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resizecons(8)


NAME

   resizecons - change kernel idea of the console size

SYNOPSIS

   resizecons COLSxROWS
   resizecons -lines ROWS

DESCRIPTION

   The  resizecons  command  tries to change the videomode of the console.
   There are several aspects to this: (a) the kernel must know  about  it,
   (b)  the hardware must know about it, (c) user programs must know about
   it, (d) the console font may have to be adapted.

   (a) The kernel is told about the  change  using  the  ioctl  VT_RESIZE.
   This  causes  the  kernel  to  reallocate console screen memory for all
   virtual consoles, and might fail if there is not  enough  memory.   (In
   that  case,  try  to disallocate some virtual consoles first.)  If this
   ioctl succeeds, but a later step fails (e.g., because you do  not  have
   root permissions), you may be left with a very messy screen.

   The  most  difficult  part  of  this is (b), since it requires detailed
   knowledge of the video card  hardware,  and  the  setting  of  numerous
   registers.  Only  changing  the  number of rows is slightly easier, and
   resizecons will try to do that itself, when given  the  -lines  option.
   (Probably,  root  permission will be required.)  The command resizecons
   COLSxROWS will execute restoretextmode -r COLSxROWS (and hence requires
   that  you  have  svgalib  installed). Here COLSxROWS is a file that was
   created earlier by restoretextmode -w COLSxROWS.   Again,  either  root
   permissions are required, or restoretextmode has to be suid root.

   In order to deal with (c), resizecons does a `stty rows ROWS cols COLS'
   for each active  console  (in  the  range  tty0..tty15),  and  sends  a
   SIGWINCH signal to selection if it finds the file /tmp/selection.pid.

   Finally, (d) is dealt with by executing a setfont command. Most likely,
   the wrong font is loaded, and  you  may  want  to  do  another  setfont
   yourself afterwards.

BUGS

   resizecons  does  not  work on all hardware.  For example, it cannot be
   used on platforms other than x86 and x86_64.  See the fbset(1)  program
   if you are looking for an alternative.

   This  command  used  to  be  called  resize,  but  was renamed to avoid
   conflict with another command with the same name.

SEE ALSO

   setfont(8),  stty(1),  selection(1),  restoretextmode(8),  disalloc(8),
   fbset(1)



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