dell-mario l
2 Iron

Re: XPS 9300 BIOS 1.0.7 Problem - System does not poweroff

To anyone encountering this, at this point it looks like a kernel regression in kernel 5.5.  This particular issue is popping up in Fedora because moves more rapidly to newer kernel versions.


The upstream kernel bug report is here:

And you can find a Fedora specific bug report here:

The commit that caused this problem is here:


Until the problem has been fixed in the upstream kernel and Fedora's kernel for a workaround you can turn off "VT-d" in BIOS setup.  This is not a permanent solution as by doing so you will turn off DMA attack mitigations such as those discussed in public vulnerabilities like Thunderspy.   The permanent solution will need to be discussed upstream.