Hi Guixers After updating my system to the newest commit my system shows a black screen after login. I booted the old generation #135 and had access to my system again. This generation is still with linux 7.1, which I see in the grub menu. Now I extracted the commit of the good generation with
guix system describe /var/guix/profiles/system-135-link/profile and found the good commit 5c217ab1361758851ac89bc523015fcd965c0a83. I reconfigured my system with this commit in channels.scm with sudo guix time-machine --channels=channels.scm -- system reconfigure --allow-downgrades config/system/my-system.scm but when I reboot I am stuck with a black screen after login again. What is also very weird is that the grub menu shows the system has linux 7.2, which should not be the case according to the commit. Also uname -a returns linux 7.1, there seems to be an display error in the grub menu. Looking at /var/log/messages I see no obvious problems with my system. There are some errors: localhost linux: [ 0.286954] ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog (20251212/psobject-220) localhost linux: [ 1.815475] init[1]: segfault at 3fff00 ip 00000000004d5593 sp 00007ffdc591a7c0 error 4 in guile[d5593,401000+202000] likely on CPU 16 (core 8, socket 0) localhost linux: [ 2.979860] faux_driver regulatory: Direct firmware load for regulatory.db failed with error -2 ntpd[958]: kernel reports TIME_ERROR: 0x41: Clock Unsynchronized localhost gdm: Gdm: GdmLocalDisplayFactory: Failed to issue method call: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.login1 was not provided by any .service files but I cannot really tel which one causes the black screen after login. What concerns me is that there seems to be some state left which prevents my system from functioning with the good commit. Any ideas how to proceed from here? Best, Reza
