Hi Nanda,
Thank you for this. I did now use pre-login instead of post-login like you suggestet above. After i also changed the standard prompt to '#', the login actually worked.
However, now i have messages like "Waiting for an echo of screen-lenth disable command" or "Waiting for an echo of system-view command" and also failure to entering enable mode. (Now set command for enabled mode to "configure" and now have to figure out what expected prompt would be like.
I assume the current command set for HP.Switches.Others does not match too well with 2920 model.