I always wondered about the BIOS version-related graphics corruption on our E6x30 laptops, especially as, in the case of the E6230, the video OROM carries the same version 2.1.3.7 between BIOS A11 and latest version A19. So, I upgraded to A19 and re-patched A19's raw DSDT table. The E6230 boots without any graphics corruption and the laptop works as great as before and without any graphics issues so far. The well-known graphics corruption is only seen on closing screen when restarting or shutting down OS X/macOS.
Pci Ven 8086 Dev 1e20 Latest Version
2ff7e9595c
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