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I noticed this problem with the NVIDIA proprietary driver on each and every upgrade of Ubuntu versions. Can I remove the prop driver and manage with the generic open source driver?

  • Related Meta page: meta.askubuntu.com/q/17983/250300 – Melebius Jun 12 '18 at 6:48
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    Here is an example Ask a question and then answer it yourself. – Fabby Jun 12 '18 at 20:32
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    I posted your solution as a community-wiki answer below. Feel free to repost it as your own answer to get the reputation related to it. Then @-mention me in a comment to this question, so I can delete the community-wiki answer. @WinEunuuchs2Unix I finally found a way to phrase the beginning of the question as an actual question, so it’s converted to Q&A now. – Melebius Jun 13 '18 at 8:22
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This solution was initially posted by the OP as a part of the question.

To remove the NVIDIA drivers completely

sudo apt purge ^nvidia

Some of the additional components which may raise issue need to be removed

sudo apt purge bumblebee vdpauinfo vulkan-utils 

The removed and the pending dependencies can be fixed by installing the Ubuntu Desktop

sudo apt install ubuntu-desktop

In some versions of Ubuntu the xorg config will create some issue so it needs to be removed. If not found it will be well and good.

sudo rm /etc/X11/xorg.conf

Now make nouveau the default driver

echo 'nouveau' | sudo tee -a /etc/modules

If nouveau was blacklisted it is advisable to remove the blacklist

sudo rm /etc/modprobe.d/blacklist-nouveau.conf

This the last and the final step of the process

sudo update-initramfs -k all -u

Reboot the computer and check the brightness controls and the video playback.

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    OP has now posted their the answer themselves. – TRiG Jun 19 '18 at 22:33
  • @TRiG And removed again… :-( – Melebius Jun 12 '19 at 9:55
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    Odd. Very odd. I wonder why. – TRiG Jun 12 '19 at 9:57

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