[Letux-kernel] Strange things happening with latest kernels

[H. Nikolaus Schaller]

> Am 13.06.2019 um 18:33 schrieb Andreas Kemnade <andreas at kemnade.info>:
> 
> Hi,
> 
> On Thu, 13 Jun 2019 18:08:12 +0200
> "H. Nikolaus Schaller" <hns at goldelico.com> wrote:
> 
>>> Am 13.06.2019 um 17:51 schrieb Andreas Kemnade <andreas at kemnade.info>:
>>> 
>>> 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>:
>>>>> 
>>>>> 
>>>>> 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.  
>> 
>> Have not yet tested into that direction. SGX is not compiled into any of the
>> kernels I have tried.
>> 
>> Next thing is to test with LXDE or XfCE. And try a build with omap2plus_defconfig.
>> 
> maybe there are multiple problems working together to heat up omap3.

Yes, looks so. I just never had experienced that on OMAP3 before. Just
on OMAP5...

> I doubt cpufreq alone causes such problems. But I will test, if
> everything is idle, things should be powered down anyways regardless of
> cpufreq
> 
> When I had a hot gta04 in the past, it was always at a bad time.
> Touchscreen did not work. Last time was when I wanted to use the gta04
> to show me the way from Brussels midi to my hotel for fosdem. That
> was with 4.17 kernel.

And strangely there aren't many recent omap3 specific changes in 4.19..4.19.49

iMac:master hns$ git log v4.19..v4.19.49 --oneline arch/arm/mach-omap2/
30d503bae967 ARM: avoid Cortex-A9 livelock on tight dmb loops
f49f7007de59 ARM: OMAP2+: fix lack of timer interrupts on CPU1 after hotplug
f3f7a8b6faf8 ARM: OMAP2+: Variable "reg" in function omap4_dsi_mux_pads() could be uninitialized
1b1de8b95b97 ARM: OMAP5+: Fix inverted nirq pin interrupts with irq_set_type
8218fcf4666c ARM: OMAP2+: hwmod: Fix some section annotations
5a8fbba77bf8 ARM: OMAP2+: prm44xx: Fix section annotation on omap44xx_prm_enable_io_wakeup
iMac:master hns$ 

So it might be some (clock?) driver but there are just 2 patches in drivers/clk/ti.

Maybe I just never had recognised this because the room temperature was lower?
On the other hand, the GTA04 is really getting hot (with risk for battery damage).

BR,
Nikolaus