Upgrade from Ubuntu 18.04 to 20.04 caused scrambled screen

pizzipie · 10-08-2020, 08:30 PM

I upgraded from Ubuntu 18.04.5 to Ubuntu 20.04. Upon new re-boot screen is unusable as it is scrambled. See attachment.

I don't have a clue as to how to fix this. I can't use the machine to fix itself as I can't access the control center.

I think there is a 'ctrl xx' to get out of the x-window and access the terminal but then what?

Do I need a different driver to fix this?

Quote:

Thu 08 Oct 2020 03:28:39 PM PDT

System: Host: rick-MS-7C02 Kernel: 5.4.0-48-generic x86_64
bits: 64 gcc: 7.5.0
Desktop: MATE 1.20.1 (Gtk 3.22.30-1ubuntu4) info: mate-panel dm: lightdm
Distro: Ubuntu 18.04.5 LTS
------------------------------------------

Machine: Device: desktop System: Micro-Star product: MS-7C02 v: 1.0 serial: N/A
Mobo: Micro-Star model: B450 TOMAHAWK MAX (MS-7C02) v: 1.0 serial: K717358541
UEFI [Legacy]: American Megatrends v: 3.70 date: 06/09/2020
------------------------------------------

Graphics: Card: Advanced Micro Devices [AMD/ATI] Picasso
bus-ID: 27:00.0 chip-ID: 1002:15d8
Display Server: X.Org 1.20.8
drivers: ati,amdgpu (unloaded: modesetting,fbdev,vesa)
Resolution: 1680x1050@59.88hz
OpenGL: renderer: AMD RAVEN (DRM 3.35.0, 5.4.0-48-generic, LLVM 10.0.0)
version: 4.6 Mesa 20.0.8 Direct Render: Yes

sgosnell · 10-08-2020, 09:01 PM

What you posted says you're still on 18.04, but it's not obvious where that info came from. Have you rebooted the machine again? Ctrl-alt-Fx, where x is any number between 1 and 6, will get you to a terminal.

pizzipie · 10-09-2020, 11:56 AM

Sorry sgosnell, That info came from Ubunbtu 18.04.5 (inxi -options) when it was operating prior to my upgrading to 20.04.

I was then able to change the screen resolution to 1680x1050@59.88hz with no problem and it worked fine.

As soon as I installed Ubuntu 20.04 the scrambled screen started. As a matter of history I Installed Ubuntu 20.04 from flashdrive alongside Ubuntu 18.04 and the same scrambling happened. At that time I just gave up and went back and re-installed Ubuntu 18.04. I'm now trying to get this resolved once and for all.

By the way the AMD Ryzen 5 3400G DOES support Linux. (so the docs say). I forgot to include the CPU info before.

Quote:

CPU: Quad core AMD Ryzen 5 3400G with Radeon Vega Graphics (-MT-MCP-)
arch: Zen rev.1 cache: 2048 KB

flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm) bmips: 29601
clock speeds: max: 3034 MHz 1: 1367 MHz 2: 2296 MHz 3: 1364 MHz
4: 1393 MHz 5: 1368 MHz 6: 3034 MHz 7: 1380 MHz 8: 2434 MHz

It would seem to me that if the graphics works on 18.04 it should work on 20.04.

sgosnell · 10-09-2020, 03:49 PM

Have you tried changing the display resolution in 20.04? Also consider the refresh rate. Those can sometimes make a difference. Other than that, I'm at a loss. I know little about Ubuntu.

pizzipie · 10-10-2020, 06:00 PM

I gave up and re-installed Ubuntu 20.04. I fooled around with the resolutions and settled on 1280x800. It will not accept 1680x1050, 1440x900.

Who knows I've waste enough time on this.

Thanks for your help, R