6760 2014-09-25 10:00:46 +0000 i.MX6: not possible to run X11 without tearing / with proper vsync 2018-01-18 16:13:44 +0000 1 1 7 Build System, Metadata & Runtime BSPs bsps-meta-fsl-arm 1.6 x86 Multiple RESOLVED OBSOLETE Medium normal Future 1 crg7475 otavio angolini richard.purdie Satyanarayana.T --- Regression (Found by QA test) No (bug/feature does not impact docs) oldest_to_newest 45825 0 2139 crg7475 2014-09-25 10:00:46 +0000 Created attachment 2139 HTML example that shows tearing artifacts It is currently not possible to eliminate tearing in X11 with the i.MX6. The attached HTML example shows a white vertical bar, moving horizontally across the screen, against a black screen. On systems with proper vsync support, the bar stays intact during movement. Without vsync, the bar appears to be torn; one half will be "behind" the other. The tearing effect is particularly bad with videos and big screens (think >= 1 meter panels). There, the tearing can be so aggravating, it can become a showstopper. From what I gathered, the X11 output uses single buffering, and adding in vsync required too many hacks. My hope is that for a next release - ideally, 3.10.31 GA - a proper solution might be found. I know Wayland supports vsync, but X11 is still required sometimes, and Wayland performance on the i.MX6 is still worse than the one X11. 45826 1 crg7475 2014-09-25 10:03:07 +0000 Addendum: this happens with all kernel version, all DISTRO_FEATURES (except when you remove x11 from the DISTRO_FEATURES of course), this can be reproduced on any i.MX6 board. 45856 2 angolini 2014-09-25 17:17:56 +0000 "i.MX6 X11 EGL is single buffered and there is no support for VSYNC" "VSYNC support is going to be added in Wayland. eglSwapInterval will be supported for FBDEV and Wayland backends in the upcoming release. So Ozone-wayland can take advantage of this." "export FB_MULTI_BUFFER=2. By doing this server side is VYSNC controlled. The client side support in next release. " Only to document some points raised during this discussion. At the point of this report, we are in daisy with kernel 3.10.17-GA, working for 1.7 with 3.10.17-1.0.1-GA and waiting to merge 3.10.31-beta on 1.8 development cycle. (all info reffers to i.MX6 boards only) 47074 3 Satyanarayana.T 2014-11-18 14:55:06 +0000 Just curious, Is there any way to fix this screen tearing issue on imx6 may be by setting "SyncDraw" setting to false in current source.I tried this but still i see some tear on display. 54953 4 Satyanarayana.T 2015-10-05 05:10:25 +0000 Any thoughts on, when shall this issue gets fixed in this processor.This would help us for a better design approach if we can solve screen tearing issue on x11. For complext design like ours which uses both GPU and CPU at time critical scenarios, this turns out to be better option for us to use (x11+GPU) if this really gets resolved. 79144 5 richard.purdie 2018-01-18 16:13:44 +0000 This has now become an obsolete/wontfix issue. If anyone is going to actively work on this on maintained releases please reopen and change the targets but I'll close it given the current inactivity. 2139 2014-09-25 10:00:46 +0000 2014-09-25 10:00:46 +0000 HTML example that shows tearing artifacts vertical-bar.html text/html 1107 crg7475 PCFET0NUWVBFIGh0bWw+CjxodG1sPgo8aGVhZD4KCTxtZXRhIGNoYXJzZXQ9dXRmLTggLz4KCTx0 aXRsZT5WZXJ0aWNhbCBiYXIgdGVzdDwvdGl0bGU+Cgk8c2NyaXB0IHR5cGU9InRleHQvamF2YXNj cmlwdCIgc3JjPSJodHRwOi8vYWpheC5nb29nbGVhcGlzLmNvbS9hamF4L2xpYnMvanF1ZXJ5LzEu My4yL2pxdWVyeS5taW4uanMiPjwvc2NyaXB0PgoJPCEtLVtpZiBJRV0+CgkJPHNjcmlwdCBzcmM9 Imh0dHA6Ly9odG1sNXNoaXYuZ29vZ2xlY29kZS5jb20vc3ZuL3RydW5rL2h0bWw1LmpzIj48L3Nj cmlwdD4KCTwhW2VuZGlmXS0tPgoJPHNjcmlwdCB0eXBlPSJ0ZXh0L2phdmFzY3JpcHQiPgoKd2lu ZG93LnJlcXVlc3RBbmltRnJhbWUgPSAoZnVuY3Rpb24oKXsKICByZXR1cm4gIHdpbmRvdy5yZXF1 ZXN0QW5pbWF0aW9uRnJhbWUgICAgICAgfHwKICAgICAgICAgIHdpbmRvdy53ZWJraXRSZXF1ZXN0 QW5pbWF0aW9uRnJhbWUgfHwKICAgICAgICAgIHdpbmRvdy5tb3pSZXF1ZXN0QW5pbWF0aW9uRnJh bWUgICAgfHwKICAgICAgICAgIGZ1bmN0aW9uKCBjYWxsYmFjayApewogICAgICAgICAgICB3aW5k b3cuc2V0VGltZW91dChjYWxsYmFjaywgMTAwMCAvIDYwKTsKICAgICAgICAgIH07Cn0pKCk7Cgp2 YXIgeCA9IDA7CnZhciBiYXIgPSBudWxsOwoKKGZ1bmN0aW9uIGFuaW1sb29wKCl7CglyZXF1ZXN0 QW5pbUZyYW1lKGFuaW1sb29wKTsKCglpZiAoYmFyID09PSBudWxsKQoJCWJhciA9IGRvY3VtZW50 LmdldEVsZW1lbnRCeUlkKCdiYXInKTsKCWlmIChiYXIgPT09IG51bGwpCgkJcmV0dXJuOwoKCXgg Kz0gNTA7CglpZiAoeCA+ICh3aW5kb3cuc2NyZWVuLmF2YWlsV2lkdGgpKQoJCXggPSAwOwoJYmFy LnN0eWxlLmxlZnQgPSB4ICsgJ3B4JzsKfSkoKTsKCgk8L3NjcmlwdD4KPC9oZWFkPgo8Ym9keSB3 aWR0aD0iMTAwJSIgaGVpZ2h0PSIxMDAlIiBzdHlsZT0iYmFja2dyb3VuZC1jb2xvcjogYmxhY2s7 Ij4KCjxkaXYgaWQ9ImJhciIgc3R5bGU9ImJhY2tncm91bmQtY29sb3I6IHdoaXRlOyBwb3NpdGlv bjogYWJzb2x1dGU7IGxlZnQ6IDBweDsgdG9wOiAwcHg7IHdpZHRoOiAxMDBweDsgaGVpZ2h0OiAx MDAlOyI+Cgo8L2JvZHk+CjwvaHRtbD4K