If you want to build your own kernel, you can get the source from https://launchpad.net/ubuntu/+source/linux/4.4.0-47.68
Have a look at the file drivers/gpu/drm/radeon/si_dpm.c Use the following commit as an example https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=ea039f927524e36c15b5905b4c9469d788591932 Note the line _above_ the line in green. That is your graphics card. Try changing it from { PCI_VENDOR_ID_ATI, 0x6811, 0x174b, 0xe271, 0, 120000 } to { PCI_VENDOR_ID_ATI, 0x6811, 0x174b, 0xe271, 85000, 90000 } and also try removing that line altogether. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1570653 Title: LG 31MU97-B Black 31" 4K Monitor not detected properly To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1570653/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
