Fw: FreebSD12 xorg with -AMDGPU- RADEON

[andrew glaeser]

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Some more measures were taken:

* power-supply replaced with a more recent efficient one
* 8 cm, 5 V case-fan replaced with PWM-regulated 12 cm fan
* extra air-inlets drilled into the case-lid, does not really matter, if you
  have found the computer-case on the trash-yard, I know, kind of ridiculous,
  100% hand-made, even freehand drilled
* thermal grease renewed below CPU-cooler
* CPU-fan replaced with a more performant new fan

So, since all possible sources of failure have been ruled out, that irq-18
kept reappearing because of a too high surrounding air-temperature. We have
another heat-wave here in Berlin currently, today or tomorrow is the peak
around 35° C. This means irq-18 appears over 30°C temperature already at
boot-time and it will not go away, regardless of fan-configuration, unless
you lower CPU-core clock. This is a complex problem.
For instance today, about one hour ago I had to lower the CPU-clock to 1.7
GHz (with no core-boost) instead of the nominal 3.6 GHz in order to get rid
of irq-18 throttling. Obviously this has a severe impact on
system-performance, so next time, when I upgrade the system to current DDR4
RAM, I am going to go for a 35 W A-series APU, this box had 65 W of nominal
TDP, but without the graphics-card, with CPU-graphics only.




Begin forwarded message:

Date: Thu, 15 Aug 2019 13:23:12 +0200
From: andrew glaeser <bugs at irregulaire.info>
To: freebsd-x11 at freebsd.org, debian-x at lists.debian.org,
memberservices at amd-member.com Subject: Re: Fw: FreebSD12 xorg with -AMDGPU-
RADEON


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I struggled for some more days with system-stability with Radeon 6450 card:

* extra 8 cm case-fan installed, see jpg-attachment
* memory-frequency limited to 1300 (instead of 1600 MHz auto-mode),
* PCB-CPU-turbo disabled,
* AMD memory-profile enabled,
* finally # echo 'radeon.pcie_gen2="0"' >> /boot/loader.conf

I do hope I have a stable system now, see attached [dmesg.tx.xz]

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