Comment 0 for bug 1780598

In /etc/default/grub are two variables that enable customization of kernel options : GRUB_CMDLINE_LINUX_DEFAULT for non-recovery entries and GRUB_CMDLINE_LINUX for all entries (both recovery and non-recovery).

It is not possible to specify kernel options to be used for recovery entries but not regular ones, which in my case is problematic as modesetting parameters are at a contradiction in those cases.

I propose that the GRUB_CMDLINE_LINUX_RECOVERY would allow to do so. This requires exporting this variable in the grub-mkconfig script, so that it can be read by the 10_linux script.

There, I propose to keep the usual behaviour when the variable has not been set, and to completely eschew it when the variable is set.

I am reporting here as it appears that upstream grub 10_linux does not have a mechanism for recovery entries at all, so I think it is Ubuntu specific.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: grub-common 2.02-2ubuntu8 [modified: usr/sbin/grub-mkconfig]
ProcVersionSignature: Ubuntu 4.15.0-24.26-generic 4.15.18
Uname: Linux 4.15.0-24-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CurrentDesktop: XFCE
Date: Sun Jul 8 09:07:07 2018
InstallationDate: Installed on 2016-09-07 (668 days ago)
InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
SourcePackage: grub2
UpgradeStatus: Upgraded to bionic on 2018-07-01 (6 days ago)
modified.conffile..etc.grub.d.10_linux: [modified]
modified.conffile..etc.pm.sleep.d.10_grub-common: [modified]
mtime.conffile..etc.grub.d.10_linux: 2018-07-08T09:04:49.307828
mtime.conffile..etc.pm.sleep.d.10_grub-common: 2016-09-09T08:55:42.654798