On Mon, 2026-05-11 at 17:27 +0300, Askar Safin wrote: > Ben Hutchings <[email protected]>: > > - In the kernel, we cannot assume that an EFI framebuffer is always > > usable. In particular, older versions of GRUB may break it by using > > a native graphics driver, but without clearing whatever signals the > > kernel that it is available. This was fixed upstream in the default > > config for GRUB 2.14 but we cannot assume that the config change > > actually gets applied to existing installations. > > It WILL be applied to existing installations.
That depends on just how much customisation was done. > Here is upstream commit in question: > https://cgit.git.savannah.gnu.org/cgit/grub.git/commit/?id=ea0b76dc4a003f2b7f828ef0c24cc8227148b2f8 > > It changed file util/grub.d/00_header.in in the repo. It corresponds to > /etc/grub.d/00_header in installed system. It is script, which is used > when generating /boot/grub/grub.cfg . > > /etc/grub.d/00_header is present in output of > "dpkg-query -W -f='${Conffiles}\n' grub-*", but I think that this is > highly unlikely that users manually edited that file. It is a conffile, therefore we support users modifying it. So if we want to make a switch on upgrade we'll have to check the GRUB configuration to figure out whether that is safe. That's not actually possible because the configuration is a script and not static definitions. The best I think we can do is "if the GRUB configuration is unmodified from the shipped files, we can safely switch". > So the file will be simply replaced on upgrade, and then new > /boot/grub/grub.cfg > will be generated from it. > > Also note that I only was able to reproduce that GRUB bug in Qemu only. > And I was not able to reproduce it on real hardware. [...] But why does that matter? There are a lot of Debian systems running in VMs and some fraction of those do have people looking at their graphical output. Ben. -- Ben Hutchings - Debian developer, member of kernel, installer and LTS teams
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