(In reply to Michel Dänzer from comment #3) > > Then something like > > startx [...] 2>stderr.txt > > should capture the stderr output in a file. Actually that one drop something, this is with debug+assertion enabled llvm when monitor just gooes to "sleep" after starting firefox... seems like usefull :) ? X: TargetRegisterInfo.cpp:189: virtual const llvm::TargetRegisterClass* llvm::TargetRegisterInfo::getMatchingSuperRegClass(const llvm::TargetRegisterClass*, const llvm::TargetRegisterClass*, unsigned int) const: Assertion `A && B && "Missing register class"' failed.