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I would like to get transparent terminals in i3 under Ubuntu 20.04 with Nvidia drivers 435.21, but I can't get it to work. When I execute picom, I get the following output:

[ 11.11.2020 20:51:24.270 x_fence_sync ERROR ] Failed to trigger the fence (X error 136 XSyncBadFence request 134 minor 15 serial 2033)
[ 11.11.2020 20:51:24.270 paint_all ERROR ] x_fence_sync failed, xrender-sync-fence will be disabled from now on.

When I run picom -f, the windows successfully fade in, so transparency itself is working, but it seems that my terminals can't access it.

Any ideas what the issue could be?

2 Answers 2

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I'm running nvidia driver at the moment as well. I just started picom with --xrender-sync-fence option and that error message has gone away. My full command is

picom --experimental-backends --backend glx --xrender-sync-fence picom help shows

--xrender-sync-fence
  Additionally use X Sync fence to sync clients' draw calls. Needed
  on nvidia-drivers with GLX backend for some users.
``
0

It turns out it was an issue with my terminal configuration. picom works just fine for me, despite the error messages.

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