[chriswp]

Dear all,
I just upgrade from version 4 to 5, but something wrong happened in my display. When login all the thing in monitor was scrambled.


I tried to boot into recovery mode, then resume to normal mode everything is good. But when rebooted into normal mode the abnormal display was still there.
Please tell me what I have to do to fix this issue. 


This is my test command result:

Code:

inxi CPU: Dual Core AMD A4-9125 RADEON R3 4 COMPUTE CORES 2C+2G (-MCP-) speed/min/max: 1297/1300/2300 MHz Kernel: 5.4.0-42-generic x86_64 Up: 17m Mem: 1733.3/3815.0 MiB (45.4%) Storage: 931.51 GiB (0.9% used) Procs: 163 Shell: bash 5.0.17 inxi: 3.0.38

Code:

sudo lshw -c video   *-display UNCLAIMED            description: VGA compatible controller       product: Stoney [Radeon R2/R3/R4/R5 Graphics]       vendor: Advanced Micro Devices, Inc. [AMD/ATI]       physical id: 1       bus info: pci@0000:00:01.0       version: e2       width: 64 bits       clock: 33MHz       capabilities: pm pciexpress msi vga_controller bus_master cap_list       configuration: latency=0       resources: memory:e8000000-efffffff memory:f0000000-f07fffff ioport:f000(size=256) memory:feb00000-feb3ffff memory:c0000-dffff lsmod | grep amd edac_mce_amd          32768  0 amd_iommu_v2          20480  0 dmesg | grep -i amdgpu [    1.510877] [drm:amdgpu_init [amdgpu]] *ERROR* VGACON disables amdgpu kernel modesetting. [  11.598924] [drm:amdgpu_init [amdgpu]] *ERROR* VGACON disables amdgpu kernel modesetting.

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chris wp

[Şerban S.]

Hello!

VGACON disables amdgpu kernel modesetting.

There you have your answer!
There are two sets of drivers that are overlapped: the installed drivers and the kernel drivers.
It looks like Radeon is directly supported through kernel and you need to take a different approach on the installation process.
Read the manual for proprietary drivers and installing Linux without this kind of drivers. Actually, without any drivers since it is supported "out of the box".

A different approach.
If you manage to boot into the normal mode, go to "Additional Drivers" or use CLI:

Code:

/usr/bin/software-properties-gtk --open-tab=4

See what proprietary drivers are installed and uninstall them, or, if this is the case and you are sure you want to test, install the AMD drivers.
Maybe the kernel drivers are unappropriate for your specific version of video GPU.

Another choice is to uninstall any Radeon driver you find installed, using Synaptic Package Manager.

Good luck!

[lilred166]

try turning off screen compositing in window manager tweaks that worked for me