linux-kernel - Re: 2.6.24-rc4-git5: Reported regressions from 2.6.23

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Date:	Sat, 8 Dec 2007 09:28:15 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Fabio Comolli <fabio.comolli@...il.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg KH <gregkh@...e.de>, Len Brown <lenb@...nel.org>
Subject: Re: 2.6.24-rc4-git5: Reported regressions from 2.6.23


* Fabio Comolli <fabio.comolli@...il.com> wrote:

> <snip>
> 
> > Subject         : Battery shows up twice in kpowersave
> > Submitter       : Rolf Eike Beer <eike-kernel@...tec.de>
> > References      : http://bugzilla.kernel.org/show_bug.cgi?id=9494
> > Handled-By      : Alexey Starikovskiy <astarikovskiy@...e.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:

| 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.

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?

	Ingo
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