Qt's Printer viewport always up 600 pixels when do print

Qt4.8.4
OS: solaris x86 5.10
Printer: FUJI XEROX-3125; FUJI XEROX-3105 and HP P2055dn.
If we run Qt's demo "protedcanvas", just FUJI XEROX-312 can work well. FUJI XEROX-3105 and HP P2055dn can not work.
Becuase the printers' viewport will up 600 pixels when do print.

But all the three printers can work well with other apps, like gedit, pdflaunch.