9/what should I look out
for on Koji?
Comment 4 Dave Jones 2008-06-05 17:27:25 EDT
alan, do you have the git hash or a pointer to the patch? we can throw this into
f9 as an update until .26 lands.
Comment 5 Chuck Ebbert 2008-06-05 20:28:55 EDT
Fixed in
Comment 6 Alan Cox 2008-06-06 05:11:49 EDT
(The real fix is mostly not to load pata_acpi in the wrong order)
Comment 7 Chuck Ebbert 2008-06-06 05:40:51 EDT
*** Bug 450225 has been marked as a duplicate of this bug. ***
Comment 8 Solomon Peachy 2008-06-07 08:40:41 EDT
Glad to hear a fix is in and will filter down the intertubes soon-ish. 
Meanwhile, Blacklisting pata_acpi seems to have done the trick for my laptop.
Comment 9 James Ettle 2008-06-07 13:38:25 EDT
Confirmed fixed in kernel-, closing.
Comment 10 Chuck Ebbert 2008-06-09 23:15:22 EDT
Bug will be closed automatically when a new kernel gets released.
Comment 11 Fedora Update System 2008-06-11 21:38:36 EDT
kernel- has been submitted as an update for Fedora 9
Comment 12 Fedora Update System 2008-06-12 22:26:55 EDT
kernel- has been pushed to the Fedora 9 stable repository.  If problems still persist, please make note of it in this bug report.

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