[Q] Problem with ICS (flicker display.)

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http://forum.xda-developers.com – Hello I'm new here. I have a Problem with my Galaxy Tablet 8.9 Wifi Only with Ice Cream Sandwich 4.0.4. I've found a Tutorial here on xda (http://forum.xda-developers.com/show....php?t=1582943). Than i've flashed my Tablet. During flashing no problems. After flashing the ics FW, I started my tablet. I thougt, "fine it works! very smooth. cool!". But if i lock my tablet and than unlock the display shows only black and white pixels like an old tv. I've restarted the tablet and it works normally, but even if i lock my tablet and unlock it again, the same problem appear (HowTos)