| medium DP re-read status if updated bit isn't set | |
| medium DP honor adjust requests also if training succeeded? | |
| unknown DP honor SINK_STATUS after training | |
| low LVDS 8bit colors, data format??? | |
| medium SKL check if DPLL_CTRL2 really defaults to `Clock Off` => 0 | |
| medium gfxtest take care of our own framebuffer mapping |