[Letux-kernel] Strange things happening with latest kernels

[Andreas Kemnade]

On Tue, 18 Jun 2019 15:06:49 +0200
"H. Nikolaus Schaller" <hns at goldelico.com> wrote:

> > Am 17.06.2019 um 21:56 schrieb H. Nikolaus Schaller <hns at goldelico.com>:
> > 
> > Hi Andreas,
> >   
> >> Am 15.06.2019 um 18:46 schrieb H. Nikolaus Schaller <hns at goldelico.com>:
> >>   
> > 
> > I have just made another strange observation:
> > 
> > login: root
> > password:
> > 
> > root at letux:~# ./temperatures 
> > Sat Jan 1 00:50:10 UTC 2000 58° 3648mV 800MHz
> > root at letux:~# ./temperatures 
> > Sat Jan 1 00:50:16 UTC 2000 67° 3642mV 800MHz
> > root at letux:~# ./temperatures 
> > Sat Jan 1 00:50:18 UTC 2000 67° 3642mV 800MHz
> > root at letux:~# ./temperatures 
> > Sat Jan 1 00:50:20 UTC 2000 67° 3648mV 800MHz
> > root at letux:~# 
> > 
> > The first call shows a lower temperature and
> > with the second the temperature jumps up suddenly
> > by 9° and stays there.
> > 
> > I can try to check with the Thermocamera if it
> > really gets hotter...
> > 
> > Or try this in a loop without some seconds delay
> > to see if there is a gradual increase.
> > 
> > This is with letux-5.2-rc5 on gta04. Please note that
> > I forgot to merge the twl4030-opp-fix so that
> > I will rebuild letux-5.2-rc5 sources and binaries
> > again.  
> 
> I have done some tests and it seems as if the
> first temperature test (even 5 minutes after boot)
> is significantly lower than those after:
> 
> letux login: root
> Password: 
> Last login: Sat Jan  1 14:58:38 UTC 2000 on console
> Linux letux 5.2.0-rc5-letux+ #296 SMP PREEMPT Tue Jun 18 09:36:52 CEST 2019 armv7l
> 
> The programs included with the Debian GNU/Linux system are free software;
> the exact distribution terms for each program are described in the
> individual files in /usr/share/doc/*/copyright.
> 
> Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
> permitted by applicable law.
> 
> !!!  LetuxOS WARNING                                                      !!!
> !!!  Root access through ssh and console with empty password is enabled.  !!!
> !!!  This is a big security hole.                                         !!!
> !!!  To disable, run 'apt-get remove letux-ssh-root'                      !!!
> 
> root at letux:~# cat /sys/class/thermal/thermal_zone0/temp
> 53500
> root at letux:~# cat /sys/class/thermal/thermal_zone0/temp
> 62000
> root at letux:~# cat /sys/class/thermal/thermal_zone0/temp
> 62000
> root at letux:~# cat /sys/class/thermal/thermal_zone0/temp
> 62000
> root at letux:~# cat /sys/class/thermal/thermal_zone0/temp
> 62000
> root at letux:~# cat /sys/class/thermal/thermal_zone0/temp
> 62000
> root at letux:~# cat /sys/class/thermal/thermal_zone0/temp
> 62000
> root at letux:~# cat /sys/class/thermal/thermal_zone0/temp
> 62000
> root at letux:~# cat /sys/class/thermal/thermal_zone0/temp
> 63500
> root at letux:~# cat /sys/class/thermal/thermal_zone0/temp
> 62000
> 
> There is a more or less systematic and immediate jump of +9°
> for the second request. Maybe a bug in the hwmon readout?

Maybe we are using old output and then reading triggers a new
measurement.
hmm, I tested with a letux 3704 with almost no modules loaded,
openmoko battery connected.
Readout with letux 5.2-rc4 + my regulator patch: quite stable:
32mA, 25 C Battery temp (=room temperature), 47C thermal_zone0.

I think we should start with the simplest system possible and
analyze things. I have the impression that something with display pm got
broken.

About unplanned heating: I think there might be some connection with
bad wifi reception (on GTA04A5 and Pyra), firmware trouble and kernel
going mad. BUt these two things are still on my list to investigate
things.
For the display testing I have to fix my scripts, so that they work
properly with backlight integrated into panel driver and without.
I think I have seen values like 30-35mA for display modules loaded
but display blank once. But last measurement seems to be higher,
so there seems to be something rotten.

Regards,
Andreas
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