I just tested with a fresh install of 19.04 (booted up with nomodeset and installed). After installation I confirmed I was running 5.0.0-11.12, but the laptop panel link training issue is still present (Dell XPS 9575) causing a black screen on boot. The only way to boot is with nomodeset as a kernel boot parameter.
Note: as a side issue it was virtually impossible to bring up the grub menu now in 19.04 (I think because the timeout is set to zero). I had to make sure to chroot into the newly installed system (after installing) and then edit the /boot/grub/grub.cfg file and manually edit the timeout value. I thought that the this Ubuntu bug was referring to this bug (REGRESSION: black screen with linux 5.0 when starting X) https://bugs.freedesktop.org/show_bug.cgi?id=109959), but perhaps it's referencing another issue entirely? Not sure, but either way the failed link training bug still appears to be present with 5.0.0-11.12 causing black screens on bootups with certain laptop panels. Reading through that thread on bugs.freedesktop.org, Intel realized the problem was caused by certain laptop panels not reporting their specifications correctly (Dell XPS systems appear affected, but other laptops will most likely also be affected), so the code they added to optimize the link (fast and narrow vs. slow and wide) would cause certain laptop panels to never display anything with modesetting. Towards the end of the thread to posted a 5.0 backport patch which completely removes the link optimizations, https://patchwork.freedesktop.org/patch/296411/. Based on the Ubuntu kernel changelog I'm not sure exactly what patch was reverted. My guess is it's for another issue entirely. I'll probably try to compile the Ubuntu kernel with their the freedesktop.org backport patch applied and report back. I can also post my dmeg here for reference. ** Bug watch added: freedesktop.org Bugzilla #109959 https://bugs.freedesktop.org/show_bug.cgi?id=109959 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1821820 Title: Cannot boot or install - have to use nomodeset To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1821820/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
