Source: linux Severity: wishlist Dear Maintainer,
Currently, Debian does not enable CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER by default. I'd like to request that this config options be enabled for UEFI-enabled architectures in order to better support flicker-free boot. CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER defers the clearing of the framebuffer console until the first text is displayed on the console. Without this option, there is a brief time between the firmware splash screen and the initialization Plymouth splash screen where the kernel may clear the graphics from the firmware. When booting with "quiet", this will result in a black flicker between the UEFI firmware and Plymouth. Without "quiet", text output is briefly visible as expected. By enabling the deferred takeover, the graphics from the firmware can remain in the framebuffer until either a) the kernel begins printing text or b) Plymouth (or similar software) takes control and does whatever it's been configured to do. In cases where flicker-free boot is desired, that would typically be reusing the BGRT graphics in the framebuffer and overlaying or augmenting it with additional elements like a loading spinner. Other distributions have already used the options for a while in stable configurations (Fedora, NixOS, Red Hat, OpenSUSE, Arch Linux, etc.), so I believe the change would be relatively low-impact. There were some concerns around combining GRUB and deferred takeover, but I believe that was fixed back in 2018 by Fedora. -- System Information: Debian Release: 13.2 APT prefers stable-updates APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable') Architecture: amd64 (x86_64) Kernel: Linux 6.12.57+deb13-amd64 (SMP w/2 CPU threads; PREEMPT) Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=locale: Cannot set LC_ALL to default locale: No such file or directory UTF-8), LANGUAGE=en_US:en Shell: /bin/sh linked to /usr/bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled
