Surnrnary. It is u'cll knowrr that lincar SISO systcms t,hat can bc rcrrdcrcri passlve through constant output fccdback can be iiclaptivcly st,altiliscd throul;li a single gain adaptation lau,.. \\'c rcvisit, t,hc dynatnical itchaviotrr of such systems and cxhibit througli a bifurcation analysis a rich varicty of potcnt,ial asymptot,lc dynarnics, for which wc providc a control theorctir: intcrprctation. This in turn lcads us to question the actual adaptivc cont,rol qucstiorr arid solution approach.