I have a problem with my laptop Dell Inspiron 3593 (with InnoLux N156HGA-EAB built-in screen). It gives me eyestrain (dry eyes feeling) within a few minutes when I start using it. I can see that the screen is pulsating slightly (it's almost invisible). It doesn't matter whether I use it in daylight, artifical light, both of them or in darkness. Also whether it's connected to AC or not.
It happened since I unboxed it. First it was completely unusable, giving me more eyestrain, headache and nausea. I tried changing it's settings, but it didn't work.
After a few months I got a job which requires using it, so I didn't have time to send it to warranty repair (and they may claim that they don't see any problem), so I decided to modify the hardware myself. I soldered an electrolytic capacitor in parallel with backlight LEDs - it helped a lot, but it's still worse than a standard laptop screen. I thought, maybe that capacitor isn't enough to stabilize LEDs current? I tried to add an inductor in series with LEDs, but I broke something (it requires precise soldering and avoiding short circuits) and backlight went out. I found a temporary solution - bought a small regulated inverter module, soldered it's input to USB plug and it's output to LEDs (with capacitor and inductor forming LC filter). I feel it's similar or slightly better quality to previous solution (when I soldered a capacitor to LEDs powered by original inverter).
However, there must be some flickering coming also from LCD. I tried different solutions, but it didn't help, i.e.:
-changing screen frequency and definition (current is 60 Hz, 1920x1080)
-changing /etc/default/grub: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i915.modeset=0 i915.enable_dc=0 i915.enable_rc6=0 i915.enable_fbc=0 i915.panel_use_ssc=0 i915.alpha_support=0 i915.enable_ips=0 i915.enable_dpcd_backlight=0" (this is how it currently looks like - previously I tried also GRUB_CMDLINE_LINUX_DEFAULT="quiet splash
i915.enable_psr=0", but it also didn't help)
-changing desktop to KDE (it installed KDE Plasma)
If I remind something else what I tried, I will write.
About my experience with other devices
Previously I had Asus X55VD laptop with preinstalled Windows. On Windows it worked rather good. Except that in the evening I got a little eyestrain from backlight PWM, but only after a few hours of using, not a few minutes. On Ubuntu it was unusable (similar to Dell Inspiron 3593 before that hardware modification), on other Linux distros too, only Mint was slightly better. When fast scrolling some document on Ubuntu, I could see diagonal tearing.
Other computers (laptops and desktops) don't cause such problems for me - I used many different of them, with Windows or Linux.
Last year I bought Elitecho smart LED bulb - it caused the same symptoms (especially dry eyes) when dimmed or with mixed color temperature (it has sets of warm and cool white LEDs which can be dimmed independently). Here I also soldered some capacitors - and it also helped much, but not enough.
Could you please help me with my Dell? What should I modify in settings/software? And what screen would you recommend for replacement (with properly powered backlight and correct LCD panel, if it also matters)?