On 4/16/25 04:30 PM, Steven A. Falco wrote:
On 4/16/25 04:42 AM, Peter Robinson wrote:
I had a brief look at this earlier and there didn't look to be much specific in the details between the reported work/fail kernels but it seems it might be related to AMD hardware but I don't know the details of various reported motherboard models and didn't have the time to google all the various chipsets.
It is looking like this is somehow related to the specific kernel configuration.
I tried building from the kernel-6.14.2-0 tag of the kernel-ark repo. If I use config-6.13.10-200.fc41.x86_64 the resulting 6.14 kernel works fine.
If I instead use config-6.14.2-300.fc42.x86_64 the resulting 6.14 kernel fails to activate some of my USB controllers.
No idea yet which configuration item is responsible. Sadly there are quite a few differences. At some point if I have time I'll experiment further, but for now I'll just stay with my own kernel build of 6.14 and see if it is solid. So far it seems to be.
Found it!
If I turn off CONFIG_PCI_REALLOC_ENABLE_AUTO then all my USB devices behave. But with CONFIG_PCI_REALLOC_ENABLE_AUTO=y then some of my USB controllers are broken.
I'll note that in both the Fedora bug and in the upstream kernel bug. I'm not sure what the next step would be, but this should narrow it down.
Joe - if you are able to build a kernel it would be great to know if that helps you too.
Steve
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