I have an optimus laptop, and after the update to KDE6 optimus-manager stopped working. I needed a second display, and all my display outputs are on the Nvdia GPU, so I needed to switch. I tried many different X11 configs, envycontrol then more X11 configs, but I couldn't get it working right, it would only be the internal display or the external one, not both. after a few hours I gave up and tried optimus-manager again. This time I checked the error log and it was failing to load the nvidia module, I tried loading it manually but I got a "No such device" error, which is where the title of the post comes in. My GPU has disappeared from linux, it won't show up in lspci, lshw, nvidia-smi, or anything else it should. The only reference to the thing in dmesg I can find are :

[    0.216410] pci 0000:01:00.0: [10de:1ba1] type 00 class 0x030000
[    0.216419] pci 0000:01:00.0: reg 0x10: [mem 0xde000000-0xdeffffff]
[    0.216427] pci 0000:01:00.0: reg 0x14: [mem 0xc0000000-0xcfffffff 64bit pref]
[    0.216435] pci 0000:01:00.0: reg 0x1c: [mem 0xd0000000-0xd1ffffff 64bit pref]
[    0.216440] pci 0000:01:00.0: reg 0x24: [io  0xe000-0xe07f]
[    0.216445] pci 0000:01:00.0: reg 0x30: [mem 0xdf000000-0xdf07ffff pref]
[    0.216460] pci 0000:01:00.0: Enabling HDA controller
[    0.257300] pci 0000:01:00.0: vgaarb: bridge control possible
[    0.257300] pci 0000:01:00.0: vgaarb: VGA device added: decodes=io+mem,owns=none,locks=none
[    0.270521] pci 0000:01:00.1: D0 power state depends on 0000:01:00.0

and then nothing, it doesn't even seem to try to load the nvidia module. I tried booting into windows and it shows up there fine, so the GPU didn't randomly die.
As far as I can tell I've rolled back everything I did in my histfile until it stopped working, The only thing I could think is I upgraded my kernel to (6.7.9) from (6.6.10), could that have caused it? I also tried adding pcie_port_pm=off to the kernel params from the archwiki, but still nothing. I'm just at a loss here, anyone have any ideas?

EDIT: I'm using the nvidia-dkms package
EDIT2: one kernel downgrade later and it's still not appearing, so thats not it.
EDIT3: fixed, see comments

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I needed a PC to test a PCIe card recently, so I put something together with some spare parts. The only PSU I had around was a corsair CX750M I took from a prebuild from about 2014-2015, one with the green labels. Searching around the internet I see loads of people saying not to buy them, but what about one I already have? How bad really it is? Will it fry my motherboard or burn my house down? Or is it just inefficient?

I was found a listing on eBay for a "Mellanox CX354A ConnectX-3 FDR Infiniband 40GbE QSFP+" card for quite cheap. By the sound of the listing title it supports both infiniband and 40GbE, is that right? I would like to try out infiniband, but I would be buying for the 40GbE. And are there good drivers for modern linux distros for this card? Also, do I just buy some QSFP cables to direct attach them?

I have 3 old SCSI HDDs that were in a hardware RAID, I don't have the RAID controller anymore but I have imaged them with DD and a SCSI PCI card I have.
Is there any way to assemble this array in software on Linux? I just want to get the data off so read only is fine.
Running blkid on the drive shows it as an Adaptec RAID member.
I believe the drives are in RAID 5.

EDIT: I got it working, but I had to use windows. I installed ReclaiMe Free RAID Recovery to find the RAID parameters then used the UFS explorer Pro free trial to image the array to a virtual disk. After a quick (actual quite long) chkdsk I managed to mount the NTFS file system on the array

EDIT2: There seem to be a lot of missing files, I don't think there was anything important on here anyway

EDIT3: wow, the found.000 folder is huge. I guess the recovery failed, or the array got pretty badly corrupted on the ~10 years in storage.

!wave