<div dir="ltr">What about keeping display power managment off<div><a href="https://wiki.archlinux.org/index.php/Display_Power_Management_Signaling">https://wiki.archlinux.org/index.php/Display_Power_Management_Signaling</a><br>
</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Mon, Jul 14, 2014 at 9:17 AM, NickS <span dir="ltr">&lt;<a href="mailto:nicks272@yahoo.co.uk" target="_blank">nicks272@yahoo.co.uk</a>&gt;</span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div style="color:#000;background-color:#fff;font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:10pt">
<div class=""><div><font color="black" face="Verdana,Arial,Helvetica"><font color="black" face="Verdana,Arial,Helvetica">&gt; Actually, after re-reading the post, the correct answer for <br clear="none">&gt; your particular problem may be to add <br clear="none">
 &gt; <br clear="none">  &gt; Option &quot;UseHotplugEvents&quot; &quot;False&quot; <br clear="none"> &gt;<br clear="none">&gt; to your xorg.conf (or equivalent) file. <br clear="none"></font></font></div><div style="color:rgb(0,0,0);font-size:13px;font-family:Verdana,Arial,Helvetica;background-color:transparent;font-style:normal">
<br clear="none"></div></div><div style="color:rgb(0,0,0);font-size:13px;font-family:Verdana,Arial,Helvetica;background-color:transparent;font-style:normal"><font color="black" face="Verdana,Arial,Helvetica"><font color="black" face="Verdana,Arial,Helvetica">Thanks
 Gary, I&#39;d not come across that before. I tried it (and lots of other 
fiddling with xorg.conf) over the weekend and unfortunately it doesn&#39;t 
seem to work. Here&#39;s my current /etc/X11/xorg.conf file:</font></font></div><div style="color:rgb(0,0,0);font-size:13px;font-family:Verdana,Arial,Helvetica;background-color:transparent;font-style:normal"><br clear="none">
</div><div style="color:rgb(0,0,0);font-size:13px;font-family:Verdana,Arial,Helvetica;background-color:transparent;font-style:normal">    Section &quot;Monitor&quot;<br clear="none">        Identifier    &quot;HDMI-0&quot;<br clear="none">
        VendorName    &quot;LG&quot;<br clear="none">        ModelName    &quot;42LM620T&quot;<br clear="none">        Option        &quot;UseHotplugEvents&quot;    &quot;false&quot;<br clear="none">        Option        &quot;Primary&quot;        &quot;true&quot;</div>
<div style="color:rgb(0,0,0);font-size:13px;font-family:Verdana,Arial,Helvetica;background-color:transparent;font-style:normal">        Option        &quot;DPMS&quot;        &quot;false&quot;<br clear="none">    EndSection<br clear="none">
<br clear="none">    Section &quot;Screen&quot;<br clear="none">        Identifier &quot;Screen0&quot;<br clear="none">        Monitor    &quot;HDMI-0&quot;<br clear="none">    EndSection<br clear="none"></div><div style="color:rgb(0,0,0);font-size:13px;font-family:Verdana,Arial,Helvetica;background-color:transparent;font-style:normal">
<br clear="none"></div><div style="color:rgb(0,0,0);font-size:13px;font-family:Verdana,Arial,Helvetica;background-color:transparent;font-style:normal">which appears to be detected:</div><div style="color:rgb(0,0,0);font-size:13px;font-family:Verdana,Arial,Helvetica;background-color:transparent;font-style:normal">
<br clear="none"></div><div style="color:rgb(0,0,0);font-size:13px;font-family:Verdana,Arial,Helvetica;background-color:transparent;font-style:normal">    ~$ grep
 &quot;xorg.conf&quot; /var/log/Xorg.0.log<br clear="none">    [  1114.119] (==) Using config file: &quot;/etc/X11/xorg.conf&quot;<br clear="none"></div><div style="color:rgb(0,0,0);font-size:13px;font-family:Verdana,Arial,Helvetica;background-color:transparent;font-style:normal">
<br clear="none"></div><font>but isn&#39;t having the desired effect.<br clear="none"><br clear="none">I suspect that the &quot;</font>UseHotplugEvents&quot;
 option is NVidia specific, as I can&#39;t find any mention of it in the 
manpages for  xorg.conf  or  radeon . It looks like EDID options (like 
&quot;UseEDID&quot;) are nvidia specific too, so xorg.conf with ATI is looking 
like a dead-end :(<br clear="none"><br clear="none">I&#39;ll
 keep searching and trying things (including your EDID kernel 
suggestion), but in the end I may have no option but to revert back to a
 legacy kernel and proprietary ATI driver that
 supports my <font color="black" face="Verdana,Arial,Helvetica"><font color="black" face="Verdana,Arial,Helvetica">Radeon HD 4250. In the meantime any other so</font></font>lutions would be most welcome. Thanks,<br clear="none">
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<br></blockquote></div><br></div>