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rated 0 times [  1] [ 0]  / answers: 1 / hits: 522  / 3 Years ago, wed, july 21, 2021, 7:24:33

Is there some general flowchart-like procedure or tutorial on how to troubleshoot graphical driver problems with Ubuntu?



I am in a situation where I have a PC which I do not know anything about, I made a fresh install of Ubuntu, opened Unity and the screen started to flicker, decomposed itself into small tiles and became completely unusable.



I would like to learn how to troubleshoot such a situation. That is something like a detailed explanation on how to:




  1. Make sure the problem is the driver and not something else

  2. Learn what hardware I am using

  3. Based on this information, reinstall the correct driver



I also do not know much about the world of graphic hardware companies and graphic cards in general, so if such a knowledge is important, please could you add some directions to find the necessary information?



As suggested in the two answers, I ran:



lspci | grep VGA


and found out that I have an Nvidia hardware and nouveau driver. I tried googling the two and found this guide.



I turned off the GUI using ctrl+alt+F2, logged in and followed the instructions in the "Installation from console" section of the tutorial. I then rebooted and the problem seems to be solved.


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 Answers
5

You first need root permissions. Some of the information are only accessible with the root account.



It varies from card to card but the most important logs are dmesg and /var/log/Xorg.0.log (I don't know which logfile will use mir, /var/log/mir/mir.0.log?). Another tool that will be critical to identify the problem is lspci lsmod and modinfo:



sudo lspci -nnk | grep -A5 VGA

03:00.0 VGA compatible controller [0300]: Advanced Micro Devices [AMD] nee ATI RV515 [Radeon X1300/X1550] [1002:7146]

    Subsystem: VISIONTEK Device [1545:2352]

    Kernel driver in use: radeon


This will tell me what driver/module I'm using, with modinfo I could tell the details of the module, and lsmod will inform me if any other driver is loaded.



That is the basic that will allow you to search for more information and point where the problem might be.



Useful resources:




[#28428] Thursday, July 22, 2021, 3 Years  [reply] [flag answer]
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