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Graphics issue on 5.14

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sporkinator
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Joined: 2021-09-16 03:19

Graphics issue on 5.14

#1 Post by sporkinator »

I compiled a low latency (timer=1000hz & preempt=y) 5.14.3 kernel using the experimental packaged 5.14 config (note I experienced the same issue when I used my old 5.10 config and updated it with make olddefconfig). I am using a 6800XT, so I made sure AMDGPU was enabled in the config. I also downloaded all the latest firmware and installed that in my /lib/firmware/.
Now when I select the menuentry for 5.14 I see some text fly by and then within a few seconds, before I even have the opportunity to decrypt LUKS, my monitor goes black and the monitor says its no longer receiving video input and a few seconds later powers off. When I use the nomodeset boot parameter, I am able to into 5.14.3 just fine. This leads me to believe this is a graphics issue. Occasionally I can get a bit farther without nomodeset (I can decrypt LUKS) but seconds later, some colors flash and the monitor stops getting the feed. I also have 5.10.8 installed and can use that fully with no issues. I cannot ssh in to my machine to monitor logs, nor do I have a serial port I can use to debug.
I will attempt to try and debug from qemu, but I have yet to learn how to properly emulate my host system through it yet so I must do that first. In the mean time, what are other ways I can log what happens when I boot without nomodeset? Does anybody care to speculate on what the issue may be? I'll take any and all suggestions :D

Aki
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Re: Graphics issue on 5.14

#2 Post by Aki »

Hello,

You could start Debian as single user to check if the system is stable.

Then, If it is stable, you could boot the system setting using multi-user.target as default target (not to start the graphical.target).

Then, if it works and it is stable, it is probably related to graphical stack.
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Re: Graphics issue on 5.14

#3 Post by sunrat »

It's hard to debug a custom compiled kernel on a forum, especially with no logs or error messages.
If your aim is (timer=1000hz & preempt=y) I suggest you try a Liquorix kernel which has those set by default. I've used it happily for a few years for audio production and also as my daily desktop.
To install, https://liquorix.net/#install . I actually pick my version rather than installing the metapackage as instructed on their site as Nvidia driver occasionally takes a few days/weeks to catch up to the new kernel version. Usually not a problem if not using nvidia driver.

Code: Select all

Currently:
apt list linux-image-5.14*
Listing... Done
linux-image-5.14.0-6.1-liquorix-amd64/stable 5.14-1.1~bullseye amd64
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Those who have lost data
...and those who have not lost data YET ”
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