I'm spending way too much time on this, but since I'm debugging Linux things on the Late 2009 Macmini3,1 anyway - found out how to get rid of the "irq 20: nobody cared (try booting with the "irqpoll" option) [..] Disabling IRQ #20" kernel oops on boot:

I looked at everything that sits on IRQ 20 (as it turns out, ohci-pci,snd_hda_intel,wl), and added missing kernel modules for the latter two the the initramfs. Now they get loaded early on, and the message is gone.

(...and as it turns out, snd_hda_intel now gets remapped to IRQ 18.)

Unfortunately, the occasional display corruption problems persist. Guess I'll need to play with nouveau options?


...aaand another two crashes in nouveau today.

Updated to the latest bullseye-backports kernel (5.16.12-1~bpo11+1) to see if it makes any difference.

@galaxis Which nvidia GPU do you have? I also have nouveau issues and lots of kernel messages like in the screenshot.

@kuleszdl It's an ancient GeForce 9400 in a 2009 Mac Mini in my case. There was no such problem when I ran on Debian buster / LMDE4 :flan_shrug:

I don't get anything similar to your messages though. Last one was:

kernel: general protection fault, probably for non-canonical address 0xa5349b41fc600a3f: 0000 [#1] SMP PTI
kernel: nouveau_gem_object_close+0x118/0x210 [nouveau]
kernel: drm_gem_object_release_handle+0x30/0x90 [drm]

@galaxis Looks like a different issue then. But well, I've had these nouveau issues since a long time, also on older Debian versions. Well, I'm eager to see if the backport kernel (why don't you use the one from unstable instead btw?) works better for you.

@kuleszdl Could try unstable too, it's just that backports are enabled by default in LMDE.

Trying the Nvidia binary drivers instead would probably take some work too, I see just now that nvidia-detect tells me:

Detected NVIDIA GPUs:
02:00.0 VGA compatible controller [0300]: NVIDIA Corporation C79 [GeForce 9400] [10de:0861] (rev b1)

Checking card: NVIDIA Corporation C79 [GeForce 9400] (rev b1)
Your card is only supported by the 340 legacy drivers series, which is only available up to buster.

@galaxis closed source + legacy and unsupported = probably not really secure. :)

Hrm. Added a few kernel options that I'd seen mentioned in regards to problems with old Nvidia graphics chips and Linux (tsc=unstable enable_mtrr_cleanup), and haven't seen any further problems today. Just don't know if that's by chance or actually due to those changes.
Ok, I could revert the config and reboot to see if the display corruption reappeears, but probably won't when everything seems to be running fine right now.

@galaxis There should be a custom emoji of Linus flipping the finger, just for these situations 😅

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