Public bug reported: We have brand-new Dell T 5280 workstations (Intel Xeon W-2133 3.6 GHz (3.9 GHz Turbo), 6 Cores) with latest BIOS (1.13.1) and Ubuntu 18.04.3 LTS
$ uname -a Linux hostname 4.15.0-70-generic #79-Ubuntu SMP Tue Nov 12 10:36:11 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux $ lsb_release -rd Description: Ubuntu 18.04.3 LTS Release: 18.04 $ dpkg -l | grep linux-image-4 | grep ^i ii linux-image-4.15.0-66-generic 4.15.0-66.75 amd64 Signed kernel image generic ii linux-image-4.15.0-70-generic 4.15.0-70.79 amd64 Signed kernel image generic $ cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 85 model name : Intel(R) Xeon(R) W-2133 CPU @ 3.60GHz stepping : 4 microcode : 0x200005e cpu MHz : 1200.410 cache size : 8448 KB physical id : 0 siblings : 12 [...] After upgrading the 'intel-microcode' package from 3.20180312.0~ubuntu18.04.1 to 3.20191115.1ubuntu0.18.04.1 the machine hangs upon a warm restart (reboot --> black screen, cursor blinking in the top left corner). Powering off the machine and turning it on again will boot just fine. Removing the intel-microcode package will and rebooting twice will fix the issue. After reinstalling version 3.20180312.0~ubuntu18.04.1 the machine will still be booting correctly. ** Affects: intel-microcode (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1854764 Title: Dell 5280 hangs on warm reboot after upgrading intel-microcode package To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/intel-microcode/+bug/1854764/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs