(debian) kernel 6.8.8-surface-1 + grub enters in boot loop

[nouknouk]

Hi,

I'm a user of surface-linux on my surface pro 9.

The latest version, linux-[headers|image]-6.8.8-surface-1 doesn't boot, whereas the previous version linux-[headers|image]-6.8.6-surface-1 runs well.

After showing up the grub welcome screen, when I choose kernel 6.8.8, the system show a black screen for 1-2 seconds, then reboots, showing briefly the (black & white) windows logo, then grub again.

Notes:

• kernel 6.8.6 startup is ok.
• windows startup is ok
• secure boot enabled ; key enrolled a while ago, following the wiki / secureboot page.
• Im' using apt package repository for kernel updates:

  $ cat /etc/apt/sources.list.d/linux-surface.list 
  deb [arch=amd64] https://pkg.surfacelinux.com/debian release main

• I'm using linux mint alongside original windows, using grub:
• grub 2.06-2ubuntu7
• grub-efi-amd64-signed 1.187.6+2.06-2

Environment

• Hardware model: Surface Pro 9 ; Core i5 I5-1245U ; 16GB RAM ; 256GB SSD

• Kernel version: cannot get exact version for 6.8.8 as it's not booting, but previous (working) is Linux nouksurface 6.8.6-surface-1 #1 SMP PREEMPT_DYNAMIC Tue Apr 16 12:48:24 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux)

• Distribution: Linux Mint 21.1 Mate (x64)

• /boot/config-6.8.8-surface-1.txt

$ diff /boot/config-6.8.6-surface-1 /boot/config-6.8.8-surface-1 
3c3
< # Linux/x86 6.8.6 Kernel Configuration
---
> # Linux/x86 6.8.8 Kernel Configuration
556,558c556
< # CONFIG_SPECTRE_BHI_ON is not set
< # CONFIG_SPECTRE_BHI_OFF is not set
< CONFIG_SPECTRE_BHI_AUTO=y
---
> CONFIG_MITIGATION_SPECTRE_BHI=y

Best regards.

[nouknouk]

nevermind: after a full fresh reinstall of minux mint 21.2, kernel 6.8.8 is running well.

The root cause was probably elsewhere.