I have a Thinkpad T440 laptop with Intel HD4400 (I had Ubuntu 20.04, but now I'm using 16.04) that gives me eyestrain and headaches and leaves me with discomfort and even a strange feeling in the chest.
I turned off EFI in the BIOS and that seems to have made the screen more comfortable to look at. But I still get discomfort/eyestrain/headaches if I use it for more than an hour or two. I blacklisted the i915 driver (couldn't turn the screen brightness down), but the image on the screen did seem more stable, but still uncomfortable. When I turned off graphical mode in GRUB it was uncomfortable to look at - even more uncomfortable than using i915. When I go into the BIOS, the screen is also slightly hard to focus on.
When I connected the laptop to a CCFL monitor that has never given me eyestrain in the past, it is also uncomfortable to look at.
The laptop has a 2020 version of the BIOS. If it were possible to downgrade the BIOS to a 2013 version, could this fix the problem I'm having?
Otherwise, what else can I try to fix this problem? The problem appears to be present in the BIOS screen too - can the BIOS screen be affected by the Intel graphics drivers or is it totally separate to them?
Is the Intel iGPU dithering even in the BIOS? Could using Windows with ditherig.exe be a solution?
I tried using Windows 10 with the Microsoft display driver but I couldn't adjust the brightness and it gave me nausea. I haven't felt nausea like that since I used a Surface 3. I could try reinstalling and use the Intel drivers with ditherig.
Could someone please help me?