my two screens don't work

average user212212

6/24/24, 1:44 PM

I am a windows user who wants to try the linux ecosystem starting to use ubuntu but this gave me a big problem. Since I started the live two of my screens one fails (vga) and stays off but the operating system thinks it's on and working. I already tried changing xorg to wayland, trying to install the video drivers (it's an amd r9 380) and nothing. Once I enter recovery mode and since that mode places a very simple driver, apparently the two screens work but the image is cloned but I think that using the integrated kernel driver for amd fails fatally. I even ventured to download very old versions of ubuntu like Ubuntu 17.10 (I checked and the kernel is 4.13.0 generic) then I tried Ubuntu 18.4 and the two screens no longer work, of course and it doesn't work in the latest version of ubuntu. What could I try to do to solve this problem? Note: my graph gives video to an HDMI and a VGA monitor but with a DVI to VGA converter. And this fails both in live mode and normally installed

Solution: (not 100% for sure) is to modify the kernel by adding "amdgpu.dc=0" and that's it, my two screens work. The problem is that my GPU has HDMI, DisplayPort, DVI-D, DVI-I output and the problem is the DVI-I port which the operating system detects as DVI-D-1 and the DVI-D protocol does not support analog signal That's why it doesn't turn on but the OS detects it. With the solution disabling DC (Display Core) it seems to fix everything but I think that disabling this function can cause even more problems. I'm not a very advanced user so the problems it can cause with DC disabled I don't know

0 + 4

multiple-monitors

graphics

drivers

amd-graphics

mattia.b89

6/24/24, 2:20 PM

Very old version (17.10) was not a good idea; rather, did you try with latest LTS version? (22.04.2 LTS)

average user212212

6/24/24, 3:32 PM

Of course, I installed the newest version and it didn't work for me, try trying old versions and if it works, I tried up to 17.10 and both screens worked but when I jump to 18.4 it stops working until the latest version (22.04.2 LTS which also tried). I think it may be the kernel's fault due to a driver. I also tried other linux distributions such as manjaro, pop os, linux mint, fedora. Same problem

waltinator

6/24/24, 9:59 PM

Start by watching your booting system discover its hardware with the terminal command `sudo journalctl -b 0`. That will let you know which program handles the displays. Investigate that program.

average user212212

6/25/24, 2:35 AM

Replying to Waltinator. run the code and dump it into a text file, I put it in pastebin all that it throws. Link https://pastebin.com/7S74kTqP

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: my two screens don't work

Post an answer

Most people don’t grasp that asking a lot of questions unlocks learning and improves interpersonal bonding. In Alison’s studies, for example, though people could accurately recall how many questions had been asked in their conversations, they didn’t intuit the link between questions and liking. Across four studies, in which participants were engaged in conversations themselves or read transcripts of others’ conversations, people tended not to realize that question asking would influence—or had influenced—the level of amity between the conversationalists.