Bug 276206
| Summary: | Setting kern.vty="sc" will hang the loader boot process, but vt(4) says we can do that | ||
|---|---|---|---|
| Product: | Documentation | Reporter: | hym2209268914 |
| Component: | Manual Pages | Assignee: | Ed Maste <emaste> |
| Status: | Closed FIXED | ||
| Severity: | Affects Only Me | CC: | concussious.bugzilla, darius, doc, emaste, kevans, maxim, swills |
| Priority: | --- | Keywords: | vt |
| Version: | Latest | ||
| Hardware: | amd64 | ||
| OS: | Any | ||
Can you upload a photo of where it hangs? It hangs right after the loader loads the kernel, and prints the EFI framebuffer information as usual, where the kernel should clear the screen and print dmesg in a couple of seconds. There are no error message. Hi, Probably not a solution but rather a workaround: give a try to "hw.vga.textmode=1" Maxim syscons notably doesn't know at all how to find the efi framebuffer, so if you're booting via efi this is expected and the machine likely isn't actually hung (but just not drawing to the screen). Maybe we should add a note to vt(4) pointing out which tunables are not available in UEFI booted systems? (In reply to Maxim Konovalov from comment #3) hw.vga.textmode=1 does not seem to work in uefi either. Note that this is documented in syscons(4):
Note that the syscons driver is not compatible with systems booted via
UEFI(8). Forcing use of syscons on such systems will result in no usable
console.
https://reviews.freebsd.org/D45357 for a vt(4) man page update to note this A commit in branch main references this bug: URL: https://cgit.FreeBSD.org/src/commit/?id=f52481f3b8a377e336ecba1b5150023a344ec189 commit f52481f3b8a377e336ecba1b5150023a344ec189 Author: Ed Maste <emaste@FreeBSD.org> AuthorDate: 2024-05-24 21:45:14 +0000 Commit: Ed Maste <emaste@FreeBSD.org> CommitDate: 2024-05-24 23:55:10 +0000 vt(4): add note about sc/UEFI incompatibility syscons is not compatible with UEFI boot. This is noted in syscons(4), but not mentioned in vt(4) where the kern.vty tunable (used to select vt or sc) is documented. Add a note so that if someone reads vt(4) but not sc(4) they are not surprised by having no usable console. PR: 276206 Reviewed by: brooks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D45357 share/man/man4/vt.4 | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) A commit in branch stable/14 references this bug: URL: https://cgit.FreeBSD.org/src/commit/?id=03d3230d51529a38e0c90ff324145dbfe209307d commit 03d3230d51529a38e0c90ff324145dbfe209307d Author: Ed Maste <emaste@FreeBSD.org> AuthorDate: 2024-05-24 21:45:14 +0000 Commit: Ed Maste <emaste@FreeBSD.org> CommitDate: 2024-05-27 15:24:13 +0000 vt(4): add note about sc/UEFI incompatibility syscons is not compatible with UEFI boot. This is noted in syscons(4), but not mentioned in vt(4) where the kern.vty tunable (used to select vt or sc) is documented. Add a note so that if someone reads vt(4) but not sc(4) they are not surprised by having no usable console. PR: 276206 Reviewed by: brooks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D45357 (cherry picked from commit f52481f3b8a377e336ecba1b5150023a344ec189) share/man/man4/vt.4 | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) A commit in branch stable/13 references this bug: URL: https://cgit.FreeBSD.org/src/commit/?id=bbb6bfeaae460ae1be5218d4456e47dfd86fa62d commit bbb6bfeaae460ae1be5218d4456e47dfd86fa62d Author: Ed Maste <emaste@FreeBSD.org> AuthorDate: 2024-05-24 21:45:14 +0000 Commit: Ed Maste <emaste@FreeBSD.org> CommitDate: 2024-05-27 15:25:28 +0000 vt(4): add note about sc/UEFI incompatibility syscons is not compatible with UEFI boot. This is noted in syscons(4), but not mentioned in vt(4) where the kern.vty tunable (used to select vt or sc) is documented. Add a note so that if someone reads vt(4) but not sc(4) they are not surprised by having no usable console. PR: 276206 Reviewed by: brooks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D45357 (cherry picked from commit f52481f3b8a377e336ecba1b5150023a344ec189) (cherry picked from commit 03d3230d51529a38e0c90ff324145dbfe209307d) share/man/man4/vt.4 | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) |
From manpage vt(4), LOADER TUNABLES: kern.vty Set this value to `vt' or `sc' to choose a specific system con- sole, overriding the default. The GENERIC kernel uses vt when this value is not set. on my GENERIC kernel shipped with 14.0-RELEASE, adding a line to /boot/loader.conf 'kern.vty="sc"' will hang the loader while loading kernel and trying to boot.