dexx is negative when using bandgroup
The test uspp-hyb-k.in test-suite/pw_uspp fails when using band group This is reproducible on Intel Xeon with Intel+MKL and AMD Ryzen with GNU+OpenBLAS. The error is slightly different.
mpirun -np 8 ~/opt/q-e/bin/pw.x -nbgrp 4 -inp uspp-hyb-k.in
uspp-hyb-g also has the same issue.
Edited by Ye Luo