KB Issue
Lenovo G770 has the graphics dedicated memory set to 64 MB in the BIOS. To change this setting, you will need a MOD or BIOS HACK.
Issue Details
The Lenovo G770 BIOS comes default locked, which removes all the consumer's ability to change settings within the BIOS, to fit their needs. Such things as the Dedicated Memory for the Graphics Card, as well as other much-needed settings.
Recreate Issue
Lenovo G770 comes with the BIOS locked; the only way to unlock it is to run a MOD against the BIOS. (Described in the Resolve Section below) This will then allow the consumer to change the dedicated graphics memory.
Resolve Issue
First, you have to run a MOD against your BIOS.
To do this, please follow the information provided here thoroughly, and do not miss any steps, as we cannot be held responsible for any damage done to your computer.
Download the BIOS from here
LENOVO-40CN07WW V3.06 UlkMenus«
Launch the .exe
Copy
Search Site
Search Google
file, and extract the .rom
Copy
Search Site
Search Google
file.
Then follow the information below.
Format USB Drive to FAT32
Rename the downloadable file
LENOVO-40CN07WW V3.06 UlkMenus.rom
to
PIWG1.bin
Copy the .bin file to your USB FAT32 drive.
Follow instruction below.
(The first part here is from my own personal experience with running the MOD on my BIOS.
Read it first, then read the numbered list below, and follow the instructions that work for you... GOOD LUCK.
[Own My BIOS]
In the last step, once you cut the system back on, you do not have to hold down the FN+B key the entire time.
I never did get a first Beep. It took about 2 minutes for it to start beeping.
Once the beeping starts, give it about 4 straight beeps.
Unplug the cable, and pull the battery out.
Count to 5
Put the battery back in, and boot the system.
Press F2 to enter the BIOS, and you should have everything you need.
  1. Turn off the laptop
  2. Unplug the power cord.
  3. insert the flash drive
  4. press and hold the Fn-B key combination
  5. while holding Fn-B, plug in the power cord
  6. still holding Fn-B, press the Power buttonThe computer will spin up the fan, but the screen will remain black. If it finds the appropriate file, it'll beep again, read it in, and start flashing the BIOS. Once it's completed flashing the BIOS, It will continuously beep, the power button will not respond, neither will any key combinations. Unplug the laptop from its power source, then remove the battery to power it down. Put the battery back in, press the power button and it SHOULD power up and run without issue.
To change the dedicated memory for your graphics card, perform the following steps.
  1. Get into BIOS [F2]
  2. Go to [Advance]
  3. Then to [Video Graphics]
  4. Then go [Internal Graphics]
  5. Choose the 4th one down [IGD - DVMT Pre-Allocated] = 128 (Or higher, depending on your card)
  6. Save your settings before you exit the BIOS.