Bugzilla Bug 112601

The newer kernels gentoo-2.6.13-r9 and gentoo-2.6.14-r2 fail to boot when ACPI
has been enabled in the kernel configuration. Kernel gentoo-2.6.12-r6 works fine
(i.e. the same kernel as on the 2005.1 livecd).

When booting the 2005.1 livecd, make sure to give either acpi=off or acpi=on as
kernel boot parameter, otherwise the cpu fan will not start!!!

Without ACPI the newer kernels do boot fine. So something between 2.6.12 and
2.6.13 seems to have broken ACPI on the HP nw8240 laptop.


NOTE: with 2.6.12 ACPI works rather well. CPU frequency scaling works, as does
the adjustment of the fan speed depending on the load. Newer kernels just don't
boot.


Reproducible: Always
Steps to Reproduce:
1. Get a HP nw8240 laptop
2. Install gentoo and try a gentoo-2.6.13 or 2.6.14 kernel
3. Try to boot a post 2.6.12 kernel with ACPI enabled

(Sorry, I know these steps sound easier than they are... ;-)

Actual Results:  
Kernel freezes during boot (i.e. during the kernel initialization sequence).


Expected Results:  
Behave like a good kernel, such as 2.6.12 and boot and manage ACPI correctly.

I'll try to get some kernel messages later, although that will mean writing it
down and typing it in again as this is during the kernel initialization process.

Please see if this is reproducible on the latest development kernel (currently
vanilla-sources-2.6.15_rc2)

Created an attachment (id=73589) [details]
Screenshot kernel hang vanilla-2.6.15_r2

Ok,

I tried vanilla-sources-2.6.15_r2. I just took the .config from the
gentoo-2.6.12-r6 and did a make oldconfig and enterred through all the new
options.

Next I booted with the new kernel and took a picture.

So, anything newer than 2.6.12 seems to have a broken ACPI for the HP nw8240
laptop. This one has a Centrino chipset.

Created an attachment (id=73591) [details]
.config for 2.6.15_r2 kernel

Created an attachment (id=73592) [details]
.config for gentoo-sources-2.6.12-r6

Created an attachment (id=73593) [details]
dmesg log of successful boot of gentoo-sources-2.6.12-r6

Created an attachment (id=73594) [details]
output of "emerge info"

This is some additional information that might help.

Created an attachment (id=73595) [details]
Output of lspci

Please try this patch:

https://bugzilla.novell.com/attachment.cgi?id=51332&action=view

Maybe related bugs:
https://bugzilla.novell.com/show_bug.cgi?id=116763
http://bugzilla.kernel.org/show_bug.cgi?id=5221

I tested this fix and now booting works fine.

The booting process seems to be a bit slower than with gentoo-sources-2.6.12-r6,
but it works. I might have to tweak the 2.6.15_rc2 a bit more.

As far as ACPI goes it now seems to work fine. This patch may very well be
applicable to the 2.6.13 and 2.6.14 kernels. I think the maybe related bugs are
definitely related ;-). Thanks for that info.

I think I'll stick with 2.6.12 for now as it works fine for me, but I will try
out the newer gentoo-sources as they come available as stable.

will track upstream bug

fixed upstream

http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=bd7ce5b5ff930c29b1c0405051e9c9388660b785

Fixed in genpatches-2.6.14-5 / gentoo-sources-2.6.14-r4