Hello, The connector list is wrong on my system (amd A8-3850 with integrated radeon hd 6550d). My system have got VGA, DVI and HDMI connectors. The VGA connector is always reported as connected by xrandr (connected or not). I deactivated this one with kernel parameters video=HDMI-A-1:e video=VGA-1:d. The DVI connector appears as HDMI-0. The HDMI connector is absent (When I connect a monitor to this one, HDMI-0 becomes this output and the DVI output is lost). Anthony. $ dmesg [ 3.100950] [drm] Radeon Display Connectors [ 3.100951] [drm] Connector 0: [ 3.100953] [drm] VGA [ 3.100954] [drm] HPD2 [ 3.100955] [drm] DDC: 0x6440 0x6440 0x6444 0x6444 0x6448 0x6448 0x644c 0x644c [ 3.100956] [drm] Encoders: [ 3.100958] [drm] CRT1: INTERNAL_UNIPHY2 [ 3.100959] [drm] CRT1: NUTMEG [ 3.100960] [drm] Connector 1: [ 3.100961] [drm] HDMI-A [ 3.100962] [drm] HPD1 [ 3.100963] [drm] DDC: 0x6430 0x6430 0x6434 0x6434 0x6438 0x6438 0x643c 0x643c $ lspci -v 00:01.0 VGA compatible controller: ATI Technologies Inc Device 9640 (prog-if 00 [VGA controller]) Subsystem: ASUSTeK Computer Inc. Device 84c8 Flags: bus master, fast devsel, latency 0, IRQ 52 Memory at d0000000 (32-bit, prefetchable) [size=256M] I/O ports at f000 [size=256] Memory at feb00000 (32-bit, non-prefetchable) [size=256K] Expansion ROM at <unassigned> [disabled] Capabilities: [50] Power Management version 3 Capabilities: [58] Express Root Complex Integrated Endpoint, MSI 00 Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+ Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?> Kernel driver in use: radeon $ xrandr Screen 0: minimum 320 x 200, current 1680 x 1050, maximum 8192 x 8192 VGA-0 disconnected (normal left inverted right x axis y axis) HDMI-0 connected 1680x1050+0+0 (normal left inverted right x axis y axis) 474mm x 296mm 1680x1050 60.3*+ 1280x1024 75.0 60.0 1440x900 75.0 59.9 1280x960 60.0 1152x864 75.0 1280x720 60.0 1024x768 75.1 60.0 800x600 75.0 60.3 640x480 75.0 60.0 720x400 70.1
You can only use DVI or HDMI, but not both at the same time. The bios will enumerate whatever connectors are connected at boot time. You cannot switch them on the fly. The phantom VGA detection should be fixed in kernel 3.1 with fixes showing up in the stable series kernels as well.
You can only have two connectors in use at the same time. The ones that you can use must be connected at boot time. If you want to use DVI and HDMI, you have to connect both of them at boot time and the oem has to have wired up the board to allow it. Check your owners manual to see what combinations are supported simultaneously.
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