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<TITLE>The Answer Gang 93: Kernel Compiling and Framebuffer Device</TITLE>
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<H3 align="left"><img src="../../gx/dennis/qbubble.gif"
height="50" width="60" alt="(?) " border="0"
>Kernel Compiling and Framebuffer Device</H3>
<p><strong>From Priit Kivisoo
</strong></p>
<p></strong></p>
<p align="right"><strong>Answered By: Benjamin A. Okopnik, Thomas Adam
</strong></p>
<P><STRONG>
Hello.
</STRONG></P>
<P><STRONG>
I have a problem compiling kernel (2.2.19 currently) on
<A HREF="http://www.debian.org/">Debian</A> GNU/Linux 2.2r6. Every time I compile it, after rebooting,
I get messages like:
</STRONG></P>
<pre><strong>depmod: *** Unresolved symbols in /lib/modules/2.2.19/sound/sound.o
</strong></pre>
<blockQuote>
<IMG SRC="../../gx/dennis/bbub.gif" ALT="(!)"
HEIGHT="28" WIDTH="50" BORDER="0"
> [Ben]
</blockQuote>
<blockQuote>
It sounds like the modules are not being installed after the kernel
compilation. I've seen the "standard procedure" fail to do so unless the
original modules subdirectory was renamed or deleted. So, for those
times when you're not sure what's going on, here's Ben's Patented Kernel
Recompile with Tasty Module Sauce on top (all done as root, of course):
</blockQuote>
<p align="center">See attached <tt><a href="../misc/tag/ben-compilekernel.txt">ben-compilekernel.txt</a></tt></p>
<blockQuote>
This assumes that you only have the one kernel source tree installed -
obviously, you'd need to "cd" to the appropriate source directory if you
have more than one - and that your current kernel version is the same as
the one you're running (if it's not, ignore the "version" variable and
type out the right numbers.) I'm also not showing any of the output for
clarity's sake.
</blockQuote>
<blockQuote>
<IMG SRC="../../gx/dennis/bbub.gif" ALT="(!)"
HEIGHT="28" WIDTH="50" BORDER="0"
> [Thomas]
I am wondering whether or not your "modules.dep" file is up to date. As
"root", issue:
</blockQuote>
<blockquote><pre>depmod -a
</pre></blockquote>
<blockQuote>
just to be safe.
</blockQuote>
<blockQuote>
Sound support is usually loaded via a module and those settings are stored
in "<TT>/etc/modules.conf</TT>". Check that those settings are accurate for your
card. As you are running Debian, take a look at:
</blockQuote>
<blockquote><pre>man \1 update-modules
</pre></blockquote>
<blockQuote>
<IMG SRC="../../gx/dennis/bbub.gif" ALT="(!)"
HEIGHT="28" WIDTH="50" BORDER="0"
> [Ben]
Good point, Thomas! Although that's supposed to happen automatically
during boot (Debian does it via "<TT>/etc/init.d/modutils</TT>"), it could fail,
or not run for some reason. If you see a whole bunch of error messages
when you do the above,though, chances are that you've got a mismatched
between your kernel and modules.
</blockQuote>
<P><STRONG>
<IMG SRC="../../gx/dennis/qbub.gif" ALT="(?)"
HEIGHT="28" WIDTH="50" BORDER="0"
>
Also, I was wandering, if someone can tell me, why can't I
use framebuffer device using 32k, It works only with 256 colours
for me... When I use 32k (or 16k), I can't see the cute penguin, not
mentioning X (well, I use XFree86 3.3.11, which came with the distribution,
I have ATI Rage Fury Pro AGP, which SuperProbe can't detect - any
suggestions to that? XFree86 4.* on <A HREF="http://www.slackware.org/">Slackware</A> 8.0.0 can't recognize
it either...). I get message:
</STRONG></P>
<pre><strong>Fatal server error:
fbdevScreenInit: unableto set screen params (Invalid argument)
</strong></pre>
<font color="red"><blockquote><em>At press time, I was unable to reply back to this e-mail. I think the
above error message is as a result of bad modelines that the kernel
cannot handle.
-- Thomas Adam</em></blockquote></font>
<P><STRONG>
<IMG SRC="../../gx/dennis/qbub.gif" ALT="(?)"
HEIGHT="28" WIDTH="50" BORDER="0"
>
Oh, btw, framebuffer worked perfectly on Slackware 8.0.0 - even
1024x768x32k worked fine... And Debian 2.2r6 didn't have framebuffer
compiled in kernel, I compiled it myself - maybe I did something wrong,
even though I tried to follow the 'Framebuffer-HOWTO'.
</STRONG></P>
<blockQuote>
<IMG SRC="../../gx/dennis/bbub.gif" ALT="(!)"
HEIGHT="28" WIDTH="50" BORDER="0"
> [Ben]
</blockQuote>
<blockQuote>
Sorry, framebuffer is outside my area of expertise. Someone else here
might be able to help, though.
</blockQuote>
<blockQuote>
<IMG SRC="../../gx/dennis/bbub.gif" ALT="(!)"
HEIGHT="28" WIDTH="50" BORDER="0"
> [Thomas]
<IMG SRC="../../gx/dennis/smily.gif" ALT=":)"
height="24" width="20" align="middle"> Well, I might
<IMG SRC="../../gx/dennis/smily.gif" ALT=":)"
height="24" width="20" align="middle"> Framebuffer support is in the experimental part of the
kernel, so you have to enable "experimental" in Code Maturity Options (as
I assume you have).
</blockQuote>
<blockQuote>
If you are using Lilo, make sure that your "vga=" line for the appropriate
stanza is set like this:
</blockQuote>
<blockquote><pre>vga=0x317
</pre></blockquote>
<blockQuote>
Then run "<TT>/sbin/lilo</TT>"!!!! That'll give you 1024x786x16 colour bit.
</blockQuote>
<P><STRONG>
<IMG SRC="../../gx/dennis/qbub.gif" ALT="(?)"
HEIGHT="28" WIDTH="50" BORDER="0"
>
Also, I just have to say, that You all at the Gazette, have done
a great job in helping Linux users worldwide... Thank You for that!
</STRONG></P>
<blockQuote>
<IMG SRC="../../gx/dennis/bbub.gif" ALT="(!)"
HEIGHT="28" WIDTH="50" BORDER="0"
> [Ben]
&lt;smile&gt; Thank you, Priit! Much appreciated, and glad you're enjoying the
Gazette.
</blockQuote>
<P><STRONG>
<IMG SRC="../../gx/dennis/qbub.gif" ALT="(?)"
HEIGHT="28" WIDTH="50" BORDER="0"
>
PS! Sorry about the following ad-s from hot.ee, because
I didn't have any mail client available... sry.
</STRONG></P>
<blockQuote>
<IMG SRC="../../gx/dennis/bbub.gif" ALT="(!)"
HEIGHT="28" WIDTH="50" BORDER="0"
> [Ben]
Hey, Estonian ads. Cool. Don't think I'd seen those before... when I
passed through Tallinn 30+ years ago, they didn't have those yet.
<IMG SRC="../../gx/dennis/smily.gif" ALT=":)"
height="24" width="20" align="middle"> I'm
</blockQuote>
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<br>Copyright &copy; 2003
<br>Copying license <A HREF="">http://www.linuxgazette.com/copying.html</A>
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