Hi, > I noted Thomas (scdbackup) asked for firmware details
The motivation is to find enough affected hardware so that the delay can be reproduced by developers. Obviously it did not happen with the regular testing machines. So my request/proposal was for the general public: Tell which machines are slow at booting the current Ubuntu ISOs. --------------------------------------------------------------------------- If it becomes reproducible for a developer who understands the boot sequence well enough to identify the actual step which needs too long, then a chance for a fix or a workaround could emerge. My suspicion is that some part of GRUB gets different info from the firmware, depending on whether the second MBR partition exists or not. The info in the case of an existing second partition then would cause this or another part of GRUB to wait for something that won't happen in reasonable time. I confess that this is a wide and vague theory. But the insight we have does not yield more than that. So we need to bring together a machine with that problem and a developer with sufficient interest and GRUB knowledge to find out what's happening and to start discussing the problem with grub-devel mailing list. I assume that the GRUB developers will not be interested yet, because the problem is a reaction of a mild violation of GPT specs by Ubuntu's ISO with its second MBR partition of type 0x00 and boot flag. --------------------------------------------------------------------------- Another path for a sustainable solution would be if we find enough affected machines to convince Ubuntu to offer two flavors of ISOs. One "for picky EFI" with GPT and a fully specs compliant Protective MBR. (Won't work for old HP laptops.) One "for picky BIOS" without GPT but rather an MBR partition table. (Won't work on newer Lenovos.) We had both versions already when the new Ubuntu ISO layout was developed. Both could still serve the majority of BIOS and EFI systems. Their success would differ only on the mentioned machines which show a peculiar interpretation of EFI specs and BIOS tradition. "For picky BIOS" was the ISO layout at the beginning of https://bugs.launchpad.net/ubuntu-cdimage/+bug/1886148 and "for picky EFI" was the layout at its end. The attempt to have a single ISO for all yielded the current layout, which was the result of https://bugs.launchpad.net/ubuntu-cdimage/+bug/1899308 Have a nice day :) Thomas -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1922342 Title: HIrsute live session takes ages to boot on BIOS systems To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/casper/+bug/1922342/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
