Created attachment 1786709 [details]
vmcore-dmesg.txt

1. Please describe the problem:
when booting to 5.12 kernels t400 freezes

2. What is the Version-Release number of the kernel:
5.12.x-300.fc34.x86_64

3. Did it work previously in Fedora? If so, what kernel version did the issue
   *first* appear?  Old kernels are available for download at
   https://koji.fedoraproject.org/koji/packageinfo?packageID=8 :
yes 5.11.x-300.fc34.x86_64 works fine

4. Can you reproduce this issue? If so, please provide the steps to reproduce
   the issue below:

on lenovo t400 install lxdm and 5.12 kernel

5. Does this problem occur with the latest Rawhide kernel? To install the
   Rawhide kernel, run ``sudo dnf install fedora-repos-rawhide`` followed by
   ``sudo dnf update --enablerepo=rawhide kernel``:

no, 5.13.0 kernels are fine

6. Are you running any modules that not shipped with directly Fedora's kernel?:

no

7. Please attach the kernel logs. You can get the complete kernel log
   for a boot with ``journalctl --no-hostname -k > dmesg.txt``. If the
   issue occurred on a previous boot, use the journalctl ``-b`` flag.

will be attached