hi every one
i am programmer that works before 2011 with computer 14-16 hours every day
after unknown change , i can't see monitor at all because of eye strain .
i went to best optometrist and he say not found any problem in my eye .
i use 20-20-20 method , flux , low brightness , high brightness , contrast , several (10) stock monitor , new laptop , tv lcd , ............
until in 2017 i buy an stock monitor that is good ! nice ! but 17'' ....
when i connect laptop (lenovo y510p 4700mq intel hd 4600) to this stock monitor i haven't any eyestrain or headache .
now in Previous month i think work on new monitor that is bigger and newer ! for my work !
after reading threads of ledstrain.org and surfing the web find that Intel HD driver is the problem ....
It can be proved that this is so !!!!!!
and after several day and measurement open this thread ...
all of you can test and say the result !
with a phone-camera/ camera in professional mode of camera change the S parameter to 1/250 or 1/500 or 1/2500 and see the monitor behind it ... you can see very big and bad flicker in the screen
now in low brightness test above step and in high brightness test ... you can see in high S parameter even in high brightness you have flicker in your monitor if it's not full DC (fliker free)
now first backup graphics and intel hd drivers and then remove both from device manager
Notice that disconnect from internet before
Notice disable windows update
Notice that with this step only you can test only primery device monitor and canot connect to other monitor
now restart the pc and test step one and see the flicker in all S parameter of camera not see or is very very low
Now you can see in the device manager that display driver is Microsoft Basic Display Adapter
And notice that if you connect to internt or enable windows update , you can check device manager and see intel hd is back and with camer can see flicker is back !!!!
When intel hd software driver is present you can see flicker of monitor in low brightness or high brightness with camera in S parameter 1/500 or 1/1250 or high .
When microsoft basic display adapter is enable you canot see any flicker
In mode of active microsoft basic display adapter and with dithering.exe and flux(because monitor without intel hd driver canot set brightness ) your eye is comfortable , to test you shoud several days not work with other ways with monitor to see the effect
The problem with high probabilty is in the intel hd driver(flicker,dithering ,…) …. And can prove with above method
Please check and say your option