The LSM can be disabled this way: Check the contents of the file /sys/kernel/security/lsm (example contents: capability,lockdown,yama). There are two ways to get around this: You can either disable Secure Boot in your firmware settings, or disable the Kernel Lockdown LSM. Kernel Lockdown automatically enables some security measures when Secure Boot is enabled, among them restricted access to MSR and PCI BAR via /dev/mem, which this tool requires. Some time ago a feature called Kernel Lockdown was added to Linux. You also need dbus and gobject python bindings for listening to dbus signals on resume from sleep/hibernate. RequirementsĪ stripped down version of the python module python-periphery is now built-in and it is used for accessing the MCHBAR register by memory mapped I/O. You can lookup the values of your CPU at the Intel product website. For a i7-8650U normal would be 15W, up profile is setting it to 25W and down to 10W. On a lot of modern CPUs from Intel one can configure the TDP up or down based on predefined profiles. I have run Geekbench 4 and now I can get a score of 5391/17265! On balance_performance I can reach only 4672/16129, so 15% improvement in single core and 7% in multicore, not bad ) setting cTDP (EXPERIMENTAL) This feature can be enabled (in AC mode only) by setting to True the HWP_Mode parameter in the throttled config file. Since this value forces the CPU to full speed even during idle, a new experimental feature allows to automatically set HWP to performance under load and revert it to balanced when idle. By setting this value to performance I was able to reach 3900 MHz in the prime95 single core test, achieving a +400 MHz boost. By default TLP sets this value to balance_performance on AC in order to reduce the power consumption/heat in idle. The reason is the value for the HWP energy performance hints. For instance, when running prime95 (1 core, test #1) my CPU is limited to about 3500 MHz over the theoretical 4000 MHz maximum. I have found that under load my CPU was not always hitting max turbo frequency, in particular when using one/two cores only. As such, you should first find your system default values with the -monitor command. NOTE: the values specified in the config file are the actual current limit of your system, so those are not a offset from the default values as for the undervolt. You can now either use the ICCMAX key in config to set global values or the ICCMAX.AC and ICCMAX.BATTERY keys to selectively set current values for the two power profiles. The tool will re-apply IccMax on resume from standby and hibernate. The tool now supports overriding the IccMax by configuring the maximum allowed current for CPU, cache and GPU planes. = Notice that undervolt is typically locked from 10th gen onwards! = IccMax (EXPERTS ONLY) You can now either use the UNDERVOLT key in config to set global values or the UNDERVOLT.AC and UNDERVOLT.BATTERY keys to selectively set undervolt values for the two power profiles. The tool will re-apply undervolt on resume from standby and hibernate by listening to DBus signals. The tool supports undervolting the CPU by configuring voltage offsets for CPU, cache, GPU, System Agent and Analog I/O planes. ![]() I suggest you to use the excellent s-tui tool to check and monitor the CPU usage, frequency, power and temperature under load! Undervolt Is this tool really doing something on my PC? HP Probook 470 G5, Probook 450 G5, ZBook Firefly 15 G7.Other users have confirmed that the tool is also working for these laptops: The install script was updated, but please report back if anything breaks. The latest commit () switched from the legacy name lenovo_fix for the tool/config/system to a more uniform throttled. On systems where the EC doesn't reset the values (ex: ASUS Zenbook UX430UNR), the power limit can be altered by using the official intel_rapl driver (see Static fix for more information) Warning! The CPU package power limit (PL1/2) is forced to a value of 44 W (29 W on battery) and the temperature trip point to 95 'C (85 'C on battery) by overriding default values in MSR and MCHBAR every 5 seconds (30 on battery) to block the Embedded Controller from resetting these values to default. This tool was originally developed to fix Linux CPU throttling issues affecting Lenovo T480 / T480s / X1C6 as described here.
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