• Hardware
  • Two Different Display Link Adapters

I have a Pluggable USB DisplayLink adapter (hdmi) and it is running the same driver version as my Dell Docking station with DisplayLink over hdmi.

The Pluggable states it runs at 59hz and a light detector shows it as 243 LUX

The Dell Docking states it runs at 60hz and a light detector shows it as 304 LUX

I get dizzy with the Pluggable and am fine with the Docking Station. Could 1Hz and 60 LUX make that much of difference?

    Dizzy there's also the chance that the pluggable adapter uses a more """advanced""" chip for either its HDMI controller or decompression module and adds stuff like noise reduction, oversharpening, or additional dithering to the image.

    since DisplayLink is lossy compression, not lossless, there's many different ways that stream can be decompressed… possibly Pluggable doesn't even "know about the problem" themselves -- but instead whichever other 3rd-party manufacturer made the hardware decoding chip they put inside their adapter.

    if that's the case, it's pretty likely that a chip decoding lossy data will try to tack on some mystery "image enhancement" tech to "compensate" for the compression…

    the amount of modification to the image, what types of processing it might use, and whether those types of processing mess with your vision, can totally change depending on the hardware within each adapter

    so it's really just trying different ones until you get lucky

    for example. recently have been looking at data sheets for HDMI and LCD controllers as early as the mid-2000s(!) and there are so many mentions of everything from "temporal noise reduction", tons of different dithering methods, "local dyamic contrast enhancement", the list goes on.

    (my current understanding is that a lot of this stuff was designed for TVs, then basically gets reused for every other type of display tech because "that's the most cost effective", even if it's totally unfit for e.g. information-dense UI content and makes text look terrible)

    so it makes sense why each adapter outputs a slightly different image

    -

    the only way to figure out exactly why would be to get a lossless capture card, take a direct frame grab from the capture card of each adapter displaying the same exact desktop UI, and compare the colors of each pixel

      dev