The only thing I can think of is that the official fedora xorg intel driver package is carrying a patch that upstream doesn't have.
Was there anything informative in dmesg's output or in the Xorg log?
Fedora 23 Lenovo T450 Docking Station/Monitors detection
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01 Staff (not verified)
01 Staff (not verified)
Mar 21, 2016 - 05:53am
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fledermaus (not verified) Mar 21, 2016 - 01:11pm
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skontar (not verified) Apr 18, 2016 - 06:25am
I had the same problem with Lenovo T440. The drivers in Fedora 23 repo are older. Now, when I know where is the problem, I can reinstall the new drivers, run whatever diagnostics would be useful, and remove it again. I have never done that, so running `dmesg` and listing `/var/log/Xorg.0.log` would do?
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fledermaus (not verified) Apr 18, 2016 - 09:12am
It's usually a good place to start since it lets us see what the kernel logged and what heppened while X was starting up. What happened here (we've recently discovered) is that the Fedora packages were built from a developement branch of the xorg driver which had not been released, so although they had the same version (plus a datestamp) they were actually significantly different to what we'd put into the 01.org repo (which was the released version).
We should be pushing a package soon which fixes that, and now we know to watch out for this in upcoming releases so it shouldn't happen again.
Hi there,
Updated my Fedora 23 setup (Lenovo T450, ThinkPad Ultra Dock, Eizo EV2216W) this morning with Intel Graphics Installer for Linux* 1.4.0
I've experienced login screen corruption/glitch, second monitor connected through a docking station was no more detected after login (xrandr). Uninstalled through dnf > history, things went back to normal.
Any idea?