ACPI problems [was: Long boot delay "Mounting Root Filesystem"]

[David Abrahams]

[Repost: sorry for the formatting on the previous post; that's what I get for
using the web forum interface :( ]

 Alf-Ivar Holm;1328653 Wrote: 
> I have similar problems with my Fujitsu Siemens S7020D with a
> linux-686 (non-SMP) kernel, but have not tried much of the stimuli
> approach, I have rather tried the nervous stare approach, where
> according to my /var/log/messages* it seems quite constant difference
> the last boots at what seems like 160 seconds, if my interpretation of
> the time stamp column is correct (this is from last boot, which can be
> seen with dmesg(8) as well):

Affi,

Thanks for pointing me at /var/log/messages*.  Between that and your
hint about consoles I figured out I could probably remove "quiet
splash" from my boot options to see what's going on.  I now no longer
believe stimulus makes any difference.  Here's where I see my delay:


   [17179570.956000] ICH7: IDE controller at PCI slot 0000:00:1f.1
   [17179570.956000] ACPI: PCI Interrupt 0000:00:1f.1[C] -> GSI 16 (level, low) -> IRQ 169
   [17179570.956000] ICH7: chipset revision 2
   [17179570.956000] ICH7: not 100%% native mode: will probe irqs later
   [17179570.956000]     ide0: BM-DMA at 0x1880-0x1887, BIOS settings: hda:DMA, hdb:pio
   [17179576.320000] hda: MATSHITADVD-RAM UJ-842, ATAPI CD/DVD-ROM drive
   [17179578.736000] ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
   [17179578.744000] hda: ATAPI 24X DVD-ROM DVD-R-RAM CD-R/RW drive, 2048kB Cache, UDMA(33)
   [17179578.744000] Uniform CD-ROM driver Revision: 3.20
   [17179578.776000] SCSI subsystem initialized
   [17179578.776000] ACPI: bus type scsi registered
   [17179578.776000] ACPI: PCI Interrupt 0000:00:1f.2[B] -> GSI 16 (level, low) -> IRQ 169

** long delay right here **

   [17179687.396000] ahci 0000:00:1f.2: AHCI 0001.0100 32 slots 4 ports 1.5 Gbps 0x1 impl SATA mode
   [17179687.396000] ahci 0000:00:1f.2: flags: 64bit ncq pm led clo pio slum part
   [17179687.396000] ata1: SATA max UDMA/133 cmd 0xF884C500 ctl 0x0 bmdma 0x0 irq 66

All of these lines were preceded by "Aug 2 09:34:31 localhost
kernel:".  I don't know what _that_ means; it sure doesn't reflect
real time!  Anyway, the results I'm seeing show a very suspicious
delay of exactly 9000000 of whatever those units are (a considerably
higher number than you're seeing).  Turning off ACPI makes this delay
go away of course, but this is a laptop so I really don't want to go
without power management!

Scouring the web for answers I see a lot of people with similar
problems.  Any further clues would be deeply appreciated.

Thanks in advance,

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com