(In reply to Martin Schmidt from comment #20) > Booting from the 21.2-kernel ends up with single screen system, now on the > first screen, but with only 640x480 resolution. These two are behavior common to nouveau kernel module needed but not loaded. @Martin, are you using only standard repos?: # | Alias | Enabled | GPG Check | URI --+--------------+---------+-----------+------------------------------------------------------------------ 1 | NonOSS | Yes | (r ) Yes | http://download.opensuse.org/distribution/leap/15.6/repo/non-oss/ 2 | OSS | Yes | (r ) Yes | http://download.opensuse.org/distribution/leap/15.6/repo/oss/ 3 | Update | Yes | (r ) Yes | http://download.opensuse.org/update/leap/15.6/oss/ 4 | UpdateBP | Yes | (r ) Yes | http://download.opensuse.org/update/leap/15.6/backports/ 5 | UpdateNonOSS | Yes | (r ) Yes | http://download.opensuse.org/update/leap/15.6/non-oss/ 6 | UpdateSLE | Yes | (r ) Yes | http://download.opensuse.org/update/leap/15.6/sle/