[Letux-kernel] Strange things happening with latest kernels

[Andreas Kemnade]

On Thu, 13 Jun 2019 15:45:42 +0200
"H. Nikolaus Schaller" <hns at goldelico.com> wrote:

> > Am 13.06.2019 um 11:08 schrieb H. Nikolaus Schaller <hns at goldelico.com>:
> > 
> > Hi Andreas,
> >   
> >> Am 13.06.2019 um 07:47 schrieb Andreas Kemnade <andreas at kemnade.info>:
> >> 
> >> Hi Nikolaus,
> >> 
> >> On Thu, 13 Jun 2019 07:37:46 +0200
> >> "H. Nikolaus Schaller" <hns at goldelico.com> wrote:
> >>   
> >>> Hi Andreas,
> >>> great analysis!
> >>> 
> >>> Maybe I was lucky with my GTA04A4 where I tried these days.
> >>> 
> >>> A theory is that if the opp voltages are not supported, they are not changed and the value initialized
> >>> by U-Boot is kept. This will be wrong depending on clock speed.
> >>>   
> >> Well, the whole frequency-scaling thing seems to be disabled.
> >> 5.1 seems still to work. I have reasonable percentages for 300Mhz here.
> >>   
> >>> I remember there was a discussion these days on linux-omap for the DRA7 about similar regulator issues,
> >>> but have forgotten the details.
> >>> 
> >>> So we should notify Tony about this.
> >>>   
> >> will probably write an email this evening about that. Unfortunately my autobuild
> >> was not active when the things were merged into linus/master. So I have only the
> >> interesting logs about linux-next  
> > 
> > I can confirm that the issue is OMAP3 (twl4030) only and not on the Pyra.
> > And your patch makes cpufreq-info become available again.
> > 
> > And I have done some more tests and it looks as if power consumption
> > (battery current if not charging) in idle has gone up from letux-4.19(.0)
> > to 4.19.44 and again for 4.19.49 by ca. 50mA.
> > 
> > This happens if X11 is disabled or enabled. With X11 I have ca. 50-60% in
> > 800 MHz OPP although the CPU load is below 10%.
> > 
> > Well, it may also be some repeating background activity which may prevent
> > lower clock in my GUI setup (have used QuantumSTEP and not e.g. LXDE
> > and have updated some parts in QuantumSTEP recently).
> > 
> > Something which needs deeper inspection to understand the influencing
> > factors.  
> 
> As soon as I start X11, temperature goes up. Battery temp to 55.1°C and OMAP3
> reports 90°C during charging.
> 
Strange thing, Does it depend on how X is accessing the fb (omapfb vs. fbdev vs. modesetting
driver)? SGX active vs. not active.

Regards,
Andreas
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