Lenovo 15ARH05 LCD whitelist removal request (Yes. display whitelists....)

[techcraze]

Long story short. i am building a fully custom car radio. and want to use a extremely bright LCD.

sadly the DGPU seems to be nonfunctional after i fixed the bios (fried voltage controller). so the Original HDMI port does not work.

you can use a EDP TO HDMI adapter to add a HDMI port as replacement to the onboard EDP LCD connector,

HOWEVER it turns out. lenovo enforces a LCD whitelist.

this means you cannot upgrade the LCD despite matching EDP specs and voltages.

If i connect a new screen directly to the system. only static shows. despite matching EDP 1.4 spec and Voltages


if i use a "EDP TO HDMI" adapter board. the screen will not work. unless you sleep/wake windows. then it does work.



this means there is a LCD whitelist. because on boot. EDP handshake occours. bios says NO. and blocks it.

in windows during sleep/wake. EDP handshake occours. but BIOS does not enforce whitelist in that moment.


I am wondering. can Bios LCD whitelist be removed Entirely? can the bios just be set to output 1080@60hz? (or 4k60hz. both work for me as my panel accepts both.)

if it cannot be removed/disabled. is there a way to replace a existing LCD for a different LCD model so it does work?

I have attached the bios flash that boots on this specific machine. thank you in advance for you help!

[techcraze]

if no modification is possible.

what are ALL the supported/whitelisted LCD's in my bios?

i can maybe try to spoof the EDID of my HDMI display. since both are BOE panels. just diff model types.

[techcraze]

Seems like something went wrong on my first post and the bios did not get posted on my post.

here is the original bios that works after reflashing.