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On 09/23/2013 11:46 AM, Joakim Gebart wrote:
<blockquote
 cite="mid:CAEVyRBKMksAO+NkRauiUqCt=f71UKy9fYYNb6M0nSy_j8B3hSQ@mail.gmail.com"
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  <div class="gmail_quote">2013/9/22 Alexander Kapshuk <span dir="ltr">&lt;<a
 moz-do-not-send="true" href="mailto:alexander.kapshuk@gmail.com"
 target="_blank">alexander.kapshuk@gmail.com</a>&gt;</span><br>
  <blockquote class="gmail_quote"
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    <div class="h5">On 09/21/2013 06:32 PM, Al wrote:<br>
&gt; Bruce Hill wrote:<br>
&gt;&gt; I have "Use smooth scrolling" checked and no such wavy line
anywhere.<br>
&gt;<br>
&gt; Hmmm....<br>
&gt;<br>
&gt; I just tried Firefox, and get the wavy line when "Use smooth
scolling<br>
&gt; is checked (scrolling with the mouse wheel). It goes away when
unchecked.<br>
&gt;<br>
&gt; Did the same in Thunderbird, and I don't see the wavy line, no
matter<br>
&gt; what the setting.<br>
&gt;<br>
&gt; Al<br>
&gt;<br>
&gt;<br>
    </div>
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Having the "Use smooth scrolling" option unchecked in both Firefox and<br>
Thunderbird seems to have fixed the 'wavy line' problem for me.<br>
    <br>
Thanks.<br>
    <br>
    <br>
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I'm guessing the wavy line that you describe is 'tearing' that appears
when the display is not synced to the framebuffer, i.e. "vsync". I
believe some of the graphics drivers are not even capable of vsync
currently in X11, but I'm not certain.<br>
  <br>
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  <div class="gmail_extra">/JG<br>
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</blockquote>
That sounds right. I just wasn't sure how to best put it into technical
terms.<br>
<br>
Thanks.<br>
<br>
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