1. Please describe the problem:


1.1-Migration from Fedora 29 (latest release) to Fedora 31 (5.3.12-300.fc31.x86_64) worked fine: I recovered the same environment; successful several boots and reboots. In the dual boot menu both Fedora 29 and 31 kernels  appear, as well as a rescue kernel and the Windows boot manager.

1.2-Update to Fedora 31 (5.3.13-300.fc31.x86_64), from the upgrade graphical menu.

1.3-UNABLE to re-boot: black screen and unable to access the Linux directories (/home  ….). The Windows boot still works, but none of the three fedora releases works (Fedora 31_5.3.13, Fedora 31_5.3.12, Fedora 29, Fedora rescue).

1.4-Successful installation of Fedora 31 (5.3.7-301.fc31.x86_64) on a new raw partition of the disk from Live USB (created with Fedora Media Writer). Boot and reboot worked fine.

1.5-UNABLE to reboot after the upgrade to Fedora 31 (5.3.16-300.fc31.x86_64) within the upgrade menu: stuck on black screen.

1.6-SAME results after reinstallation from the USB key, upgrade to 5.3.16-300 and manually update with the commands sudo  dnf update –refresh and then  sudo grubby –update-kernel=ALL –args=”dis_ucode_ldr” or typing directly   ”dis_ucode_ldr” in the command line of the boot menu on the screen. 
   
1.7-Removing the argument “quiet”  in the command line of the boot menu does not result to any info on the screen: this tends to point to a bug right at the beginning of the launch procedure.

1.8-I have updated the BIOS and the Intel chip drivers via the Dell Assist software.

1.9-Since the problems does not occur just after the migration form Fedora 29 to 31 and just after the installation from USB, I am inclined to think that it has to do with the upgrade procedure that is built in the Fedora 31 distribution    (although I am not expert in that matter).

1.10-So my questions are: i) what is the stable solution to this problem (I cannot rely on a system  which stops after the first update) and   ii) is there a way to recover the existing Linux partition that are still on the PC (without starting from scratch, and loosing the existing environment).

1.11-Thanks in advance for any help.


2. What is the Version-Release number of the kernel:

           5.3.12-300.fc31.x86_64  5.3.16-300.fc31.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 :

     See above

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

     Yes, see above

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``:

    Black screen, I have no access to the OS


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.

    Black screen: I have no access to any file, journal, etc...!!!