Howdy
Started using KDE under Fedora a while back, and i have encountered a bit of a problem (i have also posted about this on the fedora forums, here: http://www.forums.fedoraforum.org/showthread.php?t=293891). What happens is that when KDM starts, i get a black screen but i can still log in by typing in the password and pressing return. KDE desktop works without problems though. Since i have two kernels installed, i have tried booting with booth of them. When using 3.9.5 there is no problem (ie, kdm shows and i can login). However, when using the newest kernel (3.10.10) the issue occurs as described. This happens on my asus ux32vd laptop with nvidia discreet chipset disabled and using the intel graphics driver. Any advice on how to proceed with the problem?

Which version of KDE is in use here?
Are you using any form of hybrid graphics integration, such as Bumblebee?

bcooksley wrote:Which version of KDE is in use here?
Are you using any form of hybrid graphics integration, such as Bumblebee?

Aye, i use bumblebee to disable the discreet chip. I'm using 4.10.5. Atm i enabled autologin and set it to lock screen right after. For some reason, kdm works alright when i log out from plasma desktop btw.

Interesting - so this issue only shows up on the initial boot of the system?
If that is the case - do splash screens, etc display themselves properly?

If you by splash screen mean for example the loading screen that shows up directly after login then yes, it shows without problem! For some reason (i only just realized it today btw) it seems when i log in as root, then log out - the log in screen is not shown (i e the same thing that happens on a fresh boot). This all seems quite weird.

The splash screen I was referring to is the on-boot startup screen, which is usually displayed after GRUB, but before the login screen.
One possibility is that your system is trying (and failing) to use Plymouth - which may explain why KDM appears black as it is not correctly switched to.

Does the on-boot splash screen display itself properly, and if it does, does it gracefully fade to the black which should be KDM?

To ensure it's not the boot splash the "interfering process", can you post the output of "cat /proc/cmdline" ?

cat /proc/cmdline

BOOT_IMAGE=/vmlinuz-3.10.11-200.fc19.x86_64 root=UUID=94363d23-509d-455c-944d-cb59683e87e0 ro rootflags=subvol=root rd.md=0 rd.lvm=0 rd.dm=0 rd.luks=0 vconsole.font=latarcyrheb-sun16 vconsole.keymap=sv-latin1 rhgb quiet LANG=en_US.UTF-8 nouveau.modeset=0 rd.driver.blacklist=nouveau

Hmm. I havent added the last two options myself (nouveau stuff) and my /etc/default/grub doesnt contain them either. I am quite unsure of what they are for.

Can you remove "rhgb" and see what happens?

Removing rhgb seems to have solved it. Thanks for the help friends!