Daniel, I think there is no evidence there that it's the same problem that the one you duplicated from.
@Luis, could you add "drm.debug=0x4 log_buf_len=10M" to your kernel commandline (https://wiki.ubuntu.com/Kernel/KernelBootParameters) and then after boot do: dmesg > dmesg.txt And attach dmesg.txt to the report? ** This bug is no longer a duplicate of bug 1836858 Display flickers (monitor loses signal briefly) during "flickerfree" boot, while showing the BIOS logo on a black background ** Changed in: plymouth (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1871637 Title: [flicker free boot] boot image disappears for a second before LUKS prompt To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/plymouth/+bug/1871637/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs