  Immersed in external magnetic fields ($B$), buckled graphene constitutes an
ideal tabletop setup, manifesting a confluence of time-reversal symmetry
(${\mathcal T}$) breaking Abelian ($B$) and ${\mathcal T}$-preserving
strain-induced internal axial ($b$) magnetic fields. In such a system, here we
numerically compute two-terminal conductance ($G$), and four- as well as
six-terminal Hall conductivity ($\sigma_{xy}$) for spinless fermions. On a flat
graphene ($b=0$), the $B$ field produces quantized plateaus at $G=\pm
|\sigma_{xy}|=(2n+1) e^2/h$, where $n=0,1,2, \cdots$. The strain induced $b$
field lifts the two-fold valley degeneracy of higher Landau levels and leads to
the formation of additional even-integer plateaus at $G=\pm |\sigma_{xy}|=
(2,4,\cdots)e^2/h$, when $B>b$. While the same sequence of plateaus is observed
for $G$ when $b>B$, the numerical computation of $\sigma_{xy}$ in Hall bar
geometries in this regime becomes unstable. A plateau at $G=\sigma_{xy}=0$
always appears with the onset of a charge-density-wave order, causing a
staggered pattern of fermionic density between two sublattices of the honeycomb
lattice.
