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    <font size="+2" face="Liberation Sans">For the curious, I have
      resolved the situation for now by removing the nvidia drivers and
      also blacklisting nouveau.  This leaves only the intel i915 driver
      using the integrated intel graphics (HD4600).  So the nvidia GT
      730M is unused.</font><font size="+2" face="Liberation Sans"> 
      This notebook uses Optimus technology, meaning the nvidia card
      cannot be used independently of the intel integrated GPU.</font><font
      size="+2" face="Liberation Sans">  I am hoping that using only the
      intel GPU will give acceptable screen quality.  For this Thinkpad
      T440p, the nvidia-driver should probably be  nvidia-legacy390,
      built with GLVND="no" and also use the "pass-through" xorg
      settings from 
<a class="moz-txt-link-freetext" href="http://us.download.nvidia.com/XFree86/Linux-x86_64/390.132/README/randr14.html">http://us.download.nvidia.com/XFree86/Linux-x86_64/390.132/README/randr14.html</a>. 
      I think my issues were caused by the nvidia OpenGL replacement
      libraries not working with Qt5.</font><br>
    <br>
    <div class="moz-cite-prefix">On 3/22/20 1:16 PM, Kevin McCormick
      wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:e5171e72-97f4-06dc-005b-c36197f6a447@fastmail.fm">
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
      <font size="+2" face="Liberation Sans">Further information:
        removed the nvidia-kernel and nvidia-driver packages</font><font
        size="+2" face="Liberation Sans"><font face="Liberation Sans">
          (440.59) and xf86-video-nouveau-blacklist package.  Now
          zoom-linux and kde seem to run fine.  Problem is display
          quality is far lower than when nvidia was installed. 
          Apparently, xorg was unloading nvidia and loading nouveau
          regardless of blacklist, shown in Xorg.0.log, but the nvidia
          libraries are so much better.  When I used
          /etc/X11/xorg.conf.d/10-nvidia.conf there was a crash with X
          regardless of window manager, so the issue is plainly using
          the wrong nvidia driver.  When I tried to manually use the
          NVIDIA-Linux***.run program, it claimed there was a kernel
          module present, so I halted at that point.   The nvidia README
          lists possible library conflicts, which is a problem for me. 
          How does one package the 418.1130 driver and is nvidia-switch
          necessary?</font></font><br>
      <br>
      <div class="moz-cite-prefix">On 3/22/20 7:58 AM, Kevin McCormick
        wrote:<br>
      </div>
      <blockquote type="cite"
        cite="mid:5c957f7a-03ef-be69-eb87-bbe6e359c7a5@fastmail.fm">
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        <font size="+2" face="Liberation Sans">I should also add that
          kde will not start.  The splash screen appears, but then
          crashes to a black screen with the cursor in the upper left
          and no keyboard or mouse response.  Computer must be powered
          off by pressing the power button for 4 sec.  I tried "export
          KDE_DEBUG=True" but cannot find a dump file.  Using fluxbox is
          fine.</font><br>
        <br>
        <div class="moz-cite-prefix">On 3/21/20 7:27 PM, Kevin McCormick
          wrote:<br>
        </div>
        <blockquote type="cite"
          cite="mid:96d1796e-b590-9d68-74d9-bf981d21b5d4@fastmail.fm">
          <meta http-equiv="Content-Type" content="text/html;
            charset=UTF-8">
          <font size="+2" face="Liberation Sans">A little more
            investigation reveals that the recommended driver for
            Geforce GT 730M is 418.1130,  I have 440,59 installed now.<br>
            <br>
          </font><br>
          <div class="moz-cite-prefix">On 3/21/20 5:29 PM, Kevin
            McCormick wrote:<br>
          </div>
          <blockquote type="cite"
            cite="mid:9357b8ff-b6a9-23ba-3ee8-9ccacde29453@fastmail.fm">
            <meta http-equiv="content-type" content="text/html;
              charset=UTF-8">
            <font size="+2"><font face="Noto Sans">My computer: 
                Thinkpad T440p  </font></font><br>
            <font size="+2"><font face="Noto Sans">Slackware 14.2 with
                many packages from SBo.<br>
              </font></font><font size="+2"><font face="Noto Sans">video:
                Nvidia GeForce GT 730M and Intel i5-4200M with GPU<br>
                I mention the video because it may have something to do
                with the problem.<br>
                <br>
                zoom-linux gives a flash on the screen and crashes.<br>
                <br>
                $ zoom-linux &<br>
                . . .<br>
                Graphics Card Info:: <br>
                Zoom package arch is 64bit, runing OS arch is x86_64<br>
                AppIconMgr::systemDesktopName log Desktop Name:  <br>
                QGLXContext: Failed to create dummy context<br>
                qt.scenegraph.general: QSG: basic render loop<br>
                qt.scenegraph.general: Using sg animation driver<br>
                qt.svg: link image0 hasn't been detected!<br>
                qt.svg: :/images/wechat.svg:10:6: Could not resolve
                property: pattern0<br>
                Failed to create OpenGL context for format
                QSurfaceFormat(version 2.0, options
                QFlags<QSurfaceFormat::FormatOption>(),
                depthBufferSize 24, redBufferSize -1, greenBufferSize
                -1, blueBufferSize -1, alphaBufferSize 8,
                stencilBufferSize 8, samples -1, swapBehavior
                QSurfaceFormat::SwapBehavior(DoubleBuffer), swapInterval
                1, profile 
                QSurfaceFormat::OpenGLContextProfile(NoProfile)) <br>
                ZoomLauncher: new dump generated from pid 20534, path:
                /home/XXXXX/.zoom/logs/1524b74b-f164-461a-8ad868b2-dbb81244.dmp<br>
                $HOME = /home/XXXXX<br>
                sh: line 1: 20534 Aborted                
                /opt/zoom-linux/zoom ""<br>
                success to create child process,status is 34304.<br>
                zoom exited normally.<br>
                Something went wrong while running zoom,exit code is
                134.<br>
                ZoomLauncher exit.<br>
                <br>
                I can't find anything helpful on this.<br>
                <br>
                Thanks<br>
              </font></font> <br>
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