Description of problem: When connecting 2 screens to the dock of my laptop, one of them not detected (neither in VGA or in display port) - graphic card is a ATI / Intel hybrid card (the integrated screen of the laptop is not used) Version-Release number of selected component (if applicable): [mlombard@mallorne]~% lspci | grep VGA 00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated Graphics Controller (rev 0b) 03:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Mars [Radeon HD 8730M] xorg-x11-drv-ati-7.2.0-3.20131101git3b38701.fc20.x86_64 xorg-x11-drv-intel-2.21.15-7.fc20.x86_64 xorg-x11-server-Xorg-1.14.4-11.fc20.x86_64 How reproducible: Connect two screens Actual results: only one screen working Expected results: 2 screens working Additional info: xrandr output : [mlombard@mallorne]~% xrandr Screen 0: minimum 320 x 200, current 2560 x 1440, maximum 16384 x 16384 DisplayPort-0 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 597mm x 336mm 2560x1440 59.95*+ 3840x1200 60.00 2560x1024 60.00 1920x1200 59.88 1600x1200 60.00 1680x1050 59.95 1280x1024 75.02 60.02 1280x800 59.81 1152x864 75.00 1024x768 75.08 60.00 800x600 75.00 60.32 640x480 75.00 60.00 59.94 720x400 70.08 DisplayPort-1 disconnected (normal left inverted right x axis y axis) eDP1 connected (normal left inverted right x axis y axis) 1600x900 60.01 + 40.01 1024x768 60.00 800x600 60.32 56.25 640x480 59.94 DP3 disconnected (normal left inverted right x axis y axis) HDMI1 disconnected (normal left inverted right x axis y axis) DP4 disconnected (normal left inverted right x axis y axis) HDMI2 disconnected (normal left inverted right x axis y axis) 1024x768 (0x4a) 65.000MHz h: width 1024 start 1048 end 1184 total 1344 skew 0 clock 48.36KHz v: height 768 start 771 end 777 total 806 clock 60.00Hz 800x600 (0x4b) 40.000MHz h: width 800 start 840 end 968 total 1056 skew 0 clock 37.88KHz v: height 600 start 601 end 605 total 628 clock 60.32Hz 640x480 (0x4d) 25.175MHz h: width 640 start 656 end 752 total 800 skew 0 clock 31.47KHz v: height 480 start 490 end 492 total 525 clock 59.94Hz
After research, problem seems linked to Display Port Multi-Stream Transport. It's not supported yet by the open-source driver
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