you would have to have the kext in L/E or S/L/E so that it would be in cache for clover to patch it. running it from clover/kexts it will not get patched.
blurry image like your pic can also be caused by your screens edid not being read properly maybe you can inject it or dump it and add to clover custom edid
change the red 0x01 to 0x00
"AAPL00,DualLink",
Buffer (0x04)
{
0x01, 0x00, 0x00, 0x00
},
should look like this after then recompile and save
"AAPL00,DualLink",
Buffer (0x04)
{
0x00, 0x00, 0x00, 0x00
},
origin folder is unpatched asl files. if you are using a patched dsdt in clover/acpi/ patched then you use a dsdt editor to make the edit like maciasl. do a search for dual link when you find it then see if the variable is set to a number 1 or number zero. recompile it and resave it then test.
check clover boot log and see if clover is auto generating dual link then. also if your using a patched DSDT check to see if dualink is set in it and if so change it accordingly.
are you using emuvariable.efi clover driver and clover RC scripts? they might be needed for nvram to store your backlight settings. you can install both from clover installer options. you can also try clicking "SetIntelBacklight" or maxbackligt in clover device section