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 &lt;TITLE&gt;The Linux keyboard and console HOWTO: Changing the video mode&lt;/TITLE&gt;
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&lt;H2&gt;&lt;A NAME=&quot;s16&quot;&gt;16. Changing the video mode&lt;/A&gt;&lt;/H2&gt;

&lt;P&gt;
&lt;!--
console!changing video modes
--&gt;

&lt;!--
video modes, changing
--&gt;

&lt;!--
resolution, changing
--&gt;
&lt;P&gt;As far as I know there are 6 ways to change resolution:
&lt;P&gt;1. At compile time: change the line
&lt;BLOCKQUOTE&gt;&lt;CODE&gt;
&lt;PRE&gt;
        SVGA_MODE=      -DSVGA_MODE=NORMAL_VGA
&lt;/PRE&gt;
&lt;/CODE&gt;&lt;/BLOCKQUOTE&gt;

in &lt;CODE&gt;/usr/src/linux/Makefile&lt;/CODE&gt;.
&lt;P&gt;1A. After compilation: use &lt;CODE&gt;rdev -v&lt;/CODE&gt; - a terrible hack, but it exists.
&lt;P&gt;2. At boot time: put &lt;CODE&gt;vga=ask&lt;/CODE&gt; in the lilo config file, and lilo will
ask you what video mode you want. Once you know, put &lt;CODE&gt;vga=&lt;/CODE&gt;mypreference.
&lt;P&gt;3. At run time:
A. Use the &lt;CODE&gt;resizecons&lt;/CODE&gt; command. (This is a very primitive wrapper around
the VT_RESIZE ioctl.)
B. Use the &lt;CODE&gt;SVGATextMode&lt;/CODE&gt; command. (This is a less primitive wrapper around
the VT_RESIZE ioctl.)
&lt;P&gt;4. Not &quot;on the console&quot;:
Under &lt;CODE&gt;dosemu&lt;/CODE&gt;, or with svgalib etc. you can change the hardware video mode
without the console driver being aware of it. Sometimes this is useful in
getting &lt;CODE&gt;resizecons&lt;/CODE&gt; or &lt;CODE&gt;SVGATextMode&lt;/CODE&gt; set up: use &lt;CODE&gt;dosemu&lt;/CODE&gt; and some
DOS program to get into the desired videomode, dump (say from another VT) the
contents of all video hardware registers, and use that in the initialization
that &lt;CODE&gt;resizecons&lt;/CODE&gt; and &lt;CODE&gt;SVGATextMode&lt;/CODE&gt; require.
In some cases where the video mode has gotten into some unusable state,
starting &lt;CODE&gt;dosemu&lt;/CODE&gt;, relying on the BIOS to set up the video mode, and then
killing &lt;CODE&gt;dosemu&lt;/CODE&gt; (with &lt;CODE&gt;kill -9&lt;/CODE&gt;), is the easiest way to get into shape
again.
&lt;P&gt;
&lt;H2&gt;&lt;A NAME=&quot;ss16.1&quot;&gt;16.1 Instructions for the use of resizecons&lt;/A&gt;
&lt;/H2&gt;

&lt;P&gt;
&lt;!--
resizecons program
--&gt;
&lt;P&gt;Get svgalib and compile the program &lt;CODE&gt;restoretextmode&lt;/CODE&gt;.
Boot up your machine in all possible video modes
(using &lt;CODE&gt;vga=ask&lt;/CODE&gt; in the lilo config file), and write
the video hardware register contents to files CxR
(C=cols, R=rows), e.g., 80x25, 132x44, etc.
Put these files in &lt;CODE&gt;/usr/lib/kbd/videomodes&lt;/CODE&gt;.
Now &lt;CODE&gt;resizecons 132x44&lt;/CODE&gt; will change videomode for you
(and send SIGWINCH to all processes that need to know
about this, and load another font if necessary).
&lt;P&gt;At present, &lt;CODE&gt;resizecons&lt;/CODE&gt; only succeeds when there is memory enough
for both the old and the new consoles at the same time.
&lt;P&gt;
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