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To: "Yu, Luming" <luming.yu@intel.com>
cc: linux-kernel@vger.kernel.org, "Linus Torvalds" <torvalds@osdl.org>,
       "Andrew Morton" <akpm@osdl.org>, "Tom Seeley" <redhat@tomseeley.co.uk>,
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       jgarzik@pobox.com, "Duncan" <1i5t5.duncan@cox.net>,
       "Pavlik Vojtech" <vojtech@suse.cz>, "Meelis Roos" <mroos@linux.ee>
Subject: Re: 2.6.16-rc5: known regressions [TP 600X S3, vanilla DSDT] 
In-Reply-To: Your message of "Wed, 22 Mar 2006 09:30:04 +0800."
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Date: Wed, 22 Mar 2006 02:15:09 -0500
From: Sanjoy Mahajan <sanjoy@mrao.cam.ac.uk>
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So the kernel with this UPDT() hung at the 2nd sleep:

                    Method (UPDT, 0, NotSerialized)
                    {
                        If (IGNR)
                        {
                            Decrement (IGNR)
                        }
                        Else
                        {
                            If (H8DR)
                            {
                                If (Acquire (I2CM, 0x0064)) {}
                                Else
                                {
                                    Store (I2RB (Zero, 0x01, 0x04), Local7)
                                    If (Local7)
                                    {
                                        Fatal (0x01, 0x80000003, Local7)
                                    }

                                    Release (I2CM)
                                }
                            }
                        }
                    }

Relative to a working kernel (well, a kernel that I could get to hang
only once, and then all reboots afterwards it never would hang), these
are the extra lines:

                                    Store (I2RB (Zero, 0x01, 0x04), Local7)
                                    If (Local7)
                                    {
                                        Fatal (0x01, 0x80000003, Local7)
                                    }

Since I don't think Fatal() isn't being called, I guess the problem is
in I2RB.  But all those magic numbers in I2RB make me recultant to take
out lines, unless you tell me which changes won't harm the hardware.

-Sanjoy

`A society of sheep must in time beget a government of wolves.'
   - Bertrand de Jouvenal
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