[Bug 209213] UEFI Loader shows only black screen - kernel output normal

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209213

            Bug ID: 209213
           Summary: UEFI Loader shows only black screen - kernel output
                    normal
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Keywords: uefi, vt
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: gravity6 at gmx.de
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org
             Flags: maintainer-feedback?, exp-run?, mfc-stable9?,
                    mfc-stable10?

The Notebook is a Clevo P750ZM (rebranded as XMG U505) with BIOS 1.05.01a
configured to boot UEFI. Booting and installing is possible, Nvidia GTX970m is
supported. But the first screen output is when the kernel starts. While the
loader is active, there is just a black screen

 kernel: VT(efifb): resolution 1280x1024

I tried settings in loader.conf, but without success:

 boot_multicons="YES"
 console="efi,vidconsole,comconsole"

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