Hi guys.
I’m using portable Manjaro between two machines.
Machine one: AMD Vega 8 Integrated Graphics
Machine two: No Integrated Graphics and Nvidia GTX 760
When I installed Nvidia nonfree drivers, there’s no way to boot into desktop on machine one.
Can I disable the Nvidia Graphics Driver so that I can use the system on machine one?
I know that is a wired demand, but if you have the solution, please give me a hand. Thanks!
do both machines have secure boot disabled?
are they both running in uefi or bios mode?
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I’m not sure the second machine’s security boot is disabled. Because its BIOS is so limited.
Both of the machines are running in UEFI mode.
Thank you for your reply!
Hello @Kare_Udon 
Not at all. It is a configuration. Just a hint:
You can create prioritized xorg configs at /etc/X11/xorg.conf.d/. So lets say:
91-nvidia.conf92-amd.conf
Now when loading xorg, it will first use 92-nvidia.conf, if the device is not there, then it checks 91-amd.conf. So the number is the key.
At bare minimum it could look like:
File: 92-nvidia.conf
Section "Device"
Identifier "nvidia card"
Driver "nvidia"
#BusID "PCI:1:0:0"
EndSection
Section "Screen"
Identifier "Screen0"
Device "nvidia card"
EndSection
File: 91-amd.conf
Section "Device"
Identifier "amd card"
Driver "amdgpu" # or modesetting
#BusID "PCI:0:1:0"
EndSection
Section "Screen"
Identifier "Screen0"
Device "amd card"
EndSection
Also rename the 90-mhwd.conf to 90-mhwd.conf.backup to deactivate it if there.
1 Like
Hi! Wonderful reply!
After adding these settings, I can successfully boot into machine two, but still can not boot into desktop environment on machine one.
The graphic card info of machine one:
04:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Renoir (rev ce) (prog-if 00 [VGA controller])
Subsystem: Lenovo Device 3813
Flags: bus master, fast devsel, latency 0, IRQ 39, IOMMU group 5
Memory at b0000000 (64-bit, prefetchable) [size=256M]
Memory at c0000000 (64-bit, prefetchable) [size=2M]
I/O ports at 1000 [size=256]
Memory at c0500000 (32-bit, non-prefetchable) [size=512K]
Expansion ROM at 000c0000 [virtual] [disabled] [size=128K]
Capabilities: [48] Vendor Specific Information: Len=08 <?>
Capabilities: [50] Power Management version 3
Capabilities: [64] Express Legacy Endpoint, MSI 00
Capabilities: [a0] MSI: Enable- Count=1/4 Maskable- 64bit+
Capabilities: [c0] MSI-X: Enable+ Count=4 Masked-
Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>
Capabilities: [270] Secondary PCI Express
Capabilities: [2b0] Address Translation Service (ATS)
Capabilities: [2c0] Page Request Interface (PRI)
Capabilities: [2d0] Process Address Space ID (PASID)
Capabilities: [400] Data Link Feature <?>
Capabilities: [410] Physical Layer 16.0 GT/s <?>
Capabilities: [440] Lane Margining at the Receiver <?>
Kernel driver in use: amdgpu
Kernel modules: amdgpu
I have tried to change the setting ‘Driver’ to ‘amdgpu’ and ‘linux’ but none of them works.
Maybe I was wrong about the numbers… switch them:
91-nvidia.conf → 92-nvidia.conf
92-amd.conf - 91-amd.conf
Also rename the 90-mhwd.conf to 90-mhwd.conf.backup to deactivate it.
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I disabled 90-mhwd.conf,
adjust the numbers and change the ‘Driver’ setting to ‘amdgpu’,
and it finally worked!
Thank you so much for your help!
Great
I switched the solution tag and corrected my advice accordingly. Is that correct so far? I mean is it the way you managed it?
Some bad news 
When I set 91-amd.conf and 92-nvidia.conf, machine one (AMD) works but machine two (Nvidia) not.
When it is 91-nvidia.conf and 92-amd.conf, machine two works (but the desktop looks a little wired, not as smooth as before, but graphic card works fine) and machine one do not.
So I think it is a solution but not the perfect one 
By the way, I am using KDE Plasma.
Hm… it was while since I did it…
maybe both needs the same number?
That are the system configs: /usr/share/X11/xorg.conf.d/. Don’t change them. Add a OutputClass here: /etc/X11/xorg.conf.d/.
Maybe an OutputClass is just enough?
File: 10-nvidia.conf
Section "OutputClass"
Identifier "nvidia"
MatchDriver "nvidia"
Driver "nvidia"
Option "AllowEmptyInitialConfiguration"
ModulePath "/usr/lib/nvidia/xorg"
ModulePath "/usr/lib/xorg/modules"
EndSection
File: 10-amd.conf
Section "OutputClass"
Identifier "AMDgpu"
MatchDriver "amdgpu"
Driver "amdgpu"
EndSection
Just test it. 10 is here then high priority.
3 Likes
Nice, it is the best solution!
Both of the machines can boot into Desktop environment.
Thank you so much 
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