Comment 42 for bug 1813657

Uhm... Sorry for that, I seem to have triggered some keyboard shortcut. To continue:

1. Additional line in 4.18.0-14
Line 355: [ 0.034459] Spectre V2 : Spectre v2 cross-process SMT mitigation: Enabling STIBP

2. Additional line in 4.18.0-14
Line 590: [ 0.124079] pci 0000:00:02.0: BIOS left Intel GPU interrupts enabled; disabling

3. 3 missing lines that were present in 4.18.0-13
[ 1.362647] ata_port ata2: hash matches
[ 1.362648] ata2: hash matches
[ 1.362709] acpi device:16: hash matches

4. A BUG message in 4.18.0-14
[ 3.103113] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
[ 3.103116] PGD 0 P4D 0
[ 3.103119] Oops: 0000 [#1] SMP PTI
[ 3.103122] CPU: 2 PID: 194 Comm: systemd-udevd Not tainted 4.18.0-14-generic #15-Ubuntu
[ 3.103123] Hardware name: /DH55TC, BIOS TCIBX10H.86A.0048.2011.1206.1342 12/06/2011
[ 3.103179] RIP: 0010:gen4_render_ring_flush+0x60/0x110 [i915]
[ 3.103180] Code: 00 48 89 df e8 51 fe ff ff 48 3d 00 f0 ff ff 77 6c 44 89 20 48 8d 48 44 c7 40 04 02 40 00 7a 48 8b 53 78 48 8b 92 10 02 00 00 <48> 8b 52 08 48 c7 40 0c 00 00 00 00 83 ca 04 89 50 08 48 8d 50 14
[ 3.103201] RSP: 0018:ffffb489011ab978 EFLAGS: 00010287
[ 3.103202] RAX: ffffb489101da000 RBX: ffff9a78d63c0b40 RCX: ffffb489101da044
[ 3.103204] RDX: 0000000000000000 RSI: 00000000000001a8 RDI: 0000000000000150
[ 3.103205] RBP: ffffb489011ab988 R08: 0000000000000001 R09: 0000000000000004
[ 3.103206] R10: ffff9a78ebfd1eb0 R11: ffff9a78d63c0b40 R12: 0000000002000022
[ 3.103207] R13: ffff9a78d63c0b40 R14: ffff9a78d5913800 R15: ffff9a78d5b08000
[ 3.103209] FS: 00007fc0c0bb98c0(0000) GS:ffff9a78e3280000(0000) knlGS:0000000000000000
[ 3.103211] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 3.103212] CR2: 0000000000000008 CR3: 0000000215cf4001 CR4: 00000000000206e0
[ 3.103213] Call Trace:
[ 3.103246] i915_request_alloc+0x24e/0x370 [i915]
[ 3.103276] i915_gem_init+0x26b/0x470 [i915]
[ 3.103303] i915_driver_load+0xab8/0xd80 [i915]

Now... One more interesting observation. I tried to boot 4.18.0-14 without splash screen. For this I edited the entry (using "e" in grub) to removed the lines
               load_video
               gfxmode $linux_gfx_mode
and also the paramters "quiet" and "splash" from the kernel commandline. The last line that was written to the screen was

[ 3.094622] fb: switching to inteldrmfb from EFI VGA

after that, the computer continued booting but the screen stayed blank. The BUG entrie and call trace (etc.) appear a few lines after that in the dmesg output.

Regards,
Jan