(In reply to iive from comment #69)

Just tried mesa_glthread=false RADEON_THREAD=false MESA_DEBUG=flush and got the
same results. The others seem a lot more complex: I might try them later, but
currently I'm very busy and it's difficult to organize myself accordingly. I
wish I had a better way of helping to understand this issue, as I really need
to get it fixed, sadly I feel stuck myself at the moment.