Hi, I am having this issue on an Acer Aspire 1810TZ with a fresh 10.04
install (kernel version 2.6.32-19-generic #28-Ubuntu). Boot is very slow
and dmesg shows it is stuck after mounting the root partition with
messages as described in the original report.
...
[ 1.452734] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled,
doesn't support DPO or FUA
[ 1.452925] sda: sda1 sda2 sda3 sda4 < sda5 sda6 sda7 >
[ 1.516595] sd 0:0:0:0: [sda] Attached SCSI disk
[ 1.554650] usb 6-2: configuration #1 chosen from 1 choice
[ 1.772114] ata2: SATA link down (SStatus 0 SControl 300)
[ 2.108112] ata5: SATA link down (SStatus 0 SControl 300)
[ 2.444135] ata6: SATA link down (SStatus 0 SControl 300)
[ 3.272334] EXT4-fs (sda6): mounted filesystem with ordered data mode
[ 33.804129] ata1.00: exception Emask 0x0 SAct 0x1 SErr 0x0 action 0x6 frozen
[ 33.804136] ata1.00: failed command: READ FPDMA QUEUED
[ 33.804146] ata1.00: cmd 60/20:00:3e:7c:96/00:00:06:00:00/40 tag 0 ncq 16384
in
[ 33.804154] res 40/00:08:38:88:17/00:00:24:00:00/40 Emask 0x4
(timeout)
[ 33.804159] ata1.00: status: { DRDY }
[ 33.804166] ata1: hard resetting link
[ 34.288113] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[ 34.289656] ata1.00: ACPI cmd 00/00:00:00:00:00:a0 (NOP) rejected by device
(Stat=0x51 Err=0x04)
[ 34.289919] ata1.00: ACPI cmd ef/10:01:00:00:00:a0 (SET FEATURES) succeeded
[ 34.290167] ata1.00: ACPI cmd ef/10:02:00:00:00:a0 (SET FEATURES) succeeded
[ 34.290173] ata1.00: ACPI cmd ef/10:03:00:00:00:a0 (SET FEATURES) filtered
out
[ 34.290434] ata1.00: ACPI cmd ef/10:04:00:00:00:a0 (SET FEATURES) succeeded
[ 34.290689] ata1.00: ACPI cmd ef/10:05:00:00:00:a0 (SET FEATURES) rejected
by device (Stat=0x51 Err=0x04)
...
I resolved the problem by changing from AHCI to IDE in the laptop's
BIOS.
--
Multiple ATA Exception Emask, NCQ disabled etc during boot
https://bugs.launchpad.net/bugs/353812
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