Kaby Lake banding issue (tried everything)

[Pityke]

I read all threads and tried everything but I'm just not able to solve the banding/colour depth issue.

Tried the following methods but none of them helped:

• Spoofing Skylake graphics with Clover Device/Properties. I tried every Skylake device-id and It solved the banding but I always ended up with 7mb VRAM. I tried to add the framebuffer mem patches to solve this but it caused bootloop.
• Spoofing Skylake from SSDT=> Same result
• Sniki mentioned somewhere that we don't need to spoof Skylake anymore, we can use the igfxfcmsfbs boot flag. The description of this flag is a little bit confusing so I tried "igfxfcmsfbs", "igfxfcmsfbs=-1" and "igfxfcmsfbs=0x010203".
• Tried a few different EDID patch (with checksum calculation), played with Byte 20 only, Macbook Air EDID injection, etc.
• Booting with and without -disablegfxfirmware (combined with all igfxfcmsfbs variations)

Any idea?

 

[Shinji3rd]

Too bad no one was able to answer this. I also don’t know how to properly use igfxfcmsfbs argument