1<refentry id="vidioc-log-status"> 2 <refmeta> 3 <refentrytitle>ioctl VIDIOC_LOG_STATUS</refentrytitle> 4 &manvol; 5 </refmeta> 6 7 <refnamediv> 8 <refname>VIDIOC_LOG_STATUS</refname> 9 <refpurpose>Log driver status information</refpurpose> 10 </refnamediv> 11 12 <refsynopsisdiv> 13 <funcsynopsis> 14 <funcprototype> 15 <funcdef>int <function>ioctl</function></funcdef> 16 <paramdef>int <parameter>fd</parameter></paramdef> 17 <paramdef>int <parameter>request</parameter></paramdef> 18 </funcprototype> 19 </funcsynopsis> 20 </refsynopsisdiv> 21 22 <refsect1> 23 <title>Description</title> 24 25 <para>As the video/audio devices become more complicated it 26becomes harder to debug problems. When this ioctl is called the driver 27will output the current device status to the kernel log. This is 28particular useful when dealing with problems like no sound, no video 29and incorrectly tuned channels. Also many modern devices autodetect 30video and audio standards and this ioctl will report what the device 31thinks what the standard is. Mismatches may give an indication where 32the problem is.</para> 33 34 <para>This ioctl is optional and not all drivers support it. It 35was introduced in Linux 2.6.15.</para> 36 </refsect1> 37 38 <refsect1> 39 &return-value; 40 41 <variablelist> 42 <varlistentry> 43 <term><errorcode>EINVAL</errorcode></term> 44 <listitem> 45 <para>The driver does not support this ioctl.</para> 46 </listitem> 47 </varlistentry> 48 </variablelist> 49 </refsect1> 50</refentry> 51 52<!-- 53Local Variables: 54mode: sgml 55sgml-parent-document: "v4l2.sgml" 56indent-tabs-mode: nil 57End: 58--> 59