Then i have another idea for You mate.
Go to /var/log/ you will find a Xorg.99.log file in there. Open it and search for a string Modeline, you should find modelines taken from Your laptop's monitor edid. Choose the one appropriate for Your resolution. Next go to YaST, then sysconfig, choose Desktop-->>Display Manager-->>then choose DISPLAYMANAGER_RANDR_MODE_AUTO ( you can see there is some 1024x768 resolution) now change that with the modeline found in Xorg.99.log for your desired resolution. Watch for capital letter as modelines in Xorg.99.log don't have them so adjust it and paste in there, hope it will help You. Please report back if it will help You. Don't copy the part with kHz
