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vt(4): Document kern.vt.fb.default_mode and kern.vt.fb.modes.*

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Those tunables are used to set a specific mode in vt(4) instead of using
the default mode.

Differential Revision:	https://reviews.freebsd.org/D1098
Reviewed by:	ak@, emaste@, kwm@
MFC after:	1 week
This commit is contained in:
Jean-Sébastien Pédron 2014-11-03 14:57:41 +00:00
parent c15af11534
commit 79c4bda828
1 changed files with 41 additions and 1 deletions
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42
share/man/man4/vt.4
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@ -45,6 +45,8 @@ In
.Xr loader.conf 5 :
.Cd hw.vga.textmode=1
.Cd kern.vty=vt
.Cd kern.vt.fb.default_mode="<X>x<Y>"
.Cd kern.vt.fb.modes.<connector>="<X>x<Y>"
.Pp
In
.Xr loader.conf 5 or
@ -176,7 +178,7 @@ Otherwise,
switches to 640x480x16 VGA mode using
.Cm vt_vga .
If a KMS
.Pq Kernel Mode Switching
.Pq Kernel Mode Setting
video driver is available, the display is switched to high resolution
and the KMS driver takes over.
When a KMS driver is not available,
@ -203,6 +205,28 @@ By default,
is used on computers that boot from BIOS, and
.Nm
is used on computers that boot from UEFI.
.It Va kern.vt.fb.default_mode
Set this value to a graphic mode to override the default mode picked by the
.Nm
backend. The mode is applied to all output connectors. This is currently
only supported by the
.Cm vt_fb
backend when it's paired with a KMS video driver.
.It Va kern.vt.fb.modes. Ns Pa connector_name
Set this value to a graphic mode to override the default mode picked by the
.Nm
backend. This mode is applied to the output connector
.Pa connector_name
only. It has precedence over
.Va kern.vt.fb.default_mode .
To know the list of available connectors, load the KMS driver and look
at
.Xr dmesg 8 :
it'll contain a list of connectors and their associated tunables. This
is currently only supported by the
.Cm vt_fb
backend when it's paired with a KMS video driver.
.El
.Sh KEYBOARD SYSCTL TUNABLES
These settings control whether certain special key combinations are enabled or
ignored.
@ -255,6 +279,22 @@ This line changes the default color of kernel messages to be bright red
on a black background, or black on a bright red background when reversed.
.Pp
.Dl "options TERMINAL_KERN_ATTR=(FG_LIGHTRED|BG_BLACK)"
.Pp
To set a 1024x768 mode on all output connectors, put the following line in
.Pa /boot/loader.conf :
.Pp
.Dl kern.vt.fb.default_mode="1024x768"
.Pp
To set a 800x600 only on a laptop builtin screen, use the following line instead:
.Pp
.Dl kern.vt.fb.modes.LVDS-1="800x600"
.Pp
The connector name was found in
.Xr dmesg 8 :
.Pp
.Dl info: [drm] Connector LVDS-1: get mode from tunables:
.Dl info: [drm] - kern.vt.fb.modes.LVDS-1
.Dl info: [drm] - kern.vt.fb.default_mode
.Sh SEE ALSO
.Xr kbdcontrol 1 ,
.Xr login 1 ,