https://bugs.freedesktop.org/show_bug.cgi?id=74784
--- Comment #2 from Bruno Jiménez brunojimen@gmail.com --- Yes, I am using the llvm backend (you mean the --enable-r600-llvm-compiler configure option, don't you? )
I will compile a mesa package without that option, and tonight I will see if it continues to happend and I will attach the xorg and dmesg logs.
And yes, it is a regression, although the best date I can give as not happening is the 29th of December.
If disabling the llvm backend doesn't help, I will start bisecting.
Thanks for all!