diff options
Diffstat (limited to 'Documentation/fb/fbcon.txt')
| -rw-r--r-- | Documentation/fb/fbcon.txt | 69 |
1 files changed, 59 insertions, 10 deletions
diff --git a/Documentation/fb/fbcon.txt b/Documentation/fb/fbcon.txt index b91aea57a98e..f373df12ed4c 100644 --- a/Documentation/fb/fbcon.txt +++ b/Documentation/fb/fbcon.txt @@ -180,10 +180,13 @@ fbcon. So, how do we unbind fbcon from the console? Part of the answer is in Documentation/console/console.txt. To summarize: -Echo the ID number of the 'frame buffer driver' to: +Echo a value to the bind file that represents the framebuffer console +driver. So assuming vtcon1 represents fbcon, then: -sys/class/tty/console/bind - attach framebuffer console to console layer -sys/class/tty/console/unbind - detach framebuffer console from console layer +echo 1 > sys/class/vtconsole/vtcon1/bind - attach framebuffer console to + console layer +echo 0 > sys/class/vtconsole/vtcon1/bind - detach framebuffer console from + console layer If fbcon is detached from the console layer, your boot console driver (which is usually VGA text mode) will take over. A few drivers (rivafb and i810fb) will @@ -211,19 +214,15 @@ restored properly. The following is one of the several methods that you can do: 5. Now to detach fbcon: - 'cat /sys/class/tty/console/backend' and take note of the ID - -The above is probably needed only once. Then: - vbetool vbestate restore < <vga state file> && \ - echo <ID> > /sys/class/tty/console/unbind + echo 0 > /sys/class/vtconsole/vtcon1/bind 6. That's it, you're back to VGA mode. And if you compiled fbcon as a module, you can unload it by 'rmmod fbcon' 7. To reattach fbcon: - echo <ID> > /sys/class/tty/console/bind + echo 1 > /sys/class/vtconsole/vtcon1/bind 8. Once fbcon is unbound, all drivers registered to the system will also become unbound. This means that fbcon and individual framebuffer drivers @@ -254,6 +253,8 @@ Variation 1: c. Attach fbcon vbetool vbestate restore < <vesa state file> && \ + echo 1 > /sys/class/vtconsole/vtcon1/bind + Variation 2: a. Before detaching fbcon, do: @@ -269,7 +270,55 @@ Variation 2: c. Attach fbcon: vbetool vbemode set <mode number> && \ - echo <ID> > /sys/class/tty/console/bind + echo 1 > /sys/class/vtconsole/vtcon1/bind + +Samples: +======== + +Here are 2 sample bash scripts that you can use to bind or unbind the +framebuffer console driver if you are in an X86 box: + +--------------------------------------------------------------------------- +#!/bin/bash +# Unbind fbcon + +# Change this to where your actual vgastate file is located +# Or Use VGASTATE=$1 to indicate the state file at runtime +VGASTATE=/tmp/vgastate + +# path to vbetool +VBETOOL=/usr/local/bin + + +for (( i = 0; i < 16; i++)) +do + if test -x /sys/class/vtconsole/vtcon$i; then + if [ `cat /sys/class/vtconsole/vtcon$i/name | grep -c "frame buffer"` \ + = 1 ]; then + if test -x $VBETOOL/vbetool; then + echo Unbinding vtcon$i + $VBETOOL/vbetool vbestate restore < $VGASTATE + echo 0 > /sys/class/vtconsole/vtcon$i/bind + fi + fi + fi +done + +--------------------------------------------------------------------------- +#!/bin/bash +# Bind fbcon + +for (( i = 0; i < 16; i++)) +do + if test -x /sys/class/vtconsole/vtcon$i; then + if [ `cat /sys/class/vtconsole/vtcon$i/name | grep -c "frame buffer"` \ + = 1 ]; then + echo Unbinding vtcon$i + echo 1 > /sys/class/vtconsole/vtcon$i/bind + fi + fi +done +--------------------------------------------------------------------------- -- Antonino Daplas <adaplas@pol.net> |