I run xfwm4-git (g80453816, XPresent and Epoxy enabled, aee8b25 reverted because bug 13954), Intel GM45, Xorg modesetting driver. With only my laptop's primary screen active tear-free compositing is great (thanks for XPresent/OpenGL support!). But when I plug a secondary monitor (VGA or HDMI), I get horrible tearing on both screens. How can I debug this?
I'm also experiencing tearing in both monitors after switching from xf86-video-intel to modesetting. While using the intel driver, from time to time the active window was blinking, now that glitch is gone but tearing is back, it was minimal and only affected the secondary monitor. As described by Marcos, it only occurs when the secondary monitor is active, when just the primary is in use I get no tearing. Specs: Arch Linux 64-bit xfwm4 4.13.0 (rev a46bb00, from AUR) Build configuration and supported features: - Startup notification support: Yes - XSync support: Yes - Render support: Yes - Xrandr support: Yes - Xpresent support: No - Embedded compositor: Yes - Epoxy support: Yes - KDE systray proxy (deprecated): No
I have XPresent enabled here on Arch. You need libxpresent from AUR (https://aur.archlinux.org/packages/libxpresent). This is xfwm4 version 4.13.0git.80453816 (revision 80453816) for Xfce 4.12 Released under the terms of the GNU General Public License. Compiled against GTK+-2.24.31, using GTK+-2.24.31. Build configuration and supported features: - Startup notification support: Yes - XSync support: Yes - Render support: Yes - Xrandr support: Yes - Xpresent support: Yes - Embedded compositor: Yes - Epoxy support: Yes - KDE systray proxy (deprecated): No
I was able to build with XPresent but it made no difference.
Could be an issue with the modesettings driver as well.
I'm having the same issue with two monitors and screen tearing. System: Xubuntu 16.04/18.04 with an Nvidia GeForce card This is xfwm4 version 4.12.3 (revision 7fdcb53) for Xfce 4.12 Released under the terms of the GNU General Public License. Compiled against GTK+-2.24.30, using GTK+-2.24.30. Build configuration and supported features: - Startup notification support: Yes - XSync support: Yes - Render support: Yes - Xrandr support: Yes - Embedded compositor: Yes - KDE systray proxy (deprecated): No I tried a couple of things mainly related to settings on the nvidia driver, but none of them worked with both screens active.
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