** Description changed: + [Impact] + Some buggy BIOSes may fail to properly boot following the chosen boot order, and pass and invalid drive ID to syslinux. + + [Test case] + (requires booting in BIOS mode) + - Attempt to boot an Ubuntu image on a USB drive on an affected system. + - Attempt to boot an Ubuntu image on a USB drive on a system that isn't affected by this issue. + + [Regression potential] + We believe this has a very limited risk of regression. Boot failures may result from changing the code used at early boot for our images, but this should only be adding a hook to force booting on disk 0x80 (first drive) when Ctrl is pressed, and boot normally otherwise. Holding Ctrl while booting is already an accepted "expert" feature to be used in special circumstances. + + Furthermore, this only affects users booting in BIOS mode (no effect on + UEFI). + + -- + I'm reviving this report since the issue is still present in 14.04 and 15.10 syslinux, which is used in the various flavour hybrid ISOs, via mbr/isohdpfx.{S,bin} The same system I originally reported in comment #30 is still affected. Original upstream discussion (March 2009): http://www.syslinux.org/archives/2009-March/012254.html Peter reworked the patches in 2009 and created additional MBRs with the suffix "_c" (press Ctrl to force disk 0x80) and "_f" (unconditionally force disk 0x80). See: http://www.syslinux.org/wiki/index.php/Mbr These images are in the Ubuntu 14.04 package but were removed (in Debian) - and no longer in later Ubuntu releases - with: syslinux (3:6.03~pre19+dfsg-3) unstable; urgency=low * Also skipping isohd*x_{c,f}.bin in syslinux-common. ... -- Daniel Baumann <daniel.baum...@progress-linux.org> Sun, 24 Aug 2014 00:19:38 +0200
** Description changed: [Impact] Some buggy BIOSes may fail to properly boot following the chosen boot order, and pass and invalid drive ID to syslinux. + + Known affected systems are: + - Sony Vaio VGN-FE41Z + - possibly other systems with a Phoenix BIOS. [Test case] (requires booting in BIOS mode) - Attempt to boot an Ubuntu image on a USB drive on an affected system. - Attempt to boot an Ubuntu image on a USB drive on a system that isn't affected by this issue. [Regression potential] We believe this has a very limited risk of regression. Boot failures may result from changing the code used at early boot for our images, but this should only be adding a hook to force booting on disk 0x80 (first drive) when Ctrl is pressed, and boot normally otherwise. Holding Ctrl while booting is already an accepted "expert" feature to be used in special circumstances. Furthermore, this only affects users booting in BIOS mode (no effect on UEFI). -- I'm reviving this report since the issue is still present in 14.04 and 15.10 syslinux, which is used in the various flavour hybrid ISOs, via mbr/isohdpfx.{S,bin} The same system I originally reported in comment #30 is still affected. Original upstream discussion (March 2009): http://www.syslinux.org/archives/2009-March/012254.html Peter reworked the patches in 2009 and created additional MBRs with the suffix "_c" (press Ctrl to force disk 0x80) and "_f" (unconditionally force disk 0x80). See: http://www.syslinux.org/wiki/index.php/Mbr These images are in the Ubuntu 14.04 package but were removed (in Debian) - and no longer in later Ubuntu releases - with: syslinux (3:6.03~pre19+dfsg-3) unstable; urgency=low * Also skipping isohd*x_{c,f}.bin in syslinux-common. ... -- Daniel Baumann <daniel.baum...@progress-linux.org> Sun, 24 Aug 2014 00:19:38 +0200 ** Also affects: syslinux (Ubuntu Yakkety) Importance: Undecided Status: New ** Also affects: syslinux (Ubuntu Xenial) Importance: Undecided Status: New ** Changed in: syslinux (Ubuntu Xenial) Status: New => Triaged ** Changed in: syslinux (Ubuntu Yakkety) Status: New => Triaged ** Changed in: syslinux (Ubuntu Xenial) Importance: Undecided => Medium ** Changed in: syslinux (Ubuntu Xenial) Assignee: (unassigned) => Mathieu Trudel-Lapierre (cyphermox) ** Changed in: syslinux (Ubuntu Yakkety) Importance: Undecided => Medium ** Changed in: syslinux (Ubuntu Yakkety) Assignee: (unassigned) => Mathieu Trudel-Lapierre (cyphermox) ** Changed in: ubuntu-cdimage Assignee: (unassigned) => Mathieu Trudel-Lapierre (cyphermox) ** Changed in: syslinux (Ubuntu) Status: Triaged => In Progress ** Changed in: ubuntu-cdimage Status: New => In Progress -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/277903 Title: Missing Operating System [message at boot] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-cdimage/+bug/277903/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs