[Bug 1880663] Re: Dell Latitude 7300 sometimes stuck at purple screen after grub and fails to boot up

[AceLan Kao]

1. sudo apt update
2. sudo apt upgrade # to revert all what downgraded packages
3. do reboot test(battery mode) (3/10)
   failed at 2nd, 7th, 9th trial (4.15.0-1081-oem)
4. do reboot test, again(ac mode) (4/10)
   failed at 2nd, 4th, 7th, 10th trial (4.15.0-1081-oem)
5. sudo apt install shim=13-0ubuntu2 shim-signed=1.34.9+13-0ubuntu2 # downgrade shim only
6. do reboot test(battery mode (1/10)
   failed at 10th trial
7. do reboot test(ac mode) (6/10)
   failed at 1st, 3rd, 4th, 5th, 8th, 9th trial
8. do reboot test, again(battery mode) (6/20) (because it fails to boot up at 11th and 12th, I do 10 more reboot tests. BTW, it fails to boot up at 21st trial.)
   failed at 10th, 11th, 12th, 15th, 17th, 20th trial
It looks like downgrade shim doesn't help.

9. sudo apt install grub-common=2.02-2ubuntu8 grub-efi-amd64=2.02-2ubuntu8 grub-efi-amd64-bin=2.02-2ubuntu8 grub2-common=2.02-2ubuntu8 grub-efi-amd64-signed=1.93+2.02-2ubuntu8
10. do reboot test(battery mode) (3/10)
   failed at 3rd, 6th, 9th trial
11. do reboot test(ac mode) (2/10)
   failed at 2nd, 8th trial
Downgrade both grub and shim do not work.

12. disable TPM in BIOS(secure boot is off already)
13. do reboot test (4/10)
   failed at 3rd, 7th, 9th, 10th

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Title:
  Dell Latitude 7300 sometimes stuck at purple screen after grub and
  fails to boot up

Status in OEM Priority Project:
  New
Status in grub2 package in Ubuntu:
  New
Status in grub2 source package in Bionic:
  New

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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