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I've started a bigsur installer. The time to find out what's made it work.

USB Prober app sees it: Hub (XHCI Root Hub SS Simulation) @ 0x15000000 with 6 ports Port 1: Status: 0x02a0 Change: 0x0000 STATUS(change): LowSpeed. Port 2: Status: 0x02a0 Change: 0x0000 STATUS(change): LowSpeed. Port 3: Status: 0x02a0 Change: 0x0000...

Begin to investigate the problem. Removed the HD5770 and switched on Intel Graphics HD4600. The problem remains. In system.log I see following: Jun 23 19:32:02 Romans-Mac-Pro kernel[0]: Wake reason: PXSX PEG0 PEGP PEG1 PEG2 Jun 23 19:32:07 Romans-Mac-Pro kernel[0]: RTC: PowerByCalendarDate...

Hi Lidiani, You solved this problem? I have the GA-Z87X-UD3H. I have the exact same problem.