dsolaris's questions

This is a fresh 22.04 LTS install. X11 windowing. RTX 3060 graphics. I have enabled the NVIDIA drivers (510) and rebooted. After that certain colors seem to flicker. For example some of the colors on this wallpaper are subtly flickering as shown in the video. Please note, you will have to download the video as Google player reduces the size and hides the issue: https://drive.google.com/file/d/1UbkamSoF8PN6RBJWTN9tHMnEXxE2eArr/view?usp=sharing

Here is the actual wallpaper if you want to test on your system (please view in full screen): https://i.imgur.com/ghP14IL.jpg

It is NOT easy to detect(!) as it affects just certain tones. You don't notice it until you look closer. Easy to spot in low light. As you can see in the video, 90% of the colors are stable, just some are flickering.

• I am wondering if anyone with RTX 3060 had the same type of subtle flickering in the past releases?

• Did you found the solution to this problem?

I actually spent whole yesterday reading the archive and searching about the flicker problem. Everyone is referring to either screen going blank for a while or skipping areas. I didn't found similar problem referenced before which makes me believe it's a newer bug. To make things worse, it is not easy to detect!

Also to clear something out, the card is fine. It does not show any flickering on Windblows 10. In both cases it is set at 60 Hz refresh rate, 1920x1080, DP connection. Windoze video of the same image shows no flickering: https://drive.google.com/file/d/10VOCUd6zQ9oC7hBgfM7y_uyDnHSqyZZP/view?usp=sharing

UPDATE: I believe I found the source of the problem.

Monitors are Dell U2422H. From my research, many panels used in monitors are really 6bit per color channel. The 8bit color range is then somewhat faked and done through the monitor making the pixels flicker between different colors. And perhaps that's happening in my case. The problem is related to dithering mode.

As soon as i loaded my test image i noticed the gradient was no longer smooth but it contained some vertical artifacts. I should point out that the gamma is set to default in Ubuntu: xgamma gamma 1.0

I also have Windblows 10 and OSX and there the gradient is smooth. However in Ubuntu it is brighter and contains vertical artifacts. And each time i take a screenshot, test image becomes brighter. This is driving me crazy.

So here is a test image:

Here is a screenshot from Ubuntu. Look into the black area and notice how an extra gamma is applied, reducing the amount of black compared to original. Also notice vertical artifact:

Notice how bright the image becomes after a couple of screenshots (a screenshot of a screenshot of a screenshot to be exact):

The test image in the last example has become stupidly bright indicating there is another layer of gamma control present in the display settings that is just hidden from access and is added to the previous gamma which was present in a screenshot.

Please keep in mind before you mention i should change gamma, this is all happening at gamma 1.0.

I need to merge the contents of two folders sequentially into individual destinations. Here is what i have. A,B,C,D,E,F are individual files.

Folder 1:
A
B
C
...

Folder 2:
D
E
F
...

At the output i need merged files sequentially. So they should be merged like this:

Output:
AD
BE
CF
...

In other words, first file from the Folder 1 with the first file from the Folder 2. Second file from the Folder 1 with the second file from the Folder 2. In our case AD is consisting of the content of files A and D, BE consisting of files B and E, etc.

Both folders have the same number of files. Output can go anywhere. For the sake of simplicity let's call it Output folder and locate it in the same root as Folder 1 and 2.

Been looking for the solution for two days now. Yikes!