After restore OS to factory state and directly update intel-microcode by "apt install intel-microcode", then will meet this issue.
this should be the intel-microcode issue. the info of intel-microcode, before update, [ 1.131499] microcode: sig=0x806eb, pf=0x80, revision=0xc6 [ 1.132064] microcode: Microcode Update Driver: v2.2. after update [ 0.000000] microcode: microcode updated early to revision 0xd6, date = 2020-04-27 [ 1.156375] microcode: sig=0x806eb, pf=0x80, revision=0xd6 [ 1.156916] microcode: Microcode Update Driver: v2.2. lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 8 On-line CPU(s) list: 0-7 Thread(s) per core: 2 Core(s) per socket: 4 Socket(s): 1 NUMA node(s): 1 Vendor ID: GenuineIntel CPU family: 6 Model: 142 Model name: Intel(R) Core(TM) i5-8265U CPU @ 1.60GHz Stepping: 11 CPU MHz: 989.418 CPU max MHz: 3900.0000 CPU min MHz: 400.0000 BogoMIPS: 3600.00 Virtualization: VT-x L1d cache: 32K L1i cache: 32K L2 cache: 256K L3 cache: 6144K NUMA node0 CPU(s): 0-7 Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf tsc_known_freq pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb invpcid_single ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid mpx rdseed adx smap clflushopt intel_pt xsaveopt xsavec xgetbv1 xsaves dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp flush_l1d arch_capabilities -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1880663 Title: Dell Latitude 7300 sometimes stuck at purple screen after grub and fails to boot up To manage notifications about this bug go to: https://bugs.launchpad.net/oem-priority/+bug/1880663/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
