http://bugzilla.kernel.org/show_bug.cgi?id=8186





------- Additional Comments From [EMAIL PROTECTED]  2007-06-01 07:48 -------
I am now operating reasonably well, having done 3 things:

1) Running kernel 2.6.22-rc3  (in 2.6.20 versions, I was able to use
pci=routeirq as the only kernel option, once I did the below stuff, apparently
initializing the IOAPIC better than it was being set up without that option). 
Also upgraded to F.28 BIOS - which has been released on HP website.

2) removing hwclock --systohc call from my shutdown scripts (causes hang at
shutdown otherwise)

3) using nvidia proprietary X screen driver.  

Here's my theory:  (1) F.28 BIOS apparently changes a lot in ACPI area.  It has
more tables and different ones.  It may also initialize IOAPIC differently when
ACPI is turned on, thus obviating need for pci=routeirq. 2.6.22 fixes lots of
sata-nv and timer related bugs (zillions of changes in that space, and I don't
want to bother doing git bisect). (2) relates to the *very* different code in
i386 and x86_64 for basic interrupts and rtc functions - maintainers should get
their act together, but who am I to criticize.  (3) is incredibly hard to debug,
because it happens after screen is turned off, there is no serial port, and
firescope doesn't work, because of hard hang.  I am hoping to play with
"nouveau" rather than "nv".


Given the timer problems, I am waiting for the tickless x86_64 updates before I
do more poking than I have been doing.

[For those who want a workaround, pull 2.6.22rc3, do the "make oldconfig" with
your old .config, and make sure you have the F.28 BIOS.   This allowed me to
boot with no special boot parameters, leaving me still with problems with X and
/dev/rtc - but not showstoppers.]



In any case, for people running compatible x86_64 

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