https://bugs.freedesktop.org/show_bug.cgi?id=92974
--- Comment #4 from charlie bug0xa3d2@hushmail.com --- With these options there is no ~2 minute kernel boot or startx delay bug:
CONFIG_DRM_AMD_POWERPLAY=y in kernel ".config"
"Device Drivers/Graphics support/Direct Rendering Manager/Enable legacy fbdev support for your modesetting driver" set to, "y" in kernel "make menuconfig".
"amdgpu.powerplay=0" on lilo append line.