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MrKomodoDragon
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Joined: 27 Dec 2023
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 Posted: Wed Dec 27, 2023 11:05 pm Post subject: No video output halfway through boot with RX 6700 XT |
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I just installed gentoo with a machine that has an AMD RX 6700 XT. I have linux-firmware installed, the issue is, about halfway through the boot seqeunce (see video below), the video output stops. I know the machine boots successfully as I can ssh in from another computer. What's the issue here? The only way to get video output for now is to use the "nomodeset" [/code]boot option. Let me know what logs you would like to debug this issue.
Boot video: http://0x0.st/Hg7H.mp4
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grknight
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Joined: 20 Feb 2015
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| Posted: Wed Dec 27, 2023 11:18 pm Post subject: |
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Please post dmesg output from an ssh session when the screen is black.
This can also be saved to /var/log/dmesg{,.old} by setting the right settings in /etc/conf.d/bootmisc |
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MrKomodoDragon
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grknight
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| Posted: Thu Dec 28, 2023 1:26 am Post subject: |
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| Code: | | [ 6.097338] amdgpu 0000:07:00.0: [drm] Cannot find any crtc or sizes |
This generally means no connection to a display was found for this chip.
Is this a discrete card or a laptop with integrated graphics? The latter may be run via another iGPU.
Showing lspci -nnk is the next step. |
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MrKomodoDragon
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Joined: 27 Dec 2023
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| Posted: Thu Dec 28, 2023 3:26 am Post subject: |
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The RX 6700 XT is a discrete graphics card, and this is a desktop tower with the RX 6700 XT being the only card in this machine, no integrated GPU.
lspci -nnk output: https://paste.gentoo.zip/Ef4rLzFt
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Banana
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NeddySeagoon
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Joined: 05 Jul 2003
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| Posted: Thu Dec 28, 2023 10:59 am Post subject: |
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MrKomodoDragon,
Your system starts using EFI Framebuffer and the display goes away when it tries to use the amdgpufb, which is broken.
| Code: | | [ 6.097338] amdgpu 0000:07:00.0: [drm] Cannot find any crtc or sizes |
can mean the the graphics card cannot read the EDID data from the display for whatever reason.
That can e as simple as the video cable not connected properly. Check both ends. or the EDID data being corrupt.
Its possible to provide the EDID data you want to use in a file, so that the file is used to set up the display.
What display - make and model do you have?
I've never used the kernel EDID override, just seen it in the kernel.
-- edit --
| Code: | $ dmesg
[ 0.000000] Linux version 6.1.67-gentoo-dist |
It may be worth trying the testing kernel too as 6.1.x is nearly a year old, feature wise.
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NeddySeagoon
Computer users fall into two groups:-
those that do backups
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MrKomodoDragon
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Joined: 27 Dec 2023
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| Posted: Thu Dec 28, 2023 3:08 pm Post subject: |
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I unplugged and replugged the HDMI cable to the monitor, and now it works????????. I'm going to try doing this cycle again to make sure it works
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Banana
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logrusx
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| Posted: Fri Dec 29, 2023 9:20 am Post subject: |
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| MrKomodoDragon wrote: | | I unplugged and replugged the HDMI cable to the monitor, and now it works????????. I'm going to try doing this cycle again to make sure it works |
| Banana wrote: | | Either the connectors or a bad cable. Glad you figured it out. |
Actually I too have been observing similar behavior under Wayland when I plug my TV through HDMI. It never detects it the first time unless I open Gnome Control Center and open the Displays tab. So it might not be a bad cable or connector. Although I too have suspicions for my cable that behavior is way more consistent than a bad cable or connector can be unless it's completely broken.
Best Regards,
Georgi |
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