Hi Daniel, I have completed a final control test. Using the exact same setup (standard Ubuntu 26.04) but running on the stable kernel 6.17, the system is 100% stable. No crashes occurred during the same workload.
Further findings from the 7.x kernel crash: The Trigger: I discovered the exact moment of the crash. It happens right after the PDF is printed, at the very second the application (Pohoda/Remmina) attempts to display a dialog box asking: "Do you want to open the printed PDF?". This graphical trigger instantly freezes the session. Dead USB Subsystem: I followed your suggestion regarding the USB keyboard. When the crash occurs, the USB keyboard goes completely dead. I cannot even toggle NumLock or CapsLock LEDs. This confirms a deep kernel/driver lockup affecting the USB subsystem, making any "VT switch" shortcuts physically impossible to register. Validation: The fact that kernel 6.17 handles this exact scenario (including the PDF dialog prompt) perfectly on the same hardware and software configuration confirms this is a severe regression in the 7.x kernel's i915 driver or related input/display management. I have provided all the evidence I can. For my production work, I am permanently switching back to kernel 6.17 until this regression is addressed. Milan -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2152124 Title: Sudden loss of session (back to login/initramfs screen) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2152124/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
