Description of problem:
If i connect a second display to my notebooks (t430) mDP (only connected to dGPU) most times i got a broken desktop. both laptop and external display are recognized, but the internal only show a grey screen. the courser couldn't be moved to the internal screen but a small part of the courser is visible if move to the shared edge. the internal should be the prim display as no gnome bar is viable.
if i cycle through mode wit super+p i noticed that there are 5 states instead of 4. each screen individually, mirrored, extended and broken extended which is often the default if i connect a display.
Version-Release number of selected component (if applicable):
Connect a second display to the mDP on a lenovo T430 and cycle through thedisplay modes.
Steps to Reproduce:
broken display arragnment. see above.
just normale extension of the desktop on the external screen
done on fedora test day
tests done as enno on
As i noticed with further experiments this only happens on my dell 24" on all ports DP,DVI and VGA but not on the LG with DVI and VGA.
I've done a kernel scratch-build with some patches which might help here. Can you give this a try please? From here: https://koji.fedoraproject.org/koji/taskinfo?taskID=16384253 download both the kernel-core and kernel-modules x86_64 rpms and put them together in a directory, then from that directory run:
sudo rpm -ivh kernel*.rpm
Note "-ivh" rather then the standard "-Uvh" so that you keep your current kernel and can always select it in the bootloader in case 4.8.6 fails to boot for you for some reason.
Then reboot and see how things go.
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