scaling issue after wake from sleep

Asus Zenbook ux301LA, i5 Haswell, Intel graphics HD4400, Win 8.1 x64, 2560x1440 display. It came with Win 8, I updated to 8.1 After wake from sleep the scaling is way off, everything is tiny... So I can't use sleep, must do a full shutdown and restart to get back to normal resolution. Asus does not list any graphics drivers for 8.1, only 8. So I got a generic Intel HD graphics driver...