Graphic card on PCI slot not appearing when listing

Support Graphics & Display
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1

Hello there!

I upgraded the RAM of the PC filling the 4 slots. I installed a clean UEFI Manjaro setup, but I can’t get the graphic card to work.
I listed available PCIs and dont find my card. The BIOS is set to go for the PCI before the IGD and I cannot think of something else.

$ lspci -k | grep -EA3 'VGA|3D|Display'
00:02.0 VGA compatible controller: Intel Corporation Alder Lake-S GT1 [UHD Graphics 770] (rev 0c)
	DeviceName: Onboard - Video
	Subsystem: Micro-Star International Co., Ltd. [MSI] Alder Lake-S GT1 [UHD Graphics 770]
	Kernel driver in use: i915

The cards is a RX 480 sahppire 8GB that is listed as UEFI supported card. This build (just the RAM change) was working fine a few hours ago in the same Kernel of manjaro.

Any one has any idea of what to check or double check? I don’t know what else to check since I cannot even reach the PCI. Any tip or suggestion would be most welcome.

$ inxi -G
Graphics:
  Device-1: Intel Alder Lake-S GT1 [UHD Graphics 770] driver: i915 v: kernel
  Device-2: Sunplus Innovation HD 720P webcam driver: snd-usb-audio,uvcvideo
    type: USB
  Device-3: AVerMedia Live Gamer Portable 2 Plus
    driver: snd-usb-audio,uvcvideo type: USB
  Display: x11 server: X.org v: 1.21.1.9 driver: X: loaded: modesetting
    dri: iris gpu: i915 resolution: <missing: xdpyinfo/xrandr>
    resolution: 1920x1080
  API: EGL v: 1.5 drivers: iris,swrast platforms: x11,surfaceless,device
  API: OpenGL v: 4.6 compat-v: 4.5 vendor: intel mesa v: 23.1.9-manjaro1.1
    renderer: Mesa Intel UHD Graphics 770 (ADL-S GT1)
2

Have you checked it is seated properly? Rechecked?

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I did. Even unpluged the power of it. The leds go all rainbowy when on.

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4

Fair enough. Had to ask.
From a quick search it appears this card is from ~2016, so I dont think its a compatibility or kernel series issue.

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I don’t think either. I will tear it apart later on and rebuild it, Im going crazy trying to get a clue…

6

Is the slot used here?

sudo dmidecode -t slot

Does the power supply provide enough power for the GPU? Usually needs external power.

7

Have you tried to switch slots? The first or the second slot is often the best choice for the primary GPU.

Have you tried resetting the firmware to defaults - save and reboot - usually PEG is chosen when selection is set to auto.

I would like to emphasize the enough power - the leds going rainbowy does indicate the card is getting power - but enough?

How much juice can be delivered from your PSU?

That indicates a power hungry board and CPU - UHD Graphics 770 - you may have been close to the PSU limits with your previous card I reckon.

8

I went to sleep and when i woke up I disconected everything and clean the PC intensly. I reconnect everything and started working again. I think It might not have been the PCI status, but the PSU as @linux-aarhus said.

I would like to emphasize the enough power - the leds going rainbowy does indicate the card is getting power - but enough?

Since was been powered by 2 diferent cables 1 of those might have come loose at some point and must have not checked good enought.

Thnks all for your time and help

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