Ubuntu 20.04 Beta BTRFS compression & Intel GPU crashing

Soldato
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I'm currently using the following to compress the BTRFS filesystem with ZLIB:

Code:
sudo btrfs filesystem defragment -r -v -czlib /

I know that ZLIB has different compression levels but I don't know how to raise it to a higher level? I've also noticed that, as the compression is running, if I refresh the files view to look at the current free space it rises from 220mb to 4gb, but then starts falling again and by the time the operation has done the whole drive it's down to 2.2gb, so something is growing in size when compressed!

Does anyone know how to change the compression level and how to stop it expanding files when compressing some of them?

A secondary issue I have is that anything using OpenGL (Steam, WebGL, 0 A.D etc) seems to hang the system? It's a Pentium N4200 Lenovo netbook with Intel HD 505 graphics.

Thanks
 
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