Error message in centos 7 AMD-Vi: Completion-Wait loop timed out

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Terminator7000
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Joined: 2018/08/25 22:31:39

Error message in centos 7 AMD-Vi: Completion-Wait loop timed out

Post by Terminator7000 » 2018/08/25 23:00:32

I used Rufus to compile a bootable usb drive to install Centos 7 when I try to install I keep getting this error message "AMD-Vi: Completion-Wait loop timed out" After researching in detail I found out that the problem is possibly due to the ryzen 7 1700 I also get error messages after that "Kernel Offset: 0x3e00000 from 0xfffffff81000000 (relocationrange: 0xffffffff800000000-0xfffffffffbfffffff". Current Kernel running is 3.10.0-862.e17.x86_64 and all of the solves that I found on the net told me to install a 3.xx kernel which I have. Does any one know how solve the issue with the AMD-VI... error because it keeps repeating and the installation crashes.

The Current build is
CPU: Ryzen 7 1700
Motherboard: Mohawk B350
Ram: G.SKILL Aegis 16GB 288-Pin DDR4 SDRAM DDR4 2400
Video Cards: RX 480

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TrevorH
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Re: Error message in centos 7 AMD-Vi: Completion-Wait loop timed out

Post by TrevorH » 2018/08/26 10:38:40

I used Rufus to compile a bootable usb drive to install Centos 7
Did it install or are the problems you have during the install? If they're during the install then I would recommend recreating the USB stick from the iso image, only this time use plain old 'dd' to do it. Rufus in some configurations can alter the iso image as it copies it and will break it.

I did a quick search via google and everything I saw says this problem can be bypassed by passing iommu=soft via the kernel command line. Depending on whether you are using UEFI or legacy BIOS, during the install, when you see the first CentOS menu asking you if you would like to Install, Verify Media and Install, or do Troubleshooting, you should press either the tab key (Legacy BIOS mode) or hit 'e' to edit the menu (UEFI mode) then scroll to the end of the line and remove the words 'rhgb' and 'quiet' (if present) and append a space followed by iommu=soft then hit either Ctrl-X (UEFI mode) or press Enter (Legacy BIOS mode) to boot up.

You might also want to check for more up to date firmware/BIOS for your motherboard.
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