Created attachment 433550 [details] kernel .config file I have AMD system: Phenom II 955 x4 with 4x2Gig of DDR3 HD6850 (=Barts) card with 3 monitors on it ( old elcheapo Samsungs Synmaster BM204 that do 1600x1200 at 20") On this I usually run latest gentoo-sources that are set up with open source radeon driver built in. Up to latest gentoo-sources-4.4*, this worked fine. With 4.5.0, all monitors would blank moment after kernel is loaded in GRUB adn stay blank during whole boot, which ends at text console login ( I normally do manual "systemctl isolate graphical target" to get into LightDM/XFCE). After that, i can blindly type my username & pass to login and after "systemctl isolate graphical.target" everything wakes up and I get LightDM screen just fine. greping through kernel log ring with dmesg and journalctl -b -t kernel doesn't list anything suspicious. It is as if kernel forgets to flip one last bit to turn picture generation on after setting the card... XFCE works just fine, but I can't switch VT to VT-1..6 after that with CTRL-ALT-<1..6>. When I try that, everything on screen freezes and stays that way until I switch back with CTRL-ALT-7. Since I have compiled-in radeon support as described in: https://wiki.gentoo.org/wiki/Radeon I had doublechecked that I do include right firmware blobs in the kernel. Everything seems fine there. Has anyone experienced anything like that ?
CONFIG_DRM_FBDEV_EMULATION: Choose this option if you have a need for the legacy fbdev support. Note that this support also provides the linux console support on top of your modesetting driver. If in doubt, say "Y".
Aaaargh ! I'm such an idiot! Thanks. Your kung fu is strong- well, stronger than mine anyway ;o) Thanks.
