Okey, I 've had exactly the same problem with OpenMandriva( Beta worked, RC didn't work), so I filled bug on their bugzilla and this is conclusion.
OpenMandriva developer said I should try to run some commands resp. add some commands in to boot. Here is what happened. alt+ctrl+f1= nothing i915.invert_brightness=1 = Nothing xorg.blacklist= intel = nothing xorg.blacklist= ati = works xorg.blacklist= intel +nomodeset = works xorg.blacklist= ati+nomodeset = works nomodeset itself without additional commands=works Here is his reaction: "It's not to much of a mystery now. It is to do with the plymouth bootsplash and kernel graphics mode setting. Basically what is happening is that plymouth is initialising graphics on the intel chip and then xorg is auto-detecting the ati adapter and switching to that. Because the the drm kernel modules are already loaded for the Intel hardware the ati driver cannot unload them and thus the ati hardware does not get it's kernel module drivers loaded which basically comes down to the fact that you get a black screen. It worked in the beta because we were loading the uvesa frame buffer driver but that caused problems with other cards. Currently automated graphics detection is a bit of a minefield to say the least!! For the moment it probably best that you add one of the working configs that you have tested to the default boot line as I described." I've thought it would be helpful -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1264835 Title: Low graphic mode To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1264835/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
