But my notebook after the same update is working.
What to do?
Maybe I should report an error in kernel, but I don’t know where it is to do.
My hardware:
Hello @mbavyka ,
Welcome to the ask.fp.o discussion area. Could you provide a bit more info regarding “not booting”? As in what happens when you try to boot the system? Do you get to the login? Does it get to any portion of the splash screen? Can you get to a terminal?
Stephen thank you for interest of my problem! 
Could you provide a bit more info regarding “not booting”?
Yes!
As in what happens when you try to boot the system?
I press power button, shows BIOS screen, black screen, that’s all.
Do you get to the login?
No.
Does it get to any portion of the splash screen?
No.
Can you get to a terminal?
No.
Please help! 
Well, it sounds as if your upgrade didn’t finish the bootloader specific steps. Is this an EFI system? Perhaps your BIOS is not selecting the proper boot partition
Did you try to press shift button to get boot menu of grub and select older kernel
Igor, thank you for interest of my problem!
Did you try to press shift button to get boot menu of grub and select older kernel
I don’t tried to do it. But when black screen I press reboot (or reset) button and after reboot computer shows me menu where I can choose kernel version. If I upgrade the kernel several times again, the version of the kernel that is running may not be listed. Kernel version 5.14.14 and lower works well.
Is this an EFI system?
Yes.
I forgot to tell you that after UEFI screen, computer shows me blinking underscore.
Fedora error reporter showed me that unable to create error report but i can contact kernel maintainers via e-mail. But there’s no an email, where i can find it?
This is their site on Pagure https://src.fedoraproject.org/rpms/kernel where you would look for your issue, maybe it’s being worked on already. If there isn’t one. maybe you want to open one up. So, is this Workstation or one of it’s spins? Or is it Silverblue or anotherr of the ostree based variants?
Workstation.
Well, if you can boot into the default, try to do a journalctl -b -1 priority=3. This will give you the errors of the last boot, hopefully something got logged. You could also see if the boot is hung by trying the numlock or caplock keys at that time, if the lights change state it isn’t completely hung and you may find a path forward at https://docs.fedoraproject.org/en-US/quick-docs/debug-dracut-problems/.
When I entered command journalctl -b -1 priority=3 I received Failed to add match ‘priority=3’: Incorrect argument.
Caps Lock and Num Lock works.
Similar problem or the same problem HERE
sorry --priority=3
Well, one thing to note is that apparently AMD has some Linux kernel developers working for them and they are supposed be making considerable updates to the kernel WRT AMD CPU/GPU offerings. This is something I have been waiting on for many years, while intel hardware enjoyed better kernel support due to their offering of Clear Linux. For example of the disparity, look at the power profile daemon, it doesn’t recognize what that my previous AMD cpu (an Athalon 2 Phenom) with 6 cores and overclocking capabilities was in any way shape or form capable of performance mode. The same is able to be said for my recently purchased AMD Ryzen 5600G CPU with built in Radeon graphics processor. I am hopeful with the kernel 5.15 release, us AMD CPU users will be getting better kernel support for our hardware.
I hope too.
