So I think I can now at least explain the weirdness. Booting from the ISO as well as the first boot in OEM mode seem to be in a way where grub does not use graphics mode and hands that off to a vt. In that case, when the kernels starts there will be no VESA framebuffer which later gets switched over to qxl framebuffer.
So what I think broke is the init of the framebuffer drawing context. Which potentially is not needed when it is switched over from VESA to qxl. As soon as there was one successful boot in OEM mode, it looks like graphics handoff is used. So after that both 4.12 and 4.14 (and likely 4.13 as well) will successfully boot as well. One way I was able to make this work immediately was to interrupt the boot and replace $vt_handoff by vt.handoff=7 (or =1). And then boot on with that setting. In the crashed boots this was not set at all. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1711358 Title: 20170817 - ISO hangs on boot on qemu with splash screen enabled and qxl graphics driver Status in linux package in Ubuntu: Confirmed Status in plymouth package in Ubuntu: Confirmed Status in ubiquity package in Ubuntu: Confirmed Bug description: Test Case 1. Boot artful desktop 20170817 under qemu with qxl 2. Wait until ubiquity-dm is displayed Expected result It boots Actual result It hangs on the splash screen and the dots below the Ubuntu logo are not blinking. If the option 'splash' is removed from the boot command line it boots successfully. It also boots successfully with -vga std but in this case the splash screen is in text mode not graphical unlike with the qxl driver. - It started with kernel 4.12. - It is still happening with kernel 4.13. - It only happens when booting from an ISO and not on an installed system. - It works with cirrus/vga, but not qxl - It works if nosplash is set (or splash removed from the boot command line) - It works on Xenial but not on Artful To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1711358/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
