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jwagnervaz / DUAL-CPU-ZX-DU99D4-V1.31-BIOSMOD

BIOSMOD for DUAL CPU ZX-DU99D4 V1.31
MIT License
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Enable Sleep Mode #1

Closed thebao1992 closed 10 months ago

thebao1992 commented 1 year ago

Enable Sleep Mode (S3) for DU99D4 v1.31 When i press sleep button in Windows, mainboard goes to sleep but when i wake it up, it just show B7 code then can't resume. Can you enable this feature inside BIOS?

jwagnervaz commented 11 months ago

These chineses Motherboards have sleep broken, it could be drivers or hardware.

But its one of my goals to find out a way to fix it or have at least a awnser.

Thanks for posting. Share here, your pbc version and your setup configs.

thebao1992 commented 11 months ago

1: After take a look at this motherboard, i saw it used 5vol dc-dc buck converter for top DDR4 bank (1.2v), bottom DDR4 slot use 12vol from ATX 24pin.

On normal motherboard use both 5vol and and 5vsb to power RAM. (5v_dual)

I desolded 2 choke, which is connected to 12v and 5v line, and connect to 5vsb line. Now my RAM power always use 5VSB. Hardware mod is done.

2: I need a bios enable S3 sleep stage. I modded BIOS too but it did not work.

So, next time i need to find S3_STAGE and S5_SLP signal then use it to connect to EN pin (RT8120A DC-DC converter DDR 1.2v power)

jwagnervaz commented 11 months ago

Its seems Sleep works on Bios level. But when pc comes to sleep level, the 1.2v is cut down, so ram lost they power. And u cant come back from sleep.