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: 

https://bugzilla.kernel.org/show_bug.cgi?id=206571

And you can find a Fedora specific bug report here:

https://bugzilla.redhat.com/show_bug.cgi?id=1834277

The commit that caused this problem is here:

https://github.com/torvalds/linux/commit/6c3a44ed3c553c324845744f30bcd1d3b07d61fd

 

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.