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From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Andrew Morton <akpm@linux-foundation.org>
Subject: Re: 2.6.24-rc4-git5: Reported regressions from 2.6.23
Date: Sat, 8 Dec 2007 23:11:14 +0100
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Cc: Ingo Molnar <mingo@elte.hu>, Fabio Comolli <fabio.comolli@gmail.com>,
       LKML <linux-kernel@vger.kernel.org>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Greg KH <gregkh@suse.de>, Len Brown <lenb@kernel.org>,
       Alexey Starikovskiy <astarikovskiy@suse.de>
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On Saturday, 8 of December 2007, Andrew Morton wrote:
> On Sat, 8 Dec 2007 09:28:15 +0100 Ingo Molnar <mingo@elte.hu> wrote:
> 
> > 
> > * Fabio Comolli <fabio.comolli@gmail.com> wrote:
> > 
> > > <snip>
> > > 
> > > > Subject         : Battery shows up twice in kpowersave
> > > > Submitter       : Rolf Eike Beer <eike-kernel@sf-tec.de>
> > > > References      : http://bugzilla.kernel.org/show_bug.cgi?id=9494
> > > > Handled-By      : Alexey Starikovskiy <astarikovskiy@suse.de>
> > > > Patch           :
> > > >
> > > 
> > > I don't think that this is a regression: I reported on RedHat bugzilla 
> > > when I switched from F7 to F8 and I was using 2.6.23.8 at that time. 
> > > It looks to me an HAL regression, but of course I may be wrong :-) as 
> > > the reported bisected to a bad commit.
> > > 
> > > https://bugzilla.redhat.com/show_bug.cgi?id=373041
> > > 
> > > By the way, I now switched to Fedrora Rawhide with a 2.6.24-rc4-git5 
> > > custom kernel and Gnome desktop and the problem is still present, even 
> > > with gnome-power-manager.
> > 
> > to me this looks like an ABI regression - utilities should work without 
> > change. Something changed in /sys output that caused HAL to think that 
> > there are two batteries:
> 
> Yep.  Although HAL is of course a most special case of "userspace".
> 
> > | The output of lshal shows that there are two UDI's with 
> > | info.capabilities = { 'battery' }:
> > |
> > | udi = '/org/freedesktop/Hal/devices/acpi_BAT0'
> > | udi = '/org/freedesktop/Hal/devices/computer_power_supply_0'
> > 
> > whether it's a HAL bug or a kernel bug, the original state should be 
> > restored and it should be worked out without breaking users of older HAL 
> > versions.
> 
> "breaking users of older HAL versions" == "breaking machines".
> 
> The patch should be reverted.  Do we know which one it was?
> 
> > grumble: way too many times do various system utilities break when i 
> > upgrade the kernel on my laptop. Maybe a new debug mechanism: we should 
> > start fingerprinting the exact /sys and /proc output and enforce that 
> > it's immutable across kernel releases as long as the hardware is 
> > unmodified?
> 
> That would be neat.  It would need to be executed on a lot of different
> machines.

Hm, that wouldn't allow us to add new attributes ...
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