-grml vga=normal [video=ofonly] No-framebuffer mode (does not influence X)
-grml vga=ask [video=ofonly] Display menu for framebuffer mode
+grml vga=normal No-framebuffer mode (does not influence X)
+grml vga=ask Display menu for framebuffer mode
+grml radeon.modeset=0 nomodeset Disable Kernel Mode Setting (KMS) for Radeon driver.
+grml i915.modeset=0 nomodeset Disable Kernel Mode Setting (KMS) for Intel driver.
+grml nouveau.modeset=0 nomodeset Disable Kernel Mode Setting (KMS) for Nouveau driver.