I have a system76 lemur pro, a couple of years old. I started getting really weird behavior and crashes, and when I ran memtester, got plenty of errors. It’s 16 gig, 8 on the mb and 8 on a dimm. I pulled the 8 out and ran it again, no problems and the system performed fine.
So I looked on line and coundn’t find a direct replacement, so I ended up a 16gig dimm. Everything seemed to go well for a bit. I ran memtester with no errors. Computer boots and runs. Then - not sure if this started after an update or just right away, I started getting much more severe lockups. I ran memtester again without errors. I checked the nvme drive, no errors. I didn’t seem to not get a lockup in a tty, but mostly in DE (plasma). Keyboard might stop working while I can see widgets still active, or maybe screen freezes but mouse moves, but I can’t get to a tty.
I was checking journalctl, and not getting any new errors or anything odd. No kernel panics. I one got a cpu:7 is soft locked notification in kde and journal, but that just happened once.
I was going to reinstall to see if that had an effect, but before I did that I pulled the new dimm, and now the system is stable again. It leaves me scratching my head. Would going from 16 to 8 to 24 gigs of ram cause this error or if there is some odd incompatibility with the ram. I’m going to cross post this to the system76 forum. If there was a problem, would memtester throw an error?
I’ve tried different kernels, tried plugged in and not plugged in. I opened the computer and reset the memory. External monitors, keyboards, mice, Wifi vs ethernet, suspend or not. I’m kind of at a loss as I can’t think of why the memory would be causing this problem if it checks out and the system boots. I also can’t do something that consistently recreates the crash…except so far removing the dimm prevented it.
Here’s my inxi - this is without the memory, obviously. I’m also putting photo of original and purchased memory dimm
System: Kernel: 6.5.6-200.fc38.x86_64 arch: x86_64 bits: 64 compiler: gcc v: 2.39-9.fc38 Desktop: KDE Plasma v: 5.27.8 Distro: Fedora release 38 (Thirty Eight) Machine: Type: Laptop System: System76 product: Lemur Pro v: lemp9 serial: <superuser required> Mobo: System76 model: Lemur Pro v: lemp9 serial: <superuser required> UEFI: coreboot v: 2023-08-18_a8dd6c2 date: 08/18/2023 Battery: ID-1: BAT0 charge: 47.7 Wh (92.8%) condition: 51.4/73.9 Wh (69.6%) volts: 8.3 min: 7.7 model: Notebook BAT status: discharging CPU: Info: quad core model: Intel Core i5-10210U bits: 64 type: MT MCP arch: Comet/Whiskey Lake note: check rev: C cache: L1: 256 KiB L2: 1024 KiB L3: 6 MiB Speed (MHz): avg: 475 high: 1000 min/max: 400/4200 cores: 1: 400 2: 400 3: 400 4: 400 5: 400 6: 1000 7: 400 8: 400 bogomips: 33599 Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx Graphics: Device-1: Intel CometLake-U GT2 [UHD Graphics] vendor: CLEVO/KAPOK driver: i915 v: kernel arch: Gen-9.5 bus-ID: 00:02.0 Device-2: Chicony USB2.0 Camera driver: uvcvideo type: USB bus-ID: 1-7:2 Display: wayland server: X.org v: 1.20.14 with: Xwayland v: 22.1.9 compositor: kwin_wayland driver: X: loaded: modesetting unloaded: fbdev,vesa dri: iris gpu: i915 resolution: 1920x1080 API: EGL v: 1.5 drivers: iris,swrast platforms: active: wayland,x11,surfaceless,device inactive: gbm API: OpenGL v: 4.6 vendor: intel mesa v: 23.1.8 glx-v: 1.4 direct-render: yes renderer: Mesa Intel UHD Graphics (CML GT2) API: Vulkan v: 1.3.243 drivers: intel,llvmpipe surfaces: xcb,xlib,wayland devices: 2 Audio: Device-1: Intel Comet Lake PCH-LP cAVS vendor: CLEVO/KAPOK driver: snd_hda_intel v: kernel bus-ID: 00:1f.3 API: ALSA v: k6.5.6-200.fc38.x86_64 status: kernel-api Server-1: PipeWire v: 0.3.82 status: active Network: Device-1: Intel Comet Lake PCH-LP CNVi WiFi driver: iwlwifi v: kernel bus-ID: 00:14.3 IF: wlp0s20f3 state: up mac: <filter> IF-ID-1: wg-mullvad state: unknown speed: N/A duplex: N/A mac: N/A Bluetooth: Device-1: Intel Bluetooth 9460/9560 Jefferson Peak (JfP) driver: btusb v: 0.8 type: USB bus-ID: 1-10:3 Report: btmgmt ID: hci0 rfk-id: 0 state: up address: <filter> bt-v: 5.1 lmp-v: 10 Drives: Local Storage: total: 465.76 GiB used: 150.87 GiB (32.4%) ID-1: /dev/nvme0n1 vendor: Western Digital model: WDS500G2B0C-00PXH0 size: 465.76 GiB temp: 31.9 C Partition: ID-1: / size: 455.74 GiB used: 147.77 GiB (32.4%) fs: btrfs dev: /dev/dm-0 mapped: luks-aa73aa2a-6886-4979-8ef9-d08c0c408190 ID-2: /boot size: 973.4 MiB used: 303.9 MiB (31.2%) fs: ext4 dev: /dev/nvme0n1p3 ID-3: /boot/efi size: 3.99 GiB used: 2.81 GiB (70.4%) fs: vfat dev: /dev/nvme0n1p2 ID-4: /home size: 455.74 GiB used: 147.77 GiB (32.4%) fs: btrfs dev: /dev/dm-0 mapped: luks-aa73aa2a-6886-4979-8ef9-d08c0c408190 Swap: ID-1: swap-1 type: partition size: 4 GiB used: 0 KiB (0.0%) dev: /dev/nvme0n1p4 ID-2: swap-2 type: zram size: 7.62 GiB used: 0 KiB (0.0%) dev: /dev/zram0 Sensors: System Temperatures: cpu: 51.0 C pch: 39.0 C mobo: N/A Fan Speeds (rpm): cpu: 0 Info: Processes: 477 Uptime: 4m Memory: total: 8 GiB available: 7.62 GiB used: 2.45 GiB (32.2%) Init: systemd target: graphical (5) Compilers: gcc: 13.2.1 Packages: 17 note: see --rpm Shell: Bash v: 5.2.15 inxi: 3.3.30