International audienceThe two-user linear deterministic interference channel (LD-IC) with noisy channel-output feedback is fully described by six parameters that correspond to the number of bit-pipes between each transmitter and its corresponding intended receiver, i.e., n11 and n22; between each transmitter and its corresponding non-intended receiver i.e., n12 and n21; and between each receiver and its corresponding transmitter, i.e., n11 and n22. An LD-IC without feedback corresponds to the case in which n11=n22=0 and the capacity region is denoted by C(n11,n22,n12,n21,0,0). In the case in which feedback is available at both transmitters, n11>0 and n22>0, the capacity is denoted by C(n11,n22,n12,n21,n11,n22).This paper presents the exact conditions on n11 (resp. n22) for observing an improvement in the capacity region C(n11,n22,n12,n21,n11,0) (resp. C(n11,n22,n12,n21,0,n22)) with respect to C(n11,n22,n12,n21,0,0), for any 4-tuple (n11, n22, n12, n21)∈N4.Specifically, it is shown that there exists a threshold for the number of bit-pipes in the feedback link of transmitter-receiver pair 1 (resp. 2), denoted by n11⋆ (resp. n22⋆) for which any n11>n11⋆ (resp. n22>n22⋆) enlarges the capacity region, i.e., C(n11,n22,n12,n21,0,0)⊂C(n11,n22,n12,n21,n11,0) (resp. C(n11,n22,n12,n21,0,0)⊂C(n11,n22,n12,n21,0,n22)).The exact conditions on n11 (resp. n22) to observe an improvement on a single rate or the sum-rate capacity, for any 4-tuple (n11,n22,n12,n21)∈N4 are also presented in this paper