Re: Battery-related regression between 2.6.17-git3 and 2.6.17-git6

[Rafael J. Wysocki]

On Monday 03 July 2006 21:44, Greg KH wrote:
> On Mon, Jul 03, 2006 at 09:39:22PM +0200, Rafael J. Wysocki wrote:
> > On Monday 03 July 2006 20:00, Greg KH wrote:
> > > On Mon, Jul 03, 2006 at 01:16:45PM +0200, Rafael J. Wysocki wrote:
> > > > Hi,
> > > > 
> > > > On Sunday 02 July 2006 11:15, Rafael J. Wysocki wrote:
> > > > > On Sunday 02 July 2006 00:21, Rafael J. Wysocki wrote:
> > > > > > With the recent -git on my box (Asus L5D, x86_64 SUSE 10) the powersave
> > > > > > demon is apparently unable to get the battery status, although the data in
> > > > > > /proc/acpi/battery/BAT0 seem to be correct.  As a result, battery status
> > > > > > notification via kpowersave doesn't work and it's hard to notice when the
> > > > > > battery is low/critical.
> > > > > > 
> > > > > > So far I have verified that this feature works fine with 2.6.17-git3 and
> > > > > > doesn't work with 2.6.17-git6 (-git5 doesn't compile here).
> > > > > > 
> > > > > > I'll try to get more information tomorrow (unless someone in the know has
> > > > > > an idea of what's up ;-) ).
> > > > > 
> > > > > I've verified that the problem first appeared in 2.6.17-git4.
> > > > 
> > > > Apparently this happens because powersaved takes the battery status
> > > > information from hald and the following kernel changes make hald crash on
> > > > my system:
> > > > 
> > > > http://kernel.org/git/gitweb.cgi?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=43104f1da88f5335e9a45695df92a735ad550dda
> > > > http://kernel.org/git/gitweb.cgi?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=bd00949647ddcea47ce4ea8bb2cfcfc98ebf9f2a
> > > > http://kernel.org/git/gitweb.cgi?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=c182274ffe1277f4e7c564719a696a37cacf74ea
> > > > http://kernel.org/git/gitweb.cgi?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=9bde7497e0b54178c317fac47a18be7f948dd471
> > > > http://kernel.org/git/gitweb.cgi?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=36679ea59846d8f34a48f71ca1a37671ca0ad3c5
> > > > 
> > > > (ie. after reverting them hald works again).
> > > 
> > > Ick, that should not cause any problems, as sysfs should look identical
> > > to how it was before those patches.  Except that the /sys/class/usb/
> > > stuff is now symlinks instead of real directories, but HAL has had to
> > > handle that for a long time now (and it's even documented in
> > > Documentation/ABI/testing/sysfs-class)
> > 
> > Well, apparently one of them happens to trigger a buffer overflow in "my"
> > version of hal. ;-)
> > 
> > > Can you tell me exactly which of the above patches breaks HAL?
> > 
> > That would be quite a bit of testing and now I'm sure it's a hal issue.
> 
> git bisect would help out a lot.  Or just ask the HAL developers, they
> might know.

Anyway I'd have to compile and test at least a couple of kernels.
[For the record: I'm quite sure that 36679ea59846d8f34a48f71ca1a37671ca0ad3c5
and 9bde7497e0b54178c317fac47a18be7f948dd471 together break hal on
my system; this seems to be related to endpoints' paths in sysfs.]

> > > Which version of HAL are you using?  I have 0.5.7 here and it works just
> > > fine.
> > 
> > 0.5.4 :-(
> 
> Can you upgrade to a newer version?  SuSE 10.1 is out which should work
> just fine...

Yes, it should.  Still, I think I'll try to upgrade hal alone first.

Thanks,
Rafael
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