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Screen flickering when changing brightness #63

@quantumgolem

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@quantumgolem

This isn't really a bug report as I'm sure that this is an issue with my monitor, but I just wanted to confirm with others.

So I have a Dell U2415 monitor and when I change my brightness, from say 80% to 20%, with ddcctl, or any other DDC-based tool, this is what happens:

  1. The monitor brightness is at 80%. I enter the command to change it to 20%.
  2. The monitor momentarily flashes to 20% brightness.
  3. The monitor goes back to 80% brightness.
  4. The monitor fades from 80%→20% brightness, which is super pleasing.
  5. It stays at 20% brightness.

The problem is with the initial flash to 20%, which is really annoying. It's not that noticeable when making small steps, but with a larger jump it's really annoying.

It doesn't happen when changing contrast, only brightness. I assume it has to do with the fade which wasn't coded and tested very well in the monitor (although I fail to see how the manufacturer could let such an egregious issue slide!).

Does anyone else face this? Could you help me out by writing what monitor(s) you have and whether this happens to you? I want to get a monitor in the future that doesn't do this...

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