Tearing with lastest xfwm4 git

Submitted by zygmund

Assigned to Olivier Fourdan @olivier

Link to original bug (#15665)

Description

Hi,

A I have tearing again with Intel graphics, issue is strange because only one screen of two has tearing.

Version: GIT Master

Olivier Fourdan @olivier said:

Xpresent or GLX?

zygmund said:

I don't know, default.

Olivier Fourdan @olivier said:

Which driver, intel or modesetting?

zygmund said:

Rather intel driver.

Olivier Fourdan @olivier said:

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.

zygmund said:

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.

zygmund said:

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.

Olivier Fourdan @olivier said:

Could be https://gitlab.freedesktop.org/xorg/xserver/issues/839

zygmund said:

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: 1920x120060Hz, 1920x120060Hz OpenGL: renderer: Mesa DRI Intel Ivybridge Desktop v: 4.2 Mesa 19.0.6

added 5. Tearing / Vblank label

added 5. Compositor label

added 5. Multi-Monitor label

No way to contact the reporter with the bugzilla move, so closing. For those having tearing issues with 4.13 and above, changing the vblank to GLX or Xpresent should resolve it. https://git.xfce.org/xfce/xfwm4/tree/COMPOSITOR#n114

closed