[SOLVED] Why the system is still reserving 1 GB RAM as there is 1 GB on the Graphic PCI card ?

[Menard]

Hello

Notice that these 1 GB are required by the APU for itself, but the system doesn't use it, so why doesn't it free this memory ?

One possibility, the system try to use both graphics but with a very bad result in performances, worse than with each separately

Code: Select all

sudo inxi -cG
[sudo] Mot de passe de u3 :                   
Graphics:
  Device-1: AMD Kaveri [Radeon R7 Graphics] driver: radeon v: kernel 
  Device-2: NVIDIA GF108 [GeForce GT 620] driver: nvidia v: 340.108 
  Display: server: X.Org 1.20.13 driver: ati,nvidia,radeon 
  unloaded: fbdev,modesetting,nouveau,vesa resolution: 1920x1080~60Hz 
  OpenGL: renderer: GeForce GT 620/PCIe/SSE2 v: 4.4.0 NVIDIA 340.108 

[xenopeek]

If you don't want to use the GPU on your APU, disable it in your BIOS.

[Menard]

Yes but at first glance there is nothing for this

[djph]

If the hardware (BIOS / EFI) is reserving the RAM for your APU, there is nothing the OS can do about it.

[xenopeek]

Yes but at first glance there is nothing for this

Check your motherboard manual.

[Pjotr]

In all cases there should be a setting in the BIOS for that. Motherboard manuals can usually be found on the support section of the website of the motherboard manufacturer.

[Menard]

Check your motherboard manual.

I ve allready done this

The manual's BIOS section talks only about the Overclocking section of the Bios

[Menard]

Finally it is done, it was in the Bios, and not in the system

I have 2 settings
- Integrated Graphic Devices (IGD) > IGD or PEG
- Initiate Graphic Adapter > - Auto or - Disabled or - Dual Graphics

In fact by default when I insert the card and then power up and start the machine it switches to PEG but stays on Auto, and auto choses Dual graphics, so I had only to switch to "Disabled"

"Initiate graphic adapter" means nothing, so they are the problem

Beyond this there are some description of the same level ... and reading these descriptions (help) I believed that these settings affect only the BIOS graphic display because the write something as "set how the bios will display on start up"

And finally

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inxi -m
Memory:
  RAM: total: 7.79 GiB used: 2.00 GiB (25.7%) 
  RAM Report: 

The system (or the RAM ?) reserves only 0.21 GiB

Code: Select all

inxi -G
Graphics:
  Device-1: NVIDIA GF108 [GeForce GT 620] driver: nvidia v: 340.108 
  Display: x11 server: X.Org 1.20.13 driver: nvidia 
  unloaded: fbdev,modesetting,nouveau,vesa resolution: 1920x1080~60Hz 
  OpenGL: renderer: GeForce GT 620/PCIe/SSE2 v: 4.4.0 NVIDIA 340.108 

The result is not what expected though about the performances, it stays very below the A8 7600, I had read on the internet that for some cases, dual GPU with AMD APUs had resulted in aggrieved performances
And concerning power consumption it seems to be only 5 W more than without non integrated graphic adapter in instant measure