Hi,
After install new kernel 6.11.8-300.fc41.x86_64 , when I start Fedora 41 KDE Plasma, enter passphrase to decrypt disk and login to Plasma, after few second my system is crashing - is just shut down entire laptop without any reason/error, sometimes is some freeze, but this is only on 6.11.8, when I back to 6.11.7 everything is back.
Furthermore, I see a some stuff doesn’t work - one of many is brightness screen.
Posting your syslog is going to be required - there’s no way anyone can assist without something to look at.
For syslog read system journal.
You can use the journalctl -b -1 to see the failed boots logs.
Ah - IBM MVS user so syslog trips off the toungue for me.
Just to avoid wasting your time: you can try if the issue/bug is already solved in 6.11.9:
sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2024-c5baa66128
This command will install the 6.11.9 kernel, which is currently in testing, but the command will only get the kernel and its packages from testing for one time. This command will NOT enable testing by default or so.
6.11.9 has been already tested by many people without issues:
https://bodhi.fedoraproject.org/updates/FEDORA-2024-c5baa66128
→ therefore, it is likely that it is pushed to stable quickly anyway.
Maybe that already solves the issue 
Otherwise, if 6.11.9 does not help, it might be useful to get the journal, as Barry already suggested. But beyond the whole log, it might be useful to also have a log that contains only kernel messages (add option -k to Barry’s command). If you prefer providing rather less than more details, you might start with the kernel logs only. Given what you elaborate, I assume the kernel entries are the major indicators anyway. But let’s hope that 6.11.9 solves the issue 
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I am having a similar issue on kernel 6.11.11-300 after updating to F41 from F40. I can still boot fine under the previous kernel, but when I try to boot under the new one it kernel panics a little bit after unlocking the encrypted drive. The message that shows the kernel panic completely disappears (screen goes blank) before I can get a good look at it and the whole system freezes up. I couldn’t find anything in /var/log/messages from the boot to indicate what might be wrong. I have tried reinstalling the new kernel with no change at boot.
Generally, you have a new issue and therefore, please open a new topic about it.
However, several issues have occurred with 6.11.11, and so far it seems problems can be solved by 6.12.4, which contains already many bug fixes. You have to know that 6.11.11 marks the end of life of 6.11, and so any fix would end up in a 6.12 kernel anyway (so maybe your issue has been already fixed in 6.12.X). Another 6.11 kernel would only be released in “emergencies”, which is unlikely at this time.
Therefore, you might update (or wait for the update) to 6.12.4 and see if your issue remains, and if the issue remains, then open a new topic about it.
You can update already now (6.12.4 is still in testing although a lot of people have already successfully tested it) (click here for the bodhi link and use the yellow-coloured dnf command to install 6.12.4) or you can just wait until it is pushed to stable and ends up in your daily updates (which is likely to happen soon). If you choose the latter, you might stick with 6.11.10 in the meantime.
Also, if the 6.12.4 update does not solve the issue, you might ensure to retain sufficient old kernels to avoid that the last working kernel gets removed at any kernel update. You might read this about increasing the amount of kernels: After offline upgrade via DNF5, "/init: error while loading shared libraries: libsystemd-core-256.9-2.fc41.so: cannot open shared object file: No such file or directory" causes kernel panic on boot - #12 by py0xc3