linux-kernel - Re: x86-PAT tree merge causes keyboard problems

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Message-ID: <20090916052657.GA1897@phenom2.trippelsdorf.de>
Date:	Wed, 16 Sep 2009 07:26:57 +0200
From:	Markus Trippelsdorf <markus@...ppelsdorf.de>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	venkatesh.pallipadi@...el.com, suresh.b.siddha@...el.com,
	linux-kernel@...r.kernel.org
Subject: Re: x86-PAT tree merge causes keyboard problems

On Tue, Sep 15, 2009 at 03:44:16PM -0700, H. Peter Anvin wrote:
> On 09/15/2009 01:52 PM, Markus Trippelsdorf wrote:
> > The merge of the PAT tree today breaks certain key combinations of my
> > keyboard.  For example I switch my virtual desktops with
> > ctrl-alt-left/right and this combination stops working. Basically all
> > keyboard combinations involving the left alt key are broken on my
> > machine as a result of this merge.
> 
> > I bisected this down to:
> > 
> > »
> > 335ef896d4c6639849d79367f0fef9abc06d121b is the first bad commit
> > commit 335ef896d4c6639849d79367f0fef9abc06d121b
> > Author: Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>
> > Date:   Fri Jul 10 09:57:36 2009 -0700
> > 
> >     x86, pat: Add rbtree to do quick lookup in memtype tracking
> 
> I think we have a winner for the second bizarrest bug report I've ever
> seen[1].  Not doubting you in any way, just that it is clearly a very
> strange combination of things at play here.

Haha, I knew that it would sound ridiculous... 

> We need more information about your system, the lspci -vv and dmidecode
> output, as well as your entire dmesg, and a dump of
> /debug/x86/pat_memtype_list.

OK. I've attached most of those.
The Xorg.log is also interesting:

(EE) XKB: Could not invoke xkbcomp
(EE) XKB: Couldn't compile keymap
(WW) Couldn't load XKB keymap, falling back to pre-XKB keymap

-- 
Markus

View attachment "lspci" of type "text/plain" (14570 bytes)

View attachment "dmidecode" of type "text/plain" (18456 bytes)

View attachment "Xorg_diff" of type "text/plain" (3295 bytes)

View attachment "dmesg" of type "text/plain" (28112 bytes)