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[ 21.605999] caller os_map_kernel_space+0x86/0xb0 [nvidia] mapping multiple BARs
[ 25.793652] Bluetooth: RFCOMM TTY layer initialized
[ 25.793661] Bluetooth: RFCOMM socket layer initialized
[ 25.793673] Bluetooth: RFCOMM ver 1.11
[ 29.311023] r8169 0000:04:00.0 enp4s0: link up
[ 29.311039] IPv6: ADDRCONF(NETDEV_CHANGE): enp4s0: link becomes ready
[ 858.055285] perf: interrupt took too long (2506 > 2500), lowering kernel.perf_event_max_sample_rate to 79750
[ 1234.991128] perf: interrupt took too long (3137 > 3132), lowering kernel.perf_event_max_sample_rate to 63750
[ 1384.783204] perf: interrupt took too long (3927 > 3921), lowering kernel.perf_event_max_sample_rate to 50750
[ 1692.722639] perf: interrupt took too long (4918 > 4908), lowering kernel.perf_event_max_sample_rate to 40500
BTW that is also what I see rught after the black screen. Now that I am thinking , assuming I am seeing the whole of what I get with dmesg at boot the black screen would be right at the beginning (OR before).
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[ 0.000000] microcode: microcode updated early to revision 0x5d, date = 2010-10-02
[ 0.000000] Linux version 4.15.0-33-generic (buildd@lcy01-amd64-024) (gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #36-Ubuntu SMP Wed Aug 15 16:00:05 UTC 2018 (Ubuntu 4.15.0-33.36-generic 4.15.18)
[ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-4.15.0-33-generic root=UUID=86d2e32b-2b49-4f19-85ce-82a3223b6300 ro verbose video=SVIDEO-1:d
[ 0.000000] KERNEL supported cpus:
[ 0.000000] Intel GenuineIntel
[ 0.000000] AMD AuthenticAMD
[ 0.000000] Centaur CentaurHauls
[ 0.000000] x86/fpu: x87 FPU will use FXSAVE
[ 0.000000] e820: BIOS-provided physical RAM map:
[ 0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009f7ff] usable
[ 0.000000] BIOS-e820: [mem 0x000000000009f800-0x000000000009ffff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000000f0000-0x00000000000fffff] reserved
[ 0.000000] BIOS-e820: [mem 0x0000000000100000-0x000000007fedffff] usable
[ 0.000000] BIOS-e820: [mem 0x000000007fee0000-0x000000007fee2fff] ACPI NVS
[ 0.000000] BIOS-e820: [mem 0x000000007fee3000-0x000000007feeffff] ACPI data
[ 0.000000] BIOS-e820: [mem 0x000000007fef0000-0x000000007fefffff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000f0000000-0x00000000f3ffffff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000fec00000-0x00000000ffffffff] reserved
[ 0.000000] NX (Execute Disable) protection: active
[ 0.000000] SMBIOS 2.4 present.