linux-kernel - Re: linux-next on thinkpad x60: full battery is indicated as battery error in mate

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Message-ID: <20180312223521.vzccevf6z7ik5ysf@thinkpad>
Date:   Mon, 12 Mar 2018 23:35:21 +0100
From:   Ognjen Galić <smclt30p@...il.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Pavel Machek <pavel@....cz>,
        kernel list <linux-kernel@...r.kernel.org>,
        ACPI mailing list <linux-acpi@...r.kernel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Sebastian Reichel <sre@...nel.org>
Subject: Re: linux-next on thinkpad x60: full battery is indicated as battery
 error in mate

On Mon, Mar 12, 2018 at 11:29:56PM +0100, Rafael J. Wysocki wrote:
> On Mon, Mar 12, 2018 at 8:49 PM, Pavel Machek <pavel@....cz> wrote:
> > On Mon 2018-03-12 20:47:15, Pavel Machek wrote:
> >> Hi!
> >>
> >> Did something change recently with battery reporting?
> 
> Yes, it did, and specifically for Thinkpads.


> 
> >> Fully charged
> >> battery shows as empty battery with red "x" in Mate desktop. After
> >> reboot to recent mainline problem goes away. Tooltip says "battery
> >> waiting to charge".
> >>

For the MATE bug see:
https://github.com/mate-desktop/mate-power-manager/pull/251

The problem is in the new composite battery system in UPower, it
"merges" two external batteries into a single one for reporting. That
battery does not understand "Not Charging" inside the MATE Power
Manager. The above patch fixes that in MATE.

> >> /proc/acpi/battery/BAT0/state looks ok:
> >> present:                 yes
> >> capacity state:          ok
> >> charging state:          charged
> >> present rate:            0 mW
> >> remaining capacity:      41240 mWh
> >> present voltage:         16495 mV
> >>
> >> Linux amd 4.16.0-rc3-next-20180302 #30 SMP Fri Mar 2 10:28:44 CET 2018
> >> i686 GNU/Linux
> >> pavel@amd:~$ cat /sys/class/power_supply/BAT0/status
> >> Not charging
> >
> > Reboot to mainline:
> >
> > pavel@amd:~$ uname -a
> > Linux amd 4.16.0-rc4+ #509 SMP Thu Mar 8 15:28:06 CET 2018 i686
> > GNU/Linux
> > pavel@amd:~$ cat /sys/class/power_supply/BAT0/status
> > Unknown
> >
> > Mate shows it as "laptop battery is fully charged".
> >
> >> Thinkpad X60.
> 
> Please try to revert commits fa93854f7a7e..a20136a67a99 from
> linux-next and see if that helps.