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Bug#991453: linux-image-5.10.0-8-amd64: Radeon 6800 XT: 100% GPU core usage & 74 Watts when idle

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On zaterdag 24 juli 2021 22:03:23 CEST Diederik de Haas wrote:
> > It's already backported to 5.10, just after 5.10.46 was released:
> > https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h
> > =l inux-5.10.y&id=fea853aca3210c21dfcf07bb82d501b7fd1900a7
> 
> Just found out the reverted commit was introduced just before the 5.10.46
> tag was created, which should mean that any version before 5.10.46 should
> NOT have this problem. 

I just found out it's 2 commits that should be reverted
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-5.10.y&id=1bd81429d53ded4e111616c755a64fad80849354
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-5.10.y&id=fea853aca3210c21dfcf07bb82d501b7fd1900a7

The first one I saved (and attached) as 'fix-bug991453-part1.patch' and the 
second one as 'fix-bug991453-part1.patch'

Then I followed step 4.2.1 and 4.2.2 of the kernel handbook:
https://kernel-team.pages.debian.net/kernel-handbook/ch-common-tasks.html#s-common-official
That resulted in 'linux-image-5.10.0-8-amd64-unsigned_5.10.46-2a~test_amd64.deb'
which I then installed on my system and rebooted into that.

$ uname -a
Linux bagend 5.10.0-8-amd64 #1 SMP Debian 5.10.46-2a~test (2021-07-24) x86_64 GNU/Linux
$ cat /sys/class/drm/card0/device/gpu_busy_percent

0
$ sensors
nvme-pci-0100
Adapter: PCI adapter
Composite:    +40.9°C  (low  = -273.1°C, high = +72.8°C)
                       (crit = +75.8°C)
Sensor 1:     +40.9°C  (low  = -273.1°C, high = +65261.8°C)
Sensor 2:     +51.9°C  (low  = -273.1°C, high = +65261.8°C)

amdgpu-pci-0c00
Adapter: PCI adapter
vddgfx:      750.00 mV 
fan1:        1208 RPM  (min =    0 RPM, max = 3500 RPM)
edge:         +42.0°C  (crit = +85.0°C, hyst = -273.1°C)
                       (emerg = +90.0°C)
junction:     +42.0°C  (crit = +105.0°C, hyst = -273.1°C)
                       (emerg = +110.0°C)
mem:          +43.0°C  (crit = +95.0°C, hyst = -273.1°C)
                       (emerg = +100.0°C)
power1:        7.00 W  (cap = 260.00 W)

k10temp-pci-00c3
Adapter: PCI adapter
Tctl:         +76.5°C  
Tdie:         +56.5°C

# radeontop
Graphics pipe 0.83%
0.17G / 0.94G Memory Clock 17.67%
0.03G / 1.63G Shader Clock  1.78%

These are the same 'scores' as I had with the 5.10.0-7-amd64 kernel.
So applying the mentioned/attached patches on top of the current kernel
as available in Debian Testing/Bullseye and Sid, fixes the problem.

In the last year I've spend considerable time to bring down my energy
usage/needs and I never expected that (reverting) 2 kernel commits
would save me 67W (continuously), so thank you very much piorunz for
bringing this to my attention.
I normally have a quiet system and noticed it often wasn't quiet lately; 
I blame(d) 'baloo' (file indexing) for that, but it turns out it was mostly
my GPU running at 100% all the time.

As it looks like a lot of users with AMD GPUs are affected and the 
considerable energy wasted because of it (Climate Change), 
I really hope/urge that these 2 patches/reverts are applied before Bullseye
gets released.

Cheers,
  Diederik

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Bug#991453: linux-image-5.10.0-8-amd64: Radeon 6800 XT: 100% GPU core usage & 74 Watts when idle Diederik de Haas <didi.debian@cknow.org> - 2021-07-24 14:30 +0200
  Bug#991453: linux-image-5.10.0-8-amd64: Radeon 6800 XT: 100% GPU core usage & 74 Watts when idle Diederik de Haas <didi.debian@cknow.org> - 2021-07-24 22:10 +0200
    Bug#991453: linux-image-5.10.0-8-amd64: Radeon 6800 XT: 100% GPU core usage & 74 Watts when idle Diederik de Haas <didi.debian@cknow.org> - 2021-07-25 01:20 +0200

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