<html><head></head><body style="zoom: 0%;"><div dir="auto">Here's another good test: reverse the monitors.<br><br></div>
<div dir="auto">Does the flicker follow the monitor or stay in the same position?<br><br></div>
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<b>From:</b> Evan Leibovitch via talk <talk@gtalug.org><br>
<b>Sent:</b> Sat Apr 03 16:54:31 EDT 2021<br>
<b>To:</b> "D. Hugh Redelmeier" <hugh@mimosa.com><br>
<b>Cc:</b> Evan Leibovitch <evan@telly.org>, Evan Leibovitch via talk <talk@gtalug.org><br>
<b>Subject:</b> Re: [GTALUG] flickering [was Has the graphics-card world gone mad?]<br>
</talk@gtalug.org></evan@telly.org></hugh@mimosa.com></talk@gtalug.org></div>
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<div dir="ltr"><div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif;color:#0b5394">Sorry, just saw this buried under a whole bunch of crap. Thanks for the offer of help.<br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:#0b5394"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:#0b5394">Here is the config.</div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:#0b5394">Once ran Linux and was driving me crazy, now runs Windows.<br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:#0b5394"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:#0b5394">The monitors: Two identical 28" Samsung 4K monitors
(model U28E590D), mounted vertically.</div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:#0b5394">The video card has one DVI, one Displayport (connected to the right screen) and one HDMI (connected to the left screen).<br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:#0b5394"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:#0b5394"></div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:#0b5394"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:#0b5394">When the system boots up (ie, the motherboard logo and "press DEL for setup") that shows up on the right screen only.<br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:#0b5394">OS Login right screen only.</div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:#0b5394">Once logged in the second screen comes alive, configured side by side such that the wallpaper is scaled to fit both screens so it looks like one screen (except for the bezel)..<br>I can scale a window across both screens.<br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;color:#0b5394">So far, all driver settings are on default. The Windows app for the Radeon has many settings I don't understand.<br></div></div><div class="gmail_quote"><br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
What *exactly* do you mean by flickering?<br></blockquote><div><br></div><div><div style="font-family:tahoma,sans-serif;color:rgb(11,83,148)" class="gmail_default">The right (displayport) monitor is solid and reliable.</div><div style="font-family:tahoma,sans-serif;color:rgb(11,83,148)" class="gmail_default"><br></div><div style="font-family:tahoma,sans-serif;color:rgb(11,83,148)" class="gmail_default">The left (HDMI) screen will (randomly to me) do one of a few things:<br></div><div style="font-family:tahoma,sans-serif;color:rgb(11,83,148)" class="gmail_default"><ol><li>Go off (the monitor reports lost signal) and back on after about 1-2 seconds.<br><br></li><li>Go off (no signal) for 3-4 seconds and then back on, briefly to flat green or static and then normal.</li></ol><div>Frequency appears random, averaging about 5-10 per hour, slightly more frequent if I am watching video (either youtube on a browser or VLC locally).
Scenario 1 above (just blank) happens far more frequently than #2, but #2 happens enough to be noticeable.In the time it's taken me to write this I've had three of #1 and one of #2<br></div></div><br></div><div><div style="font-family:tahoma,sans-serif;color:rgb(11,83,148)" class="gmail_default">
I've tried different cables, no difference.</div><div> </div></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
What loads cause flickering to happen?<br></blockquote><div><br></div><div><div style="font-family:tahoma,sans-serif;color:rgb(11,83,148)" class="gmail_default">It will happen when I'm not doing anything. I've just now run a not-too-taxing game using Steam (pinball) on each screen, no difference.</div><div style="font-family:tahoma,sans-serif;color:rgb(11,83,148)" class="gmail_default"><br></div></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
If you force the monitors to a reduced resolution does the flicker go<span class="gmail_default" style="font-family:tahoma,sans-serif;color:rgb(11,83,148)"> </span>away?<br></blockquote><div><br></div><div><div style="font-family:tahoma,sans-serif;color:rgb(11,83,148)" class="gmail_default">TBH, haven't tried that.</div><div style="font-family:tahoma,sans-serif;color:rgb(11,83,148)" class="gmail_default"><br></div><div style="font-family:tahoma,sans-serif;color:rgb(11,83,148)" class="gmail_default">Is any of this helpful?</div><div style="font-family:tahoma,sans-serif;color:rgb(11,83,148)" class="gmail_default"><br></div><div style="font-family:tahoma,sans-serif;color:rgb(11,83,148)" class="gmail_default">- Evan</div><div style="font-family:tahoma,sans-serif;color:rgb(11,83,148)" class="gmail_default"><br></div></div>
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