Updating broke Cinnamon for me. I was on 19.1 Tessa, Cinnamon edition, and updated to 19.2 through the Update Manager. Now when I boot I get the message “Cinnamon just crashed. You are currently running in Fallback Mode” and I have the option of restarting Cinnamon, but it immediately crashes again. I’ve tried with kernel versions 220.127.116.11, 5.0.0-20, and 4.15.0-55. My graphics card is an RX480.
I tried running
cinammon --replace in the terminal. The output can be found here.
I tried booting into recovery mode then selecting the option to continue into a normal boot. I then got a message saying that "Your system is currently running without video hardware acceleration." However, Cinnamon is working fine. This is Mint 19.2, Cinnamon version 4.2.3, and kernel version 5.0.0-23-generic.
This is the output of running
cinnamon --replace on the working Cinnamon desktop I get from booting through recovery mode. Conspicuously, the crashing version has the line
cinnamon: ../src/gallium/drivers/radeonsi/si_state_viewport.c:239: si_emit_guardband: Assertion `left <= -1 && top <= -1 && right >= 1 && bottom >= 1' failed. where the working version is starting to add systrays.
Finally, I tried booting normally but selecting Cinnamon with software rendering at the login screen. It worked fine. Then I tried to restart Cinnamon and got this output with the same error message with the driver. It definitely seems like a driver issue, but I don't know how to resolve it.
Edit: this is the subject of a bug discussion on Github. It seems to have to do with the position of monitors in a multi-monitor setup.