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Before posting my question, videos in MP4 format did not work. Later, I re-installed UT with the graphic installer (without erasing the user data). So I tested an MKV video, and it worked ! So I re-tried MP4 videos and all them worked !
@TheKit Your fix has been applied on surya kernel by @ywmaa. Users have reported on Telegram that UI freeze are gone.
For information, before closing this thread :
The flickering issue has been fixed in 20.04 devel channel :
https://gitlab.com/ubports/porting/community-ports/android10/xiaomi-poco-x3/xiaomi-surya/-/commit/9d36e8d5986b2bf21afed7feff46baaa7c7535c9
Thanks to @_Joao_ and everybody on pocox3 telegram channel for their help
@eheintzmann
Yes now it works. Is ubuntu tocuh 20.04 not yet available for the poco x3 nfc?