Yes, I know and have used later that Tw-Slowroll can be changed to grub2-efi. But when I a few months ago did the upgrade installation from usb, there was no warning that the default bootloader had been changed to grub2-bls. Just before the upgrade installation finished, a message arived that the bootloader was incompatible and could not be upgraded. Afterwards the boot menu had not probed entries for the other Lp15 and Tw in the multiboot setup. Then I ran the Lp15 YaST2 Bootloader which completed the boot menu for all distributions.
Refere also another forum post
Problems dual-booting with Grub2-BLS
But my main issue now are how to get loaded the current last kernel-longterm 6.12.63-1.1 installed, so Nvidia drivers can be correct build?
I have verified also on my primary menitoned workstation (2) Alder Lake w/ Intel Arc A750 gpu only, that the Slowroll kernel state is identical.
And why does this happend, a bug in Tw-Slowroll?
I think I noticed once message that there was no more space on /boot/efi
If so how to possibly cleanup and free up space by removing older kernels ?
Is there a safe way to remove older kernels with zypper?
uname -r
6.12.63-1.0.4.sr20251204-longterm
zypper se -is kernel-longterm
Loading repository data...
Reading installed packages...
S | Name | Type | Version | Arch | Repository
---+-----------------+---------+----------------------------+--------+----------------------------------
i+ | kernel-longterm | package | 6.12.63-1.1 | x86_64 | Hovedpakkebrønn (OSS)
i+ | kernel-longterm | package | 6.12.63-1.1 | x86_64 | Hovedpakkebrønn for oppdateringer
i+ | kernel-longterm | package | 6.12.63-1.0.4.1.sr20251204 | x86_64 | Hovedpakkebrønn for oppdateringer
zypper lr -uP
# | Alias | Name | Enabled | GPG Check | Refresh | Priority | URI
--+----------------------------------------+-----------------------------------+---------+-----------+---------+----------+--------------------------------------------------------
5 | packman | Packman | Yes | (r ) Yes | Yes | 70 | https://ftp.fau.de/packman/suse/openSUSE_Slowroll/
1 | download.opensuse.org-non-oss | Hovedpakkebrønn (NON-OSS) | Yes | (r ) Yes | Yes | 99 | http://download.opensuse.org/slowroll/repo/non-oss/
2 | download.opensuse.org-oss | Hovedpakkebrønn (OSS) | Yes | (r ) Yes | Yes | 99 | http://download.opensuse.org/slowroll/repo/oss/
3 | download.opensuse.org-oss_1 | Hovedpakkebrønn for oppdateringer | Yes | (r ) Yes | Yes | 99 | http://download.opensuse.org/update/slowroll/repo/oss/
4 | opensuse-guide.org-openSUSE_Tumbleweed | libdvdcss repository | Yes | (r ) Yes | Yes | 99 | https://opensuse-guide.org/repo/openSUSE_Tumbleweed/
6 | repo-openh264 | Open H.264 Codec (openSUSE Tumb-> | Yes | (r ) Yes | Yes | 99 | http://codecs.opensuse.org/openh264/openSUSE_Tumbleweed