topic Re: iMX6 screen tearing artifacts when using Linux/X11/Chromium in i.MX Processors

iMX6 screen tearing artifacts when using Linux/X11/Chromium

gabrielliseanu — Tue, 12 Nov 2013 13:29:08 GMT

Hello,

when using Linux/X11/Chrome on a SABRE Dual Lite board, screen tearing artifacts are encountered within the broswer. Following setup is used:

- Yocto Release 1.5, including

- Linux imx6dlsabresd 3.0.35-4.1.0+yocto+gbdde708 ( only one cpu activated )

- X.Org X Server 1.14.0

- Chrome Version 32.0.1664.3 ( 227606 ), with all GPU acceleration options enabled

When the Video Tearing test - YouTube is displayed inside the browser, tearing artifacts are visible. Tearing artifacts are also visible when swiping html5 pages.

If the same URL ( the YouTube tearing video ) is displayed on the SABRE Dual Lite board using an Android 4.2.2 image + Chrome 29.0.1547.59 no tearing artifacts are visible.

Is this behaviour known ? Are there any hints available, regarding the configuration of the subsystems preventing the tearing artifacts mentioned above ?

Any help would be highly appreciated.

Kind regards,

Gabriel.

Re: iMX6 screen tearing artifacts when using Linux/X11/Chromium

LeonardoSandova — Tue, 12 Nov 2013 16:20:13 GMT

Hi Gabriel.

If the stream is coming from youtube (which is a flash container), the VPU is the one to be used. Do you know if VPU is somehow used? check the log and see if there is any gstreamer trace. If not, the all decoding is being done by SW. Can you try firefox?

Leo

Re: iMX6 screen tearing artifacts when using Linux/X11/Chromium

gabrielliseanu — Wed, 13 Nov 2013 12:49:55 GMT

Hi Leo,

the artifacts I mentioned above are also visible when displaying a local stored html page in the browser and performing horizontal scrolling actions. In this case no VPU is involved.

I have attached two links to this entry. The first link shows a short video with the mentioned tearing artifacts. The second link includes the html package I used on the SABRE board to record the video.

1. https://www.dropbox.com/s/2kv0mnj1vhcsaow/Tearing.MOV

2. https://www.dropbox.com/s/f47mzhsp6md8pgz/public_html_swiper_lib_eval.7z

Installing the public_html_swiper_lib_eval package:

1. Uncompress the public_html_swiper_lib_eval.7z file

2. copy the public_html_swiper_lib_eval folder in the root directory of the SABRE board

3. start the shell script /public_html_swiper_lib_eval/start.sh on the SABRE board

As result of the start.sh script, a Chrome instance is launched and the file:///public_html_swiper_lib_eval/layout.html URL is displayed inside the browser. The page can be scrolled horizontally by using swiping gestures or with a mouse attached to the USB OTG connector of the SABRE Dual Lite board. The tearing artifacts are immediately visible.

As alternative the public_html_swiper_lib_eval can be exposed through a Web server to the browser running on the SABRE board.

I rather assume the behaviour is related to the fact that the display content is updated during v-sync.

Also attached a third link, showing the behaviour on an Android 4.2.2 image running on the same SABRE Dual Lite board https://www.dropbox.com/s/e0n4kptjehigmt8/No_Tearing_Android_4.2.2.MOV , where no screen tearing artifacts are visible.

Kind regards,

Gabriel.

Re: iMX6 screen tearing artifacts when using Linux/X11/Chromium

karina_valencia — Thu, 12 Dec 2013 14:59:04 GMT

AndreSilva can you help on this case?

Re: iMX6 screen tearing artifacts when using Linux/X11/Chromium

andre_silva — Fri, 13 Dec 2013 16:29:12 GMT

Hi Gabriel,

could you disable all the GPU in this application and use the software fallback to see if the issue still persists ?

thanks,

Andre

Re: iMX6 screen tearing artifacts when using Linux/X11/Chromium

gabrielliseanu — Mon, 16 Dec 2013 10:15:32 GMT

Hi Andre,

I've disable the GPU, but the tearing artifacts are still there.

Attached 2 screenshots showing the GPU flags used by Chromium. The first with GPU enabled, the second with GPU disabled. As already mentioned, no changes regarding the tearing artifacts between these two options.

Kind regards,

Gabriel.

Re: iMX6 screen tearing artifacts when using Linux/X11/Chromium

andre_silva — Wed, 18 Dec 2013 12:03:27 GMT

Hi Gabriel,

Unfortunately if the issue is not GPU releated I am afraid we are not able to help in this case, Since it works in Android as you said, maybe it is a problem with the Chrome port for Arm Linux.

Maybe you can get more information here: LinuxChromiumArm - chromium - Building Chromium for ARM - An open-source project to help move the web forward. - Goog…

or trying to contact google for more information.

regards,

Andre

Re: Re: iMX6 screen tearing artifacts when using Linux/X11/Chromium

pratikpawar — Sat, 11 Jan 2014 11:41:39 GMT

Hi Gabriel,

I am Pratik. I am using Imx6q based sabrelite board. I am building chromium browser for sabrelite board. I have build fsl-image-gui image from yocto(dylan). Then run chromium browser on top of that. If I go chrome://gpu on URL bar, I didn't get graphics feature for Flash Stage3D,Flash Stage 3D Baseline Profile, Panel Fitting.

I have attached Gpu.html file which I saved by writing chrome://gpu on URL bar . will you please help me in this issue.

& are WebGL based apps on chrome experiment website are working on your browser?

BTW I also got same tearing issue when I test it on my board.

Thanks & Regards,

Pratik