Public bug reported:
The error is continually reported to my log for unattached SATA link:
[ 396.840962] ata2: exception Emask 0x10 SAct 0x0 SErr 0x4040000 action 0xe
frozen
[ 396.840966] ata2: irq_stat 0x00000040, connection status changed
[ 396.840969] ata2: SError: { CommWake DevExch }
[ 396.840973] ata2: hard resetting link
[ 397.628026] ata2: SATA link down (SStatus 0 SControl 300)
[ 397.628033] ata2: EH complete
That renders some text modes (e.g. failsafe mode) and overfilled system
log unusable.
I have ASUS P5KC motherboard, which has 4 regular SATA ports (with 3
drives on them that work fine) and extra SATA port for RAID setup
(unused). It also has 1 PATA port for connecting CD/DVD drives. I
tracked down that the extra SATA port is causing the error and
apparently it is controlled by Jmicron eSATA/PATA controller, which also
controls PATA devices. I disabled the Jmicron controller in BIOS and
error disappeared, but I couldn't use my DVD drive - nor in Jaunty, nor
in Windows XP - it wasn't detected. So I tried setting the controller to
different modes in BIOS: IDE (default), AHCI and RAID; none helped.
I've stumbled on some posts relating it to NCQ and HotPlug support. NCQ
on my drives (which work fine) is off. I also tried booting with kernel
parameter libata.force=noncq to no avail.
So, can anyone help? Any advice on what I should try to make the error
go away (and keep my DVD drive operational)? Is it bug in Jmicron
firmware or Linux kernel / libsata?
ProblemType: Bug
Architecture: amd64
DistroRelease: Ubuntu 9.04
HibernationDevice: RESUME=UUID=8768e97b-03ee-44ab-9406-7e50b054812f
MachineType: System manufacturer P5KC
Package: linux-image-2.6.28-11-generic 2.6.28-11.42
ProcCmdLine: root=UUID=32caef82-51c0-481d-a73c-dc043aadb0bc libata.force=noncq
ro quiet splash
ProcEnviron:
LANGUAGE=
PATH=(custom, user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.28-11.42-generic
SourcePackage: linux
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug
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libata: Jmicron eSATA/PATA controller error
https://bugs.launchpad.net/bugs/377633
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