linux-kernel - Re: x60 backlight Re: [discuss] 2.6.19-rc1: known regressions (v2)

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Date:	Mon, 16 Oct 2006 21:39:25 +0200
From:	"Michael S. Tsirkin" <mst@...lanox.co.il>
To:	Adrian Bunk <bunk@...sta.de>
Cc:	Pavel Machek <pavel@...e.cz>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	len.brown@...el.com, linux-acpi@...r.kernel.org, linux-pm@...l.org,
	Jeff Garzik <jeff@...zik.org>
Subject: Re: x60 backlight Re: [discuss] 2.6.19-rc1: known regressions (v2)

Quoting r. Adrian Bunk <bunk@...sta.de>:
> Subject: Re: x60 backlight Re: [discuss] 2.6.19-rc1: known regressions (v2)
> 
> On Sun, Oct 08, 2006 at 07:59:58PM +0200, Michael S. Tsirkin wrote:
> > Quoting r. Adrian Bunk <bunk@...sta.de>:
> > > Subject: Re: x60 backlight Re: [discuss] 2.6.19-rc1: known regressions (v2)
> > > 
> > > On Sun, Oct 08, 2006 at 07:12:54AM +0000, Pavel Machek wrote:
> > > > 
> > > > On Sat 07-10-06 23:46:21, Adrian Bunk wrote:
> > > > > This email lists some known regressions in 2.6.19-rc1 compared to 2.6.18
> > > > > that are not yet fixed Linus' tree.
> > > > > 
> > > > ...
> > > > > Subject    : T60 stops triggering any ACPI events
> > > > > References : http://lkml.org/lkml/2006/10/4/425
> > > > > Submitter  : "Michael S. Tsirkin" <mst@...lanox.co.il>
> > > > > Status     : unknown
> > 
> > This was on a pre -rc1 git tree.
> > I've been using -rc1 since it's out and does not happen to me anymore.
> > So we probably can write this off as a memory corruption
> > issue that got fixed in between.
> 
> Thanks for the information, I've removed it from the list.
 

Unfortunately, this came back after using 2.6.19-rc1 for a couple of days
without reboot. And I just re-tested and was able to re-produce the problem on
2.6.19-rc2, as well. So the problem is still there, with the same symptoms:
after usig machine for a while, or under stress (e.g. if I do a full kernel
compile), I stop getting any ACPI events.

tail -f /var/log/acpid
does not show anything, even on Fn/F4 which is supposed ot be always enabled.
Restarting the acpid doesn't do anything either - ACPI starts working
again, for a while, only after reboot.

Worked fine under 2.6.18 (I was running vanilla + this patch
http://lkml.org/lkml/2006/7/20/56 which made it into upstream since then).

Any ideas? How to debug this?

-- 
MST
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