[Bug 200057] [NEW] HP / Compaq laptops crash with port 0x80 delay write

Joel Stanley joel.stan at gmail.com
Sun Mar 9 05:17:38 UTC 2008


Public bug reported:

Binary package hint: linux-image-generic

There are a number of AMD based laptops manufactured by Quanta which
will hard lock when doing a port 0x80 delay write. Previously,
workarounds included booting with certain boot options (which I assume
disabled the use of drivers that used these delay writes, but would also
disable other useful functionality). 2.6.25 introduced an alternate
delay method; from the patch which fixes this issue:

"Certain (HP) laptops experience trouble from our port 0x80 I/O delay
writes. This patch provides for a DMI based switch to the "alternate
diagnostic port" 0xed (as used by some BIOSes as well) for these."

http://lkml.org/lkml/2007/12/13/591
http://lkml.org/lkml/2007/12/16/62

The git commit for the above patch is b02aae9cf52956dfe1bec73f77f81a3d05d3902b. There have been a couple of updates since then:
6e7c402590b75b6b45138792445ee0f0315a8473
f9fc58910ebc448b0b7d37af1bf57a896a78e9c4
d3cfeb4fbe2a5e88fd5f98892f4dc49dcab8a9e7

As this is in 2.6.25 (and only missed .24 because the patch was
developed late in the .24 development cycle), I would like to see it in
hardy's kernel. I have tested a kernel compiled from the hardy git tree
with this patch applied, and it fixes the problem on my HP Pavilion
tx1000 test machine.

** Affects: linux-meta (Ubuntu)
     Importance: Undecided
         Status: New

-- 
HP / Compaq laptops crash with port 0x80 delay write
https://bugs.launchpad.net/bugs/200057
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