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The problem is the option boot performance mode that have the value turbo performance. I changed my psu, gpu, I removed all expansion cards and it continues. I am tracking an old bug with windows timer resolution that stack randomly at 0.5 ms after a pc restart.Īt first I thought that is a driver bug, but this exist in windows 8.1 and 10. If i provide the uefi bios can anyone check it?ĮDIT by Fernando: Thread title customize to make it more specific When set to 0, The OS shall not modify the corresponding USB2HCSEL bit. When set to 1, the OS may switch the PCH USB 2.0 port between the EHCI and xHCI host controllers by modifying the corresponding USB2HCSEL bit (D20:F0:D0h, bit 3:0). This bit field allows the BIOS to communicate to the OS which PCH USB 2.0 ports can be switched from the EHC controller to the xHC controller. USB 2.0 Host Controller Selector Mask (USB2HCSELM) - R/WL. Iwant the usb.2 ports to rout from echi and usb3.0 ports from xchi is this possible? There exist an option in bios that is locked that Allows you to manually rout each USB If u have the usb3.0 on (enabled ,auto or smart auto) The usb 2.0 devices in asrock run from xchi controller (usb 3.0) (pic 1) and not use the ehci controller.(pic 2) The intel specification leaves the motherboard developers to run usb.2.0 devices from ehci or xhci. If they work try installing the chipset driver again followed by the USB3.0 driver.The z97 has 2 chipset have 2 ehci controllers(usb.2.0) and one xhci usb.3.0 controller. Uninstall them all and then reboot, windows should detect and install the drivers automatically (with Windows base drivers)

Have you tried uninstalling the items flagged in the device manager? I downloaded new drivers from Intel and installed them but the fault still remains and the ports do not work, i have also removed the ASUS live update.Ĭan anybody help me or do i need to take it back to the dealer. I checked the device manager and found that under the universal serial bus controllers i have three yellow triangles in front of Intel R 7 series/C216 chipset as well as on the USB 3.0 extensible host controller. I plugged my iPhone in and my computer did not even acknowledge that it had been plugged in, also tried ant+ usb stick for my Garmin heart rate monitor and this was also not recognized. I recently purchased a G75 which i have been very happy with.