Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!

Sign In Register

Quick Links

Categories

Supported by

Screen tearing *sometimes* -- behavior inconsistent, even with psychopy

jtparjtpar
in OpenSesame

Hi all,

I tried the little 'flicker' experiment that's at the bottom of the documentation page on timing, to test whether v-sync is on or not for my monitors. I'm not sure how to interpret my findings... here's what I've found:

  • sometimes it seems to work without any horizontal lines, but only if i run it in one of the two monitors... and which monitor works changes when i unplug and replug them... but not consistently
  • the rate at which the horizontal line "drifts" seems to vary. The direction of drift is also different between the two. One monitor (which I'll call monitor A) has the line always drifting up, while the other (monitor B ) has it always drifting down.
  • because the rate of drift varies, i wonder if the runs on which I thought there were no horizontal lines just had a very slow drift rate and i didn't wait long enough.
  • on a handful of runs, i would get a horizontal line that doesn't drift at all, but 'hangs" about 2cm from the top of the screen (this happened for both monitors at least once)
  • These patterns appear to occur when using either the xpyriment or psycho backends (I didn't try with legacy)

I think maybe the short answer is that i just need to find a way to force v-sync 100% of the time, but I was wondering if my observation that v-sync seemed to be enabled some of the time could make sense?

I apologize for what I think is probably a very confusing post. Any insights at all would be hugely appreciated!

Thanks,
-Jonathan

Comments

  • JarikJarik

    Hi Jonathan,

    sometimes it seems to work without any horizontal lines, but only if i run it in one of the two monitors... and which monitor works changes when i unplug and replug them... but not consistently

    Only one monitor can be the primary monitor and that one is in sync with v-sync. :) In our EEG labs we see the secondary monitor, where the researchers can track how the subject is doing, is out of sync (shows the horizontal lines). The inconsistency might be explained because video cards ale 'intelligent' these days en set the secondary monitor to be the primary monitor as soon as you unplug the first primary monitor.

    I never looked into the patterns, behavior etc. of the lines on the secondary monitor. We just make sure subjects are looking at monitor number 1 (the primary monitor)!

    Hope this helps,
    Jarik

  • jtparjtpar

    Thanks, Jarik! It does help.

    I'll play around with it and see if I can get it to a stable configuration... but you may hear from me again :p

Sign In or Register to comment.
Sebastiaan Mathôt » v2.0.18 » Copyright 2011 — 2019 » Vanilla flavored » License

agen judi bola , sportbook, casino, togel, number game, singapore, tangkas, basket, slot, poker, dominoqq, agen bola. Semua permainan bisa dimainkan hanya dengan 1 ID. minimal deposit 50.000 ,- bonus cashback hingga 10% , diskon togel hingga 66% bisa bermain di android dan IOS kapanpun dan dimana pun. poker , bandarq , aduq, domino qq , dominobet. Semua permainan bisa dimainkan hanya dengan 1 ID. minimal deposit 10.000 ,- bonus turnover 0.5% dan bonus referral 20%. Bonus - bonus yang dihadirkan bisa terbilang cukup tinggi dan memuaskan, anda hanya perlu memasang pada situs yang memberikan bursa pasaran terbaik yaitu http://45.77.173.118/ Bola168. Situs penyedia segala jenis permainan poker online kini semakin banyak ditemukan di Internet, salah satunya TahunQQ merupakan situs Agen Judi Domino66 Dan BandarQ Terpercaya yang mampu memberikan banyak provit bagi bettornya. Permainan Yang Di Sediakan Dewi365 Juga sangat banyak Dan menarik dan Peluang untuk memenangkan Taruhan Judi online ini juga sangat mudah . Mainkan Segera Taruhan Sportbook anda bersama Agen Judi Bola Bersama Dewi365 Kemenangan Anda Berapa pun akan Terbayarkan. Tersedia 9 macam permainan seru yang bisa kamu mainkan hanya di dalam 1 ID saja. Permainan seru yang tersedia seperti Poker, Domino QQ Dan juga BandarQ Online. Semuanya tersedia lengkap hanya di ABGQQ. Situs ABGQQ sangat mudah dimenangkan, kamu juga akan mendapatkan mega bonus dan setiap pemain berhak mendapatkan cashback mingguan. ABGQQ juga telah diakui sebagai Bandar Domino Online yang menjamin sistem FAIR PLAY disetiap permainan yang bisa dimainkan dengan deposit minimal hanya Rp.25.000. DEWI365 adalah Bandar Judi Bola Terpercaya & resmi dan terpercaya di indonesia. Situs judi bola ini menyediakan fasilitas bagi anda untuk dapat bermain memainkan permainan judi bola. Didalam situs ini memiliki berbagai permainan taruhan bola terlengkap seperti Sbobet, yang membuat DEWI365 menjadi situs judi bola terbaik dan terpercaya di Indonesia. Tentunya sebagai situs yang bertugas sebagai Bandar Poker Online pastinya akan berusaha untuk menjaga semua informasi dan keamanan yang terdapat di POKERQQ13. Kotakqq adalah situs Judi Poker Online Terpercayayang menyediakan 9 jenis permainan sakong online, dominoqq, domino99, bandarq, bandar ceme, aduq, poker online, bandar poker, balak66, perang baccarat, dan capsa susun. Dengan minimal deposit withdraw 15.000 Anda sudah bisa memainkan semua permaina pkv games di situs kami. Jackpot besar,Win rate tinggi, Fair play, PKV Games