[Bug 1880663] Re: Dell Latitude 7300/7400, i7-8665U, sig=0x806eb/20200609, sometimes stuck at purple screen after grub and fails to boot up

[You-Sheng Yang]

I have a Inspiron-7380 with i5-8265U with the same cpu signature.
Microcode 0x806eb revision 0xca doesn't hang system at boot.

$ 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:             900.340
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 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 md_clear flush_l1d arch_capabilities

$ dmesg | grep microcode
Inspiron-7380 kernel: microcode: microcode updated early to revision 0xca, date = 2019-10-03
Inspiron-7380 kernel: microcode: sig=0x806eb, pf=0x80, revision=0xca

** Summary changed:

- Dell Latitude 7300/7400, i7-8665U, sig=0x806eb/20200609, sometimes stuck at purple screen after grub and fails to boot up
+ Dell Latitude 7300/7400, i7-8665U/i5-8265U, sig=0x806eb/20200609, sometimes stuck at purple screen after grub and fails to boot up

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https://bugs.launchpad.net/bugs/1880663

Title:
  Dell Latitude 7300/7400, i7-8665U/i5-8265U, sig=0x806eb/20200609,
  sometimes stuck at purple screen after grub and fails to boot up

Status in OEM Priority Project:
  New
Status in intel-microcode package in Ubuntu:
  Confirmed
Status in intel-microcode source package in Bionic:
  Confirmed
Status in intel-microcode source package in Focal:
  Confirmed

Bug description:
  With linux-4.15.0-1081 kernel, it usually stuck at purple screen after grub.
  There is no any log in journal when it fails to boot up, and earlyprintk shows nothing on the screen, either.

  System Information
          Manufacturer: Dell Inc.
          Product Name: Latitude 7300
          Version: Not Specified
          Serial Number: J83ZST2
          UUID: 4C4C4544-0038-3310-805A-CAC04F535432
          Wake-up Type: Power Switch
          SKU Number: 08E0
          Family: Latitude

  BIOS Information
          Vendor: Dell Inc.
          Version: 1.6.1
          Release Date: 11/14/2019
          Address: 0xF0000
          Runtime Size: 64 kB
          ROM Size: 24 MB
          Characteristics:
                  PCI is supported
                  PNP is supported
                  BIOS is upgradeable
                  BIOS shadowing is allowed
                  Boot from CD is supported
                  Selectable boot is supported
                  EDD is supported
                  Japanese floppy for NEC 9800 1.2 MB is supported (int 13h)
                  5.25"/1.2 MB floppy services are supported (int 13h)
                  3.5"/720 kB floppy services are supported (int 13h)
                  3.5"/2.88 MB floppy services are supported (int 13h)
                  Print screen service is supported (int 5h)
                  8042 keyboard services are supported (int 9h)
                  Serial services are supported (int 14h)
                  Printer services are supported (int 17h)
                  ACPI is supported
                  USB legacy is supported
                  Smart battery is supported
                  BIOS boot specification is supported
                  Function key-initiated network boot is supported
                  Targeted content distribution is supported
                  UEFI is supported
          BIOS Revision: 1.6

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