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Bug#832476: addition

Addition: "Automatic" was probably broken by the intel driver before too. I just found an entry I made in /etc/X11/Xsessions.d which set "RGB Broadcast" to full, which now didn't worked anymore because the device/port is now DP-1 instead of DP1.
Nevertheless, somewhere is a bug, either in RGB-range detection or my monitor is reporting a wrong range. 

edid-decode output below:

header:          00 ff ff ff ff ff ff 00
serial number:   15 c3 68 20 01 01 01 01 14 15
version:         01 04
basic params:    a5 33 1d 78 e2
chroma info:     ee 95 a3 54 4c 99 26 0f 50 54
established:     a1 08 00
standard:        81 80 81 40 b3 00 81 c0 01 01 01 01 01 01 01 01
descriptor 1:    02 3a 80 18 71 38 2d 40 58 2c 45 00 fe 1f 11 00 00 1e
descriptor 2:    00 00 00 ff 00 37 34 36 39 37 30 35 31 0a 20 20 20 20
descriptor 3:    00 00 00 fd 00 3b 3d 1f 44 0f 00 0a 20 20 20 20 20 20
descriptor 4:    00 00 00 fc 00 45 56 32 33 33 33 57 0a 20 20 20 20 20
extensions:      01
checksum:        42

Manufacturer: ENC Model 2068 Serial Number 16843009
Made week 20 of 2011
EDID version: 1.4
Digital display
8 bits per primary color channel
DisplayPort interface
Maximum image size: 51 cm x 29 cm
Gamma: 2.20
DPMS levels: Standby Suspend Off
Supported color formats: RGB 4:4:4
First detailed timing is preferred timing
Established timings supported:
  720x400@70Hz
  640x480@60Hz
  800x600@60Hz
  1024x768@60Hz
Standard timings supported:
  1280x1024@60Hz
  1280x960@60Hz
  1680x1050@60Hz
  1280x720@60Hz
Detailed mode: Clock 148.500 MHz, 510 mm x 287 mm
               1920 2008 2052 2200 hborder 0
               1080 1084 1089 1125 vborder 0
               +hsync +vsync
Serial number: 74697051
Monitor ranges (GTF): 59-61Hz V, 31-68kHz H, max dotclock 150MHz
Monitor name: EV2333W
Has 1 extension blocks
Checksum: 0x42 (valid)

CEA extension block
Extension version: 3
20 bytes of CEA data
  Video data block
    VIC 01 640x480@60Hz
    VIC 02 720x480@60Hz
    VIC 03 720x480@60Hz
    VIC 04 1280x720@60Hz
  Audio data block
    Linear PCM, max channels 1
    Supported sample rates (kHz): 192 176.4 96 88.2 48 44.1 32
    Supported sample sizes (bits): 24 20 16
  Speaker allocation data block
  Vendor-specific data block, OUI 000c03 (HDMI)
    Source physical address 1.0.0.0
    Supports_AI
Underscans PC formats by default
Basic audio support
0 native detailed modes
Detailed mode: Clock 25.170 MHz, 510 mm x 287 mm
                640  656  752  800 hborder 0
                480  490  492  525 vborder 0
               -hsync -vsync
Detailed mode: Clock 27.000 MHz, 510 mm x 287 mm
                720  736  798  858 hborder 0
                480  489  495  525 vborder 0
               -hsync -vsync
Detailed mode: Clock 27.000 MHz, 510 mm x 287 mm
                720  736  798  858 hborder 0
                480  489  495  525 vborder 0
               -hsync -vsync
Detailed mode: Clock 74.250 MHz, 510 mm x 287 mm
               1280 1390 1430 1650 hborder 0
                720  725  730  750 vborder 0
               +hsync +vsync
Checksum: 0x33 (valid)
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