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Tearing with lastest xfwm4 git


Description zygmund 2019-07-02 08:08:47 CEST

A I have tearing again with Intel graphics, issue is strange because only one screen of two has tearing.
Comment 1 Olivier Fourdan editbugs 2019-07-02 08:24:47 CEST
Xpresent or GLX?
Comment 2 zygmund 2019-07-02 08:25:59 CEST
I don't know, default.
Comment 3 Olivier Fourdan editbugs 2019-07-02 08:30:28 CEST
Which driver, intel or modesetting?
Comment 4 zygmund 2019-07-02 08:33:25 CEST
Rather intel driver.
Comment 5 Olivier Fourdan editbugs 2019-07-02 09:06:18 CEST
Have you tried with the modesetting driver instead? (this is default, the intel driver hasn't got any release in years, 2.99.997 was tagged 5 years ago).

xfwm4 relies on either GLX or Xpresent to swap buffers on vsync, if you get tearing, there is not so much it can do.

That said, this could be simply that the two outputs have completely different refresh rates and the driver cannot sync on both simultaneously, you could try changing the refresh rates of your monitors to be closer to see if that makes any difference.

In any case, it works for me, tear free in multi monitor setup on intel (using the modesetting driver), with both Xpresent (with https://gitlab.freedesktop.org/xorg/xserver/commit/6e199e46) and GLX, tested on a few laptops.
Comment 6 zygmund 2019-07-02 09:09:37 CEST
I'm not sure which driver I have, but this tearing is something new, I observed it about 1 or 2 weeks ago, before was ok.
Comment 7 zygmund 2019-07-02 09:10:15 CEST
I'm not sure which driver I have, but this tearing is something new, I observed it about 1 or 2 weeks ago, before was ok.
Comment 8 Olivier Fourdan editbugs 2019-07-02 14:34:58 CEST
Could be https://gitlab.freedesktop.org/xorg/xserver/issues/839
Comment 9 zygmund 2019-07-02 18:02:20 CEST
Graphics:  Device-1: Intel Xeon E3-1200 v2/3rd Gen Core processor Graphics driver: i915 v: kernel 
           Display: x11 server: X.Org 1.20.5 driver: intel unloaded: modesetting resolution: 1920x1200~60Hz, 1920x1200~60Hz 
           OpenGL: renderer: Mesa DRI Intel Ivybridge Desktop v: 4.2 Mesa 19.0.6
Comment 10 Git Bot editbugs 2020-05-29 12:27:07 CEST
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Bug #15665

Reported by:
Reported on: 2019-07-02
Last modified on: 2020-05-29


Olivier Fourdan
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