I am the happy owner of a Dell Precision 5540 with Ubuntu LTS since end 2020. Everything was going perfectly well until 2-3 weeks ago. Now when I have intense CPU usage (data analysis, or Kerbal Space Program for example), first the display lags, then it flickers. This only happens on the integrated display, not the external screen.
I have the nvidia-535 drivers, and my Ubuntu 22.04.3 is up-to-date. Normally, I use the Nvidia "On demand" mode : the integrated display uses the Intel UHD Graphics. I tried to switch to the "Performance" mode with the integrated display on the Nvidia GPU. The problem is then a bit different: the screen goes black during intense CPU usage, without flickering.
I am currently under linux-kernel 6.5. I tried kernel 6.2 with the same issue happening. I do not dare trying with kernels 5.*.
I added the line
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i915.enable_dc=0 intel_idle.max_cstate=2to /etc/default/grub and admittedly, the problem that used to happen even with a quiet CPU usage is now restrained to intense CPU usage.
However, this is still annoying because I use this laptop for some local computations before moving to larger computing resources. For three years I had absolutely no problem.
If anyone has an idea, I would be very grateful.
Some edit on Feb. 2nd:
The problem seems to be related to an overheating of the CPU. Here is the result of the sensors command:
coretemp-isa-0000Adapter: ISA adapterPackage id 0: +100.0°C (high = +100.0°C, crit = +100.0°C)Core 0: +96.0°C (high = +100.0°C, crit = +100.0°C)Core 1: +94.0°C (high = +100.0°C, crit = +100.0°C)Core 2: +100.0°C (high = +100.0°C, crit = +100.0°C)Core 3: +91.0°C (high = +100.0°C, crit = +100.0°C)Core 4: +92.0°C (high = +100.0°C, crit = +100.0°C)Core 5: +91.0°C (high = +100.0°C, crit = +100.0°C)dell_smm-isa-0000Adapter: ISA adapterfan1: 4335 RPM (min = 0 RPM, max = 5100 RPM)fan2: 4330 RPM (min = 0 RPM, max = 5100 RPM)temp1: +98.0°C temp2: +53.0°C temp3: +57.0°C temp4: +61.0°C temp5: +72.0°C temp6: +52.0°C temp7: +38.0°C temp8: +39.0°C temp9: +68.0°C temp10: +70.0°C ucsi_source_psy_USBC000:001-isa-0000Adapter: ISA adapterin0: 5.00 V (min = +5.00 V, max = +5.00 V)curr1: 0.00 A (max = +0.00 A)BAT0-acpi-0Adapter: ACPI interfacein0: 12.69 V curr1: 1000.00 uA iwlwifi_1-virtual-0Adapter: Virtual devicetemp1: +37.0°C pch_cannonlake-virtual-0Adapter: Virtual devicetemp1: +46.0°C nvme-pci-3d00Adapter: PCI adapterComposite: +40.9°C (low = -273.1°C, high = +82.8°C) (crit = +84.8°C)Sensor 1: +40.9°C (low = -273.1°C, high = +65261.8°C)Sensor 2: +37.9°C (low = -273.1°C, high = +65261.8°C)acpitz-acpi-0Adapter: ACPI interfacetemp1: +25.0°C (crit = +107.0°C)Interestingly, the Dell diagnostics in pre-boot do not detect anything. Could it be that something in Linux now allow the processor to work above some threshold ?