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Description of problem: When I connect my external monitor (Dell U2713HM) to my laptop using a Dock (Ultra Dock, 90W) I'm not able to use the monitor's native resolution which is 2560x1440. I'm able to lower the resolution to 1920x1080 and it starts to work. Native resolution is detected and I'm able to select it from the Gnome Displays control setting. I'm even able to arrange screens how I want. The only problem is that its black :) I found that downgrading the kernel to kernel-4.4.6-301.fc23.x86_64 from Fedora 23 make it work again. It fails for me on kernel-4.5.1-300.fc24.x86_64. Please let me know what kind of information I can provide so it'll be useful to fix this issue. xrandr output: xrandr Screen 0: minimum 8 x 8, current 4480 x 1440, maximum 32767 x 32767 eDP1 connected 1920x1080+2560+360 (normal left inverted right x axis y axis) 309mm x 173mm 1920x1080 60.05*+ 1400x1050 59.98 1600x900 60.00 1280x1024 60.02 1280x960 60.00 1368x768 60.00 1280x720 60.00 1024x768 60.00 1024x576 60.00 960x540 60.00 800x600 60.32 56.25 864x486 60.00 640x480 59.94 720x405 60.00 640x360 60.00 DP1 disconnected (normal left inverted right x axis y axis) DP2 disconnected (normal left inverted right x axis y axis) DP2-1 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 597mm x 336mm 2560x1440 59.95*+ 1920x1200 59.88 1920x1080 60.00 60.00 50.00 59.94 24.00 23.98 1600x1200 60.00 1680x1050 59.95 1280x1024 75.02 60.02 1280x800 59.81 1152x864 75.00 1280x720 60.00 50.00 59.94 1024x768 75.08 60.00 800x600 75.00 60.32 720x576 50.00 720x480 60.00 59.94 640x480 75.00 60.00 59.94 720x400 70.08 DP2-2 disconnected (normal left inverted right x axis y axis) DP2-3 disconnected (normal left inverted right x axis y axis) HDMI1 disconnected (normal left inverted right x axis y axis) HDMI2 disconnected (normal left inverted right x axis y axis) VIRTUAL1 disconnected (normal left inverted right x axis y axis) Version-Release number of selected component (if applicable): How reproducible: Always Steps to Reproduce: 1. Boot the laptop 2. Select wqhd resolution. Actual results: External monitor is black and after time it switches to power save mode. Expected results: Screen working. Additional info: See on kernel-4.5.1-300.fc24.x86_64.
I forgot to add that I tested this on X11 and on Wayland as well - no difference.
It doesn't work with newest kernel either: kernel-4.5.2-301.fc24.x86_64.
What graphics device is this use?
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 5500 (rev 09) (prog-if 00 [VGA controller]) Subsystem: Lenovo Device 5036 Flags: bus master, fast devsel, latency 0, IRQ 46 Memory at e0000000 (64-bit, non-prefetchable) [size=16M] Memory at d0000000 (64-bit, prefetchable) [size=256M] I/O ports at 3000 [size=64] Expansion ROM at <unassigned> [disabled] Capabilities: <access denied> Kernel driver in use: i915 Kernel modules: i915
More info: 1. Happens with kernel-4.5.3-300.fc24.x86_64 too. 2. The Wayland-based login screen displays correctly, in proper resolution, after I log in, the external monitor goes black. 3. When I boot my laptop without docking station and wait a couple of minutes, let's say 5 min, and then I dock it - external monitor displays the content correctly, in correct resolution. The issue seems to be happening when I boot my laptop connected to docking station and I log in.
It looks that running kernel 4.5.7-300.fc24.x86_64 fixed the issue for me, closing.