HDMI not being detected (but detected in W10 (Dual Boot))

Blaze7 · Today 09:47:37

Hardware: HP Pavilion Gaming 15-ec0xxx
CPU: AMD Ryzen 5 3550H
GPU: AMD Picasso/Raven2 Vega 8 (0x1002:0x15d8) — only GPU visible in lspci, GTX 1650 absent
Kernel: 7.0.10-arch1-1
Mesa: 26.1.1-2
linux-firmware-amdgpu: 20260519
Compositor: Hyprland 0.55.2 (Wayland)
Dual boot: Windows 11 (HDMI works fine there)

Issue:
HDMI-A-1 shows disconnected at kernel level with cable plugged in.
EDID returns 0 bytes, no hotplug events in dmesg, HPD pin never fires.

Key findings:
- amdgpu_dm_disable_hpd = 0
- dc = -1 (auto), DCN 1.0 initialized fine
- connector[97]: HDMI-A-1 exists in DRM state but crtc=(null)
- ATPX Hybrid Graphics detected (functions 0x00000001) but vgaswitcheroo not registered
- GTX 1650 completely absent from lspci
- Runtime PM not available

Tried:
- echo detect > /sys/class/drm/card1-HDMI-A-1/status
- amdgpu.dc=1 amdgpu.dpm=1 kernel params
- acpi_osi=! acpi_osi=Windows 2015
- Windows Fast Startup disabled + cold shutdown
- Downgraded mesa, linux-firmware-amdgpu, kernel individually — all still broken
- Kernel tested back to 6.19.11 — all broken, no older cache available

Broken since at least 6.19.11. Was working at some point before that.

neofetch

 DISTRO ?  Arch Linux x86_64
│ ├ ?  Linux 7.0.12-arch1-1
│ ├? ?  1097 (pacman)
│ └ ?  zsh 5.9.1
 DE/WM ?  Hyprland 0.55.4 (Wayland)
│ ├? ?  Papirus-Dark [Qt], Papirus-Dark [GTK2/3/4]
│ ├ ?  Bibata-Modern-Classic (24px)
│ ├ ?  JetBrainsMono Nerd Font (9pt)
│ └ ?  foot 1.27.0
? SYSTEM ?  HP Pavilion Gaming Laptop 15-ec0xxx
│ ├? ?  AMD Ryzen 5 3550H (8) @ 2.10 GHz
│ ├? ?  AMD Radeon Vega 8 Graphics
│ ├? ?  1920x1080 @ 60Hz
│ ├? ?  3.23 GiB / 5.65 GiB (57%)
│ ├? ?  40.00 KiB / 5.65 GiB (0%)
│ ├? ?  53 mins
│ └? ?  1920x1080 in 15", 60 Hz [Built-in]

Last edited by Blaze7 (Today 10:02:57)

V1del · Today 10:44:52

What's your HDMI connected to? If its the dGPU but that doesn't show in lspci then that will be a problem, make sure it's not disabled in your UEFI. You might also want to update first, you're at least a minor kernel release and two mesa releases out of date. Can you try to repro on the LTS kernel, which should still be a 6.18 base, which would preclude your problems (however if they've been introduced by stable release patches issues in this space could have been backported to it).

That said very little to actively go by here, post a system journal

sudo journalctl -b | curl -F 'file=@-'  https://paste.c-net.org/

Last edited by V1del (Today 10:50:01)

Blaze7 · Today 14:03:24

System journal:

https://paste.c-net.org/CopingBuckley

1 GTX 1650 is completely absent from lspci (only AMD Picasso/Raven2 is visible)
2 amdgpu detects ATPX Hybrid Graphics (functions 0x00000001) but vgaswitcheroo is not registered
3 tried Linux 6.18.36-1-lts, no results
I'm having a hard time accessing the BIOS on boot, i have no idea what the admin password is

seth · Today 14:05:46

Jun 23 10:53:54 arch kernel: pci 0000:01:00.0: [10de:1f91] type 00 class 0x030000 PCIe Legacy Endpoint
Jun 23 10:53:54 arch kernel: pci 0000:01:00.0: BAR 0 [mem 0xf6000000-0xf6ffffff]
Jun 23 10:53:54 arch kernel: pci 0000:01:00.0: BAR 1 [mem 0xc0000000-0xcfffffff 64bit pref]
Jun 23 10:53:54 arch kernel: pci 0000:01:00.0: BAR 3 [mem 0xd0000000-0xd1ffffff 64bit pref]
Jun 23 10:53:54 arch kernel: pci 0000:01:00.0: BAR 5 [io  0xf000-0xf07f]
Jun 23 10:53:54 arch kernel: pci 0000:01:00.0: ROM [mem 0xf7000000-0xf707ffff pref]
Jun 23 10:53:54 arch kernel: pci 0000:01:00.0: PME# supported from D0 D3hot
Jun 23 10:53:54 arch kernel: pci 0000:01:00.0: 63.008 Gb/s available PCIe bandwidth, limited by 8.0 GT/s PCIe x8 link at 0000:00:01.1 (capable of 126.016 Gb/s with 8.0 GT/s PCIe x16 link)
Jun 23 10:53:54 arch kernel: pci 0000:01:00.1: [10de:10fa] type 00 class 0x040300 PCIe Endpoint
Jun 23 10:53:54 arch kernel: pci 0000:01:00.1: BAR 0 [mem 0xf7080000-0xf7083fff]
Jun 23 10:53:54 arch kernel: pci 0000:01:00.0: vgaarb: bridge control possible
Jun 23 10:53:54 arch kernel: pci 0000:01:00.0: vgaarb: VGA device added: decodes=io+mem,owns=none,locks=none
Jun 23 10:53:54 arch kernel: acpi PNP0C01:00: Reserved [mem 0xf8000000-0xfbffffff]
Jun 23 10:53:54 arch kernel: pci 0000:01:00.1: extending delay after power-on from D3hot to 20 msec
Jun 23 10:53:54 arch kernel: pci 0000:01:00.1: D0 power state depends on 0000:01:00.0
Jun 23 10:53:54 arch kernel: pci 0000:01:00.0: Adding to iommu group 10
Jun 23 10:53:54 arch kernel: pci 0000:01:00.1: Adding to iommu group 10
Jun 23 10:53:54 arch kernel: tpm_crb MSFT0101:00: Disabling hwrng

Your Turing GPU is there but not picked up by any driver

pacman -Qs nvidia
dkms status

Edit:

Jun 23 10:53:54 arch kernel:  sda: sda1 sda2
Jun 23 10:53:54 arch kernel:  nvme0n1: p1 p2 p3 p4 p5 p6

in case there's a parallel windows installation see the 3rd link below. Mandatory.
Disable it (it's NOT the BIOS setting!) and reboot windows and linux twice for voodo reasons.

Last edited by seth (Today 14:07:21)

Arch Linux

#1 Today 09:47:37

HDMI not being detected (but detected in W10 (Dual Boot))

#2 Today 10:44:52

Re: HDMI not being detected (but detected in W10 (Dual Boot))

#3 Today 14:03:24

Re: HDMI not being detected (but detected in W10 (Dual Boot))

#4 Today 14:05:46

Re: HDMI not being detected (but detected in W10 (Dual Boot))

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