Disable ULPS to fix slow bootup black screen issues in Windows 10

If your tablet or laptop has been setted up AMD Crossfire multiple GPU Graphics and upgraded to Windows 10, such as my Notebook has an AMD A8-3510MX APU with Radeon HD Graphics, the crossfire configurations known as Ultra Low Power State (ULPS) can lower the frequencies and voltages of 2nd cards for saving power. But the ULPS also increases performance and some crossfire instability, as well as may causes the slow black screen booting up problem. Any way to get rid of that?

It seems to be a bug with Catalyst Drivers. Booting up Windows 10 system which are running on AMD CrossfireX graphics cards will get a black screen and sometimes take up to about 5 minutes, then continue to the Windows login screen. Making a restart process doesn’t run into such issues. You could try the temporary workaround to disable the function.
* First you need to log in as an administrator account.
* Press Win + R from your keyboar, input regedit.exe and click OK button. You can also type regedit to Cortana app or search box and select the top one from results.
* At the top of Registry Editor, clcik Edit > Find from the menu (or press and hold Ctrl + F keys), input Enable ULPS into the Find what box, click Find Next button to search for a instance.
* Ddouble click the EnableULPS to edit it, and change its value data from 1 to 0.
* Then repeat the above way to find the instance one by one. Set the default value of 1 to 0 when Enable ULPS instance is found, until there are no more by pressing Find Next.
* Finally reboot the system to apply all changes.
* However, once you have installed new driver or uninstall it, the related settings will be returned to default value 1. So you have to modify them again.

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