Question X11 DP/UP board with AST2500 graphic compatible chipset may hang at Linux POST booting somehow. Using debug tool for dumping log via Supermicro online debugtool, it shows PCIe error. With rdbacklist=ast command added in the grub, the problem can be resolved completely and never duplicate such hangup issue. What's the root cause and reason? Answer This problem is caused by inbox driver and impact all version of Redhat/CentOS starting from v7.4 (included). User can have two solutions to patch this hang-up issue. Add grub command for blocking out Aspeed driver during POST. #rdblacklist=ast ast.modeset=0 Updating AST driver to v1.060 or later version. For adding blacklist command in the grub, the user will only be able to access text mode. If the user prefers to keep Desktop, GNOME Desktop environment, please use the new driver for the support. Was this FAQ helpful? YES      NO Enter Comments Below: Note: Your comments/feedback should be limited to this FAQ only. For technical support, please send an email to support@supermicro.com.  Enter your email address below if you'd like technical support staff to reply:  Please type the Captcha (no space) A K D V FAQ Stats FAQ ID Related Category / Keyword Date Posted Code 27624 Operating Systems: - Linux OS Peripherals: - PCI-Expansions (PCI-X, PCI-Express, etc.) - VGA (PCI-e) 03/30/18     Print Answer