Linux Mint used to freeze randomly even under light workloads while running an older kernel, requiring a hard power-off. After switching to a newer generic kernel, those random freezes stopped, but the system still becomes completely unresponsive when pushed hard—for example, when running two demanding games at the same time. On Windows 10, similar situations usually caused the game or application to stop responding while the operating system remained usable.
Is this expected behavior on Linux, or is it more specific to Mint, Ubuntu, or Debian-based systems? What could cause the entire system to lock up instead of individual programs failing first? RAM and drive health tests have not reported any errors, and the issue has also been reproduced on another machine. The system has a Ryzen 5 3600X, Radeon RX 6700 XT, 32 GB of DDR4 memory, a 256 GB system SSD, and two 1 TB NVMe game drives. Under Windows, CPU temperatures reportedly stayed below about 61°C, but Linux temperatures have not yet been monitored during a freeze. The system has about 2.1 GB of swap, and memory usage has not exceeded roughly 21 GB out of 32 GB.
4 Answers
It is possible for memory pressure or a memory leak to make the desktop appear frozen, but your reported peak of around 21 GB out of 32 GB makes ordinary RAM exhaustion less likely. Still check swap activity and memory use with tools such as `free`, `top`, or a system monitor while testing. If the system is still responsive over SSH, collect logs instead of immediately power-cycling.
A complete lockup under load is more suspicious for hardware, power, cooling, or a graphics driver problem than for normal Linux behavior. I would check the power supply, motherboard, GPU stability, and temperatures while reproducing the issue. A RAM test is also worth running again, preferably for several passes or overnight.
Since changing kernels affected the behavior, a kernel, GPU driver, or graphics stack regression is also possible. Try a known stable kernel and compare with another Linux distribution or a different desktop session. Look through the previous boot's journal after rebooting, especially for GPU resets, hardware errors, thermal events, or out-of-memory messages.
Check the thermal readings during a Linux workload rather than assuming they match Windows. A CPU or GPU overheating event can cause a hard freeze, and fan control or driver behavior may differ between operating systems. Cleaning the system, checking fan curves, and inspecting or renewing thermal paste may help if temperatures rise sharply.
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