This fix applies if you have all of the below:
1. You have a laptop with screen having native resolution higher than 1280x800.
2. Your GPU is Intel HD3000 with DeviceID 0x0116. (Might also work with other DevIds).
3. You get "Transcript Offline : Buffer pool allocate [18100] failed" error with AppleIntelSNBGraphics.kext & then the display goes blank.
You need a DSDT fix in order to get the GPU working with full QE/CI.
Note: Some users are also mentioning greenish screen with artifacts. They can also try this & post if successful.
FIX begins here:
1. Download & install DSDTSE from here:
http://www.osx86.es/Archivos/DSDTSE.zip
2. Extract your DSDT using the option is DSDTSE.
3. In the "Locate" drop-box, click GFX0. If GFX0 is not present, use IGD0 instead but first see if GFX0 exists.
4. Add the below code properly :
Code:
Method (_DSM, 4, NotSerialized)
{
Store (Package (0x02)
{
"AAPL00,DualLink",
Buffer (0x04)
{
0x01, 0x00, 0x00, 0x00
}
}, Local0)
DTGP (Arg0, Arg1, Arg2, Arg3, RefOf (Local0))
Return (Local0)
}
just after these lines
Code:
Device (GFX0)
{
Name (_ADR, 0x00020000)
:
5. Click compile. DSDTSE would prompt you to save first, do so.
At this point, two things might happen. Either the DSDT would be compiled successfully or else there would be 1 error. If there are more than one errors, you've done something wrong.
The one error would be "DTGP not found". This can be fixed easily by adding the following code just after the first curly braces in the DSDT.
Code:
Method (DTGP, 5, NotSerialized)
{
If (LEqual (Arg0, Buffer (0x10)
{
/* 0000 */ 0xC6, 0xB7, 0xB5, 0xA0, 0x18, 0x13, 0x1C, 0x44,
/* 0008 */ 0xB0, 0xC9, 0xFE, 0x69, 0x5E, 0xAF, 0x94, 0x9B
}))
{
If (LEqual (Arg1, One))
{
If (LEqual (Arg2, Zero))
{
Store (Buffer (One)
{
0x03
}, Arg4)
Return (One)
}
If (LEqual (Arg2, One))
{
Return (One)
}
}
}
Store (Buffer (One)
{
0x00
}, Arg4)
Return (Zero)
}
Add the above code just after
Code:
DefinitionBlock ("./dsdt.aml", "DSDT", 2, "Sony", "VAIO", 0x20080725)
{
Now compile the DSDT & drag the DSDT.aml file to the desktop. Run Multibeast & check "USER DSDT" & MacbookPro 8,1 is Customization>System Definitions.
After Multibeast finishes, Reboot.
You will still get "Transcript Offline : Buffer pool allocate [18100] failed" error but this time the display should come up with Full QE/CI.
Please post how this goes.
All of the credit goes to member "exoteg" to figure it out.
http://www.tonymacx86.com/viewtopic.php ... 7&start=90
Original creditor is "CharredPC" of InsanelyMac forums.
http://www.insanelymac.com/forum/index. ... try1362685
Why this works ?
As explained by "CharredPC",
The reason why this works is easy. Higher-resolution LCD's require two data lines to handle the increased information. With my original 1280x800 LCD, OSX worked perfectly. Once I upgraded it to a 1440x900, OSX showed a black screen. Just like in a DVI connector, to get better resolutions you need... you got it- Dual Link capability. Windows and some older OSX drivers + Natit automatically enable Dual link, but the latest Leopard stock kexts do not. Without this flag telling OSX to use Dual Link, your backlight comes on, but the video data isn't getting through. Once this fix is added, OSX knows to send a dual stream of data, and the image comes through.
.
