I'm not sure if that would be effective, as when display manager has started, X server is in control, not framebuffer/bootsplash.
Probably it's just a matter of changing the KDM background to be widescreen-compatible. I've also got that, the default background is
only made for 4:3 displays, and after displaying it, it is scaled to full screen.
You can easily fix that by changing the default wallpaper. I'll show you how to find out.
default KDM background
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[doktor5000@Mageia3 ~]$ grep background /var/lib/mageia/kde4-profiles/Default/share/config/kdm/backgroundrc
Wallpaper=/usr/share/mga/backgrounds/default.jpg
taken from above, the default is only a symlink, let's look what it points at:
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[doktor5000@Mageia3 ~]$ ls -al /usr/share/mga/backgrounds/default.jpg
lrwxrwxrwx 1 root root 28 Mai 19 13:36 /usr/share/mga/backgrounds/default.jpg -> Mageia-Default-1920x1440.jpg
1920 / 1440 = 1,33 which is a ratio of 4:3.
I'm running a display of 1366 x 768, which is a 16:9 ratio: 1366 / 768 = 1,77
So let's look which backgrounds are available with a 16:9 ratio:
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[doktor5000@Mageia3 ~]$ ls -al /usr/share/mga/backgrounds/
insgesamt 16820
drwxr-xr-x 2 root root 4096 Mai 19 13:36 ./
drwxr-xr-x 10 root root 4096 Mai 18 15:06 ../
lrwxrwxrwx 1 root root 28 Mai 19 13:36 default.jpg -> Mageia-Default-1920x1440.jpg
-rw-r--r-- 1 root root 255965 Apr 17 14:06 Mageia-Default-1024x600.jpg
-rw-r--r-- 1 root root 838928 Apr 17 14:06 Mageia-Default-1024x600.png
-rw-r--r-- 1 root root 570876 Apr 17 14:06 Mageia-Default-1280x1024.jpg
-rw-r--r-- 1 root root 1875491 Apr 17 14:06 Mageia-Default-1280x1024.png
-rw-r--r-- 1 root root 921242 Apr 17 14:06 Mageia-Default-1920x1080.jpg
-rw-r--r-- 1 root root 2924820 Apr 17 14:06 Mageia-Default-1920x1080.png
-rw-r--r-- 1 root root 1026231 Apr 17 14:06 Mageia-Default-1920x1200.jpg
-rw-r--r-- 1 root root 3250724 Apr 17 14:06 Mageia-Default-1920x1200.png
-rw-r--r-- 1 root root 1176204 Apr 17 14:06 Mageia-Default-1920x1440.jpg
-rw-r--r-- 1 root root 3719668 Apr 17 14:06 Mageia-Default-1920x1440.png
-rw-r--r-- 1 root root 139895 Apr 17 14:06 Mageia-Default-800x480.jpg
-rw-r--r-- 1 root root 488336 Apr 17 14:06 Mageia-Default-800x480.png
As we don't want artifacts, choose one larger then your display resolution and change the symlink to it.
I've chose the 1920 x 1080 one, as that's also a 16:9 ratio: 1920 / 1080 = 1,77
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[doktor5000@Mageia3 ]$ cd /usr/share/mga/backgrounds
[doktor5000@Mageia3 backgrounds]$ sudo ln -sf Mageia-Default-1920x1080.jpg default.jpg
Logout, login and it should be normal.