linux-kernel - Re: 2.6.22-rcX Transmeta/APM regression

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Date:	29 Jun 2007 23:03:43 -0400
From:	linux@...izon.com
To:	linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org
Cc:	ak@...e.de, bk@...e.de, hpa@...or.com, linux@...izon.com,
	michal.k.k.piotrowski@...il.com
Subject: Re: 2.6.22-rcX Transmeta/APM regression

Okay, after a ridiculous amount of bisecting and recompiling and
rebooting...

First I had to find out that the kernel stops booting as of
bf50467204: "i386: Use per-cpu GDT immediately on boot"
(With theis commit, it silently stops booting.  The GP fault I
posted earlier comes a little later, but I didn't bother finding it.)

and starts again as of
b0b73cb41d: "i386: msr.h: be paranoid about types and parentheses"

However, one commit before the former suspends properly, and the latter
fails to suspend (exactly the same problem at get_fixed_ranges+0x9/0x60),
so I had to bisect further between the two, backporting the msr.h changes
across the msr-index.h splitoff.

Anyway, the patch which introduces the problem is the aptly named 3ebad:
3ebad59056: [PATCH] x86: Save and restore the fixed-range MTRRs of the BSP when suspending

2.6.22-rc6 plus that one commit reverted successfully does APM suspend
(and resume) for me.
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