Hi All, Hope you are doing well.
Platform Baytrail Issue: Graphics External Display VBIOS/VBT data trying to see the MMIO or VBIOS data when a external display device is plugged/unplugged with DP/HDMI interface, which MMIO register is set or cleared Any inputs are appreciated, some of the registers tried on Port B/Port C are given below. when Display is connected and when Display is not connected, both these instances return the same data. Looking for register/bit that sets/clears when external display is connected/disconnected printk(BIOS_DEBUG, "Intel Gfx BAR GTTMMADR\n"); printk(BIOS_DEBUG, " DP_B %X\n", read32(bar+0x180000+0x64100)); printk(BIOS_DEBUG, " DP_C %X\n", read32(bar+0x180000+0x64200)); printk(BIOS_DEBUG, " HDMIC %X\n", read32(bar+0x180000+0x61160)); printk(BIOS_DEBUG, " HDMIB %X\n", read32(bar+0x180000+0x61140)); printk(BIOS_DEBUG, " Hotplug control %X\n", read32(bar+0x180000+0x61164)); printk(BIOS_DEBUG, " pipeA control %X\n", read32(bar+0x180000+0x61204)); printk(BIOS_DEBUG, " pipeB control %X\n", read32(bar+0x180000+0x61304)); printk(BIOS_DEBUG, " porthot plug stat %X\n", read32(bar+0x180000+0x61114)); *Display SPEC* https://01.org/sites/default/files/documentation/intel_os_gfx_prm_vol10_-_display_0.pdf Thanks Rao
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