Eu encontro resposta eu mesmo:
(1) Modifique o arquivo ~ / .vnc / config:
## Supported server options to pass to vncserver upon invocation can be listed
## in this file. See the following manpages for more: vncserver(1) Xvnc(1).
## Several common ones are shown below. Uncomment and modify to your liking.
##
# securitytypes=vncauth,tlsvnc
# desktop=sandbox
geometry=2560x1440
# localhost
# alwaysshared
(2) Reinicie o servidor VNC, então eu posso selecionar 2560X1440
resolution:
BTW, devo usar x , não * em 2560X1440
.