I just bought a XB253Q GX and the new monitor will not work before booting into Windows. After switching to HDMI, I was using DP, I went into the bios and enabled CSM and the monitor now works with DP before Windows boots. Is there anyway other than this solution to get the monitor to work before booting into Windows? The new CSM setting is causing other issues. I had an Asus monitor prior to this one and never had this issue. I also have another Asus monitor on my other computer and never had this issue. What gives? Is this a "feature" of Acer monitors?