** Description changed: I observed a very strange behaviour and have not found a solution so far: Legacy BIOS GRUB2 (2.02-2ubuntu8.13) Nvidia Quadro K420 ASUS PB27U 4k monitor connected via display port The monitor allows to select DP1.1 (30Hz@4k) and DP1.2 (60Hz@4k) via OSD. With DP1.1 computer boots up normally but it would be required to later change manually to 60Hz. With DP1.2 the BIOS messages (POST) are seen, then a short cursor blink in the left upper corner and the systems halts with a blank screen (I can exclude that grub continues with the boot up process since I cannot ping the machine). I tried: GRUB_GFXMODE "1024*768*8" and GRUB_TERMINAl "console" reinstalling MBR + Always the same picture: DP1.1 no problem, DP1.2 no GRUB. - Always the same picture: DP1.1 no problem, DP1.2 no GRUB. + + One more oddity: If a boot in DP1.1 and then switch the monitor to DP1.2 during GRUB the boot process continues normally and I end with a graphic session 60Hz@4k as intended. + + It appears that only the inital grub2 loading is affected somehow.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1853735 Title: grub2 fails to load with DP1.2 (but not DP1.1) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1853735/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
