AppleIntelFramebufferAzul.kext

A couple of days ago I blogged about the discovery of fBacklightFrequency and fBacklightMax. Today I like to add four more. This time; fStolenMemorySize, fFramebufferMemorySize, fCursorBytes and the amount of VRAM:

00 00 16 0A 00 03 03 03 00 00 00 04 00 00 00 01
00 00 F0 00 00 00 00 40 D9 0A 00 00 D9 0A 00 00
00 00 00 00 00 00 00 00 00 00 10 00 02 00 00 00
30 00 00 00 01 05 12 00 04 00 00 00 04 00 00 00
02 04 12 00 00 08 00 00 82 00 00 00 FF 00 01 00
01 00 00 00 40 00 00 00 04 00 00 00 00 00 07 00
04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00

Note: The last 24 bytes are the same for all data sets.

fStolenMemorySize: 00 00 00 04 = 0x4000000 = 64 MB
fFramebufferMemorySize: 00 00 00 01 = 0x1000000 = 16 MB
fCursorBytes: 00 00 F0 00 = 0xF00000 = 15728640 / 10 = 1572864
VRAM: 00 00 00 40 = 1024 MB
connector-type: There are five different connector types, being:

02 00 00 00 – LVDS
04 00 00 00 – DVI
00 04 00 00 – DP
00 08 00 00 – HDMI
00 0C 00 00 – Thunderbolt?

Note: Lowering fStolenMemorySize triggered the following error:

Assertion failed: minStolenSize <= fStolenMemorySize

Here is a handy table to convert values without the calculator:

00 00 00 01 = 0x01000000 = 16 MB
00 00 00 02 = 0x02000000 = 32 MB
00 00 00 04 = 0x04000000 = 64 MB
00 00 00 06 = 0x06000000 = 96 MB
00 00 00 08 = 0x08000000 = 128 MB
00 00 00 10 = 0x10000000 = 256 MB
00 00 00 18 = 0x18000000 = 384 MB
00 00 00 20 = 0x20000000 = 512 MB
00 00 00 30 = 0x30000000 = 768 MB
00 00 00 40 = 0x40000000 = 1024 MB
00 00 00 60 = 0x60000000 = 1536 MB
00 00 00 80 = 0x80000000 = 2048 MB

This information should come in handy for people who want to experiment with frame buffer data 😉

Update: connector-type data values added.

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