Linux doesn't support AMD Turbo Core Technology on APU ?

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Menard
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Linux doesn't support AMD Turbo Core Technology on APU ?

Post by Menard » Thu May 09, 2019 9:04 am

Linux Mint 64 (18.1 to 19.2 versions tested) doesn't support AMD Turbo Core Technology on APUs dated 2013 2014 (when a hard drive is used ?)

A4 7300 tested
A8 7600 tested

My CPU is limited to 4x3100 MHz as in Windows XP 32 bits it reaches 4x3800 MHz.

I read another report from phoronics forum with the A8 7600 and this person experiences the same issues but he didn't test CPU Frequency so he stayed to the conclusion that with hard disk and this CPU, Linux Mint faces freezes and bad experience. He tested other Linux distributions and it was the same problem.
With SSD there is no issue. Some forumers spoke of a problem with HD latency, and Linux would not like this (?)
Last edited by Menard on Tue May 21, 2019 6:38 am, edited 2 times in total.
Linux Mint 19.1 64bits Cinnamon (Kernel 4.18.0-15)
AMD APU A8 7600 (3100 MHz to 3800 MHz) with DDR3 1833 MHz 4 GB x2
(CPU limited to 4x 3100 Mhz default by no support of the Turbo-core, then after editing grub, supports up to only 3600 MHz)

Menard
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Re: Linux doesn't support AMD Turbo Core Technology on APU ?

Post by Menard » Tue May 21, 2019 6:35 am

Nobody ?
Linux Mint 19.1 64bits Cinnamon (Kernel 4.18.0-15)
AMD APU A8 7600 (3100 MHz to 3800 MHz) with DDR3 1833 MHz 4 GB x2
(CPU limited to 4x 3100 Mhz default by no support of the Turbo-core, then after editing grub, supports up to only 3600 MHz)

HaveaMint
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Re: Linux doesn't support AMD Turbo Core Technology on APU ?

Post by HaveaMint » Tue May 21, 2019 6:46 am

My A10 and A12 run fine for me. I haven't run either one with windows that came with them, as soon as I got them home windows was replaced with linux.
"Tune for maximum Smoke and then read the Instructions".

deepakdeshp
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Re: Linux doesn't support AMD Turbo Core Technology on APU ?

Post by deepakdeshp » Tue May 21, 2019 9:27 am

My a8 7410 processor works fine for me.
If I have helped you solve a problem, please add [SOLVED] to your first post title, it helps other users looking for help, and keeps the forum clean.
I am using Mint 19.1 Cinnamon 64 bit with AMD A8/7410 processor . Memory 8GB

sarge816
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Re: Linux doesn't support AMD Turbo Core Technology on APU ?

Post by sarge816 » Tue May 21, 2019 10:03 am

A6-6400K checking in, works perfectly in 19.1. My kid even games with it using WINE and has no complaints.

Menard
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Re: Linux doesn't support AMD Turbo Core Technology on APU ?

Post by Menard » Thu May 23, 2019 4:41 pm

OK thanks but did you really check it ? If I hadn't check i could have continued a long time with a false impression of "quite ok but...".
The best way to check CPU Frequency is $ sudo watch -n 0,5 cpupower monitor and they must be higher than the basic CPU frequency
For me it was stuck to 3100 MHz x4

I made great progresses now because I found the solution to fix this and it confirms that for me the problem is with Mint here, because for my APU a simple edition of the text in a file changed all ... Frequency is now 3400 to 3600 MHz x4 and CPU and GPU benchmarks are far better (+15% to +33%)

This changed text is in the file ./etc/default/grub :
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" remplacé par
GRUB_CMDLINE_LINUX_DEFAULT= "quiet splash radeon.bapm=1"

It remains to examine why the CPU Freq governor does not keep the "Performance" rule after reboot and is set to "Ondemand"

It s is cool, it is now so nervous than a Win XP 32 bits with 2 GB RAM (2001 OS) as I am with Mint 19.1 64 bits 8 Go RAM (2019 OS) youppie !
I am joking :wink:
Linux Mint 19.1 64bits Cinnamon (Kernel 4.18.0-15)
AMD APU A8 7600 (3100 MHz to 3800 MHz) with DDR3 1833 MHz 4 GB x2
(CPU limited to 4x 3100 Mhz default by no support of the Turbo-core, then after editing grub, supports up to only 3600 MHz)

Menard
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Re: Linux doesn't support AMD Turbo Core Technology on APU ?

Post by Menard » Fri Jun 07, 2019 9:37 am

I can now add this :

Linux Ubuntu and Mint with their defaut grub file, don't support AMD Turbo Core on some AMD CPUs
Linux Mint 19.1 64bits Cinnamon (Kernel 4.18.0-15)
AMD APU A8 7600 (3100 MHz to 3800 MHz) with DDR3 1833 MHz 4 GB x2
(CPU limited to 4x 3100 Mhz default by no support of the Turbo-core, then after editing grub, supports up to only 3600 MHz)

Hoser Rob
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Re: Linux doesn't support AMD Turbo Core Technology on APU ?

Post by Hoser Rob » Fri Jun 07, 2019 9:58 am

The impression I'm getting from this ...

https://askubuntu.com/questions/459788/ ... untu-14-04

... is that to get amd turbo core you need to use the closed fglrx driver. This driver has been deprecated for some time and is unsupported in any currently supported Mint or Ubuntu release. If you could manage to install fglrx it'd defintiely break your video. The driver for those cards is the open source radeon driver, which you should already have.

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Re: Linux doesn't support AMD Turbo Core Technology on APU ?

Post by indihome » Sat Jun 08, 2019 2:08 am

Ryzen 2400g in lm 19.1 cinnamon, kernel 5.0015, no other modifications.

Cpu frequency sometimes runs up to 3.8Ghz, so no problem here.

Menard
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Re: Linux doesn't support AMD Turbo Core Technology on APU ?

Post by Menard » Sat Jun 08, 2019 6:35 am

Hoser Rob wrote:
Fri Jun 07, 2019 9:58 am
The impression I'm getting from this ...

https://askubuntu.com/questions/459788/ ... untu-14-04

... is that to get amd turbo core you need to use the closed fglrx driver. This driver has been deprecated for some time and is unsupported in any currently supported Mint or Ubuntu release. If you could manage to install fglrx it'd defintiely break your video. The driver for those cards is the open source radeon driver, which you should already have.
I don't know exactly what I have as driver.
All I can say is that with Mint 18.1 I had an AMD proprietary driver, but with the 19.1 I have no proprietary driver.
I think about re-trying with 18.1 from usb to make precise tests
Linux Mint 19.1 64bits Cinnamon (Kernel 4.18.0-15)
AMD APU A8 7600 (3100 MHz to 3800 MHz) with DDR3 1833 MHz 4 GB x2
(CPU limited to 4x 3100 Mhz default by no support of the Turbo-core, then after editing grub, supports up to only 3600 MHz)

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