Eyestrain solved after 6 years and multiple panels - LG 32gk850g

andc Anyway it's hard for me to believe that every panel with over 8ms response time is 8 bit since almost no notebook panel is faster than this as I browse Notebookcheck reviews.

I have spent a lot of time looking at panel specs on panelook.com and nearly all laptop panels I have seen are not true 8 bit panels but rather listed as 6+2 meaning 6 bits plus using dithering to get 2 more bits for a total of 8. For example here is the HD panel in a 2018 X1 Carbon http://www.panelook.com/B140HAN03.1_AUO_14.0_LCM_parameter_32138.html It just says "6+FRC" but many say explicitly "6+2 FRC"

Even the fancy HDR panel on the X1 Carbon 6th gen seems to not really be 12 bit HDR as it is advertised but rather 8+4. IF dithering is an issue then this is super relevant because most laptops are only 6 bit natively but being told to show 8-bits. But since laptop panels are "dumb" and require the gpu to tell them to dither I hope that means we can somehow force the output to the native color depth so the dithering doesn't happen.

But as usual it's confusing because IF dithering was the root cause it would seem logical to think an older 262k 6bit TN panel would be strain free and in my experience it is not...but to be fair I was unable to find one without PWM to avoid that variable. I don't know if that means those panels are still capable of dithering above 6 bits or if something else is going on.

andc Unfortunately that site doesnt list PWM use as its info comes from manufacturers and they don't want to share that with anyone it seems. "Flickering" is a broad term and PWM backlight flickering is entirely different than dithering/FRC, but who knows if the results with regard to strain is the same or not. My personal experience has been that PWM is irrelevant since using known PWM free panels causes the same amount of strain as ones with visible PWM. It surely can't be GOOD for us but I've never seen someone solve their strain by simply removing PWM.

andc For me at least it doesn't matter if they are PWM free and 8-bit. I have seen such panels at shops and they still strained me. The Dell XPS 15 is an example. That's what makes the dithering thing confusing because if that IS a major factor then why would it be happening on a true 8-bit panel? Does that mean dithering isn't a cause of strain? Does that mean it's trying to dither even higher to 10-bit etc?

JTL We are on the same page I think...I may have just expressed it wrongly. The laptop panel doesn't have built in dithering instructions or blue light/contrast/brightness whatever etc like a desktop monitor can so I called that a "dumb panel". As I understand it the panel's pixels have to "dither" to get the "super awesome vibrant" colors and thats what I meant by saying the gpu is making the panel dither. I understood the gpu is making it happen.

hpst I was just pointing out how even outside of a running OS with just a greyscale BIOS screen and the newer Nvidia cards, it's dithering.

JTL

What does that mean? Why in the world would a text only, pre OS utility be dithered? Does that mean its just hardwired into the gpu and whenever a computer is on its dithering regardless of what is displayed? I had some hope it was dithering because instructions in the OS/drivers were telling it to which would mean it might be possible to turn off. If its in firmware before the OS and drivers even get loaded how could we even affect it?

JTL

This could be huge as an easy DIY test to see if dithering is or isn't an obvious problem. Do you have any more info on what gpus? There isn't any detail. I see there are linux instructions there which was a nice surprise as I thought "yeah it probably only works on Windows". If this would work on AMD Ryzen/Vega laptops etc it would be an easy test as there are a couple at Best Buy I could try in store if this Catalyst Center thing is normally installed...but they have locked down internet so no installing new stuff there.

Do you know if you can enable 10-bit monitor support, thus turning dithering off, on a Linux system with an AMD GPU/APU somehow? I could also live boot linux in a shop and try that as well. Worst case I would buy an AMD laptop and just return it if it didn't work...but I guess I need to know what GPUs/APUs this works for first. Does Nvidia have a similar process since there are a lot more Nvidia models out there to test?

hpst I do plan to test this after I get the same/similar laptop as @deepflame after the capture card. Just a few more things to sort out with my desktop before I order it, nothing to do with you.

I'll write you a summery email tomorrow.

JTL I guess I need to try to get to Best Buy soon and see if this Catalyst Control Center is installed on any of their AMD laptops and try these instructions. Does the 32bit registry entry mean these are old instructions? There are no dates on the article/entry.