I can confirm the same behavior with Kubuntu 24.04 upgraded from 6.8.0-49 to 6.8.0-50. System boots to LUKS password prompt and I get 2 seconds or so to type before the screen blanks for 2 seconds. When it returns I am unable to type. Using Grub Advanced I can force the boot to 6.8.0-49 and everything works fine as before. Alternatively I can use Grub Advanced to edit the 6.8.0-50 command line and remove quiet and splash to do a text boot. In that mode I still get the flash behavior; however, I am able to continue typing after the flash. I found several Mint related posts complaining about the same kernel with the same issue.
My system is an AMD 5950X with and AMD 7800XT video card. RAM is 64GB. Keyboard and mouse are Razer and they are hard wired in. When Windows 11 people want to switch to Linux, this kind of behavior is very unsettling to them. While my experience gives me the ability to work around it, this really needs to be fixed. Its not comforting to find and 8 year old ticket that describes the same issue. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1621367 Title: 4.4.0-36: keyboard dead at boot & full disk encryption prompt for password Status in linux package in Ubuntu: Confirmed Bug description: After updating to kernel 4.4.0-36.55, I cannot enter the password for the full disk encrypted drive, that contains the ubuntu installation. Keyboard is totally dead. Nothing else than hardware reset is possible. This bug affects normal, upstart and recovery boot. I don't know whether that is a kernel panik (no led is blinking) or the driver for keyboard is failing. boot.log looks normal to me. Last and working kernel version before the update, was "Ubuntu 4.4.0-34.53-generic 4.4.15". I cannot report "ubuntu-bug linux", because I cannot enter the system. I am willing to investigate, but please give me hints. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1621367/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
