> There were no ACPI changes between 2.6.6 and 2.6.6-bk1. The change my newbie eye sees here is that the effect of CONFIG_ACPI=y changes from imperceptible in 2.6.6 to kernel won't boot in 2.6.6-bk1. > Does 2.6.6 work for you? 2.6.6 works for me, yes, as did 2.6.5, 2.6.4, etc. ... $ grep 'CONFIG_ACPI=' .config CONFIG_ACPI=y $ grep 'ACPI.*=y$' .config | grep -v '^#' | wc -l 16 $ The motherboard labels in front of me include: "INTEL DESKTOP BOARD" "D865GBF/D865PERC". > > > ACPI: Subsystem revision 20040326 ... > > > [<c01eef72>] acpi_ev_save_method_info+0x44/0x75 ... > > > Unable to handle kernel NULL pointer dereferencec01e1194 ... > > > Kernel panic: Aiee, killing interrupt handler! ... > > > Unable <o ha1dleUn kernel NULL pointer dereferenceer > > dereferenceOoops: ... > > > Unable to handle kernel NULL pointer dereference at virtual address > > ... > > > > Theory confirmed: > > > > Deleting CONFIG_ACPI=y etc. via `make xconfig` fixes this. > > what theory? Thanks for making the time to say I was unclear. In launching a thread titled "oops ACPI" I was guessing that lossy dmesg spew appearing immediately past "ACPI: Subsystem revision 20040326" was caused by me living too close to `make defconfig`. I then revisited `make xconfig`, asked to turn off ACPI, and suddenly life got better. I'm working from local copies of the kernel.org files: $ ls -l *2.6.6* -rw-rw-r-- 1 pat pat 34896138 May 10 11:14 linux-2.6.6.tar.bz2 -rw------- 1 pat pat 1072216 May 12 08:47 patch-2.6.6-bk1.bz2 $ I can fsck the containing volume, but I haven't yet otherwise learned how to crc-check their integrity. Pat LaVarre -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/