<p>I'm just throwing out something here:</p>
<p>First off you could try playing around with <a href="http://www.alsa-project.org/main/index.php/HDA_Analyzer" rel="nofollow">http://www.alsa-project.org/main/index.php/HDA_Analyzer</a></p>
<p>Or:</p>
<ul>
<li><p>Go to /sys/devices</p></li>
<li><p>Find the folder containing vendor_name with content Realtek. (probably pciXXX/xx/xx/hwC0D0)</p></li>
<li><p><code>$ echo $MODELNAME > modelname && echo 1 > reconfig</code></p></li>
</ul>
<p>If you get <code>echo: write error: device or resource busy</code>, make sure all audio apps is closed. Try different stuff for MODELNAME. Since you have a Realtek ALC268, try some of these: (from $KERNELSOURCE/Documentation/sound/alsa/HD-Audio-Models.txt)</p>
<pre><code>ALC267/268
quanta-il1 Quanta IL1 mini-notebook
3stack 3-stack model
toshiba Toshiba A205
acer Acer laptops
acer-dmic Acer laptops with digital-mic
acer-aspire Acer Aspire One
dell Dell OEM laptops (Vostro 1200)
zepto Zepto laptops
test for testing/debugging purpose, almost all controls can
adjusted. Appearing only when compiled with
$CONFIG_SND_DEBUG=y
auto auto-config reading BIOS (default)
generic
</code></pre>
<p>I'd try test and generic first</p>
<p>I take in now way responsibility for what this might do. (You might have to reboot a couple times)</p>
