4 ms·

I think a lot of laptops do this because their cooling system is too weak for the CPU. The Lenovo Thinkpad t480s comes to my mind: with factory settings, the C

by venj 3y ago

I think a lot of laptops do this because their cooling system is too weak for the CPU. The Lenovo Thinkpad t480s comes to my mind: with factory settings, the CPU was unable to reach its advertised boost frequency nor maintain its max non-boost frequency for more than a few minutes. After 5 to 10 minutes, the machine was usually running at 300/400mhz under its advertised clock speed. Undervolting helped a lot but could not fix the issue completely, under clocking was the only solution to maintain a consistent clock speed.

sgarland 3y ago
IMO, at least with x86, there is a point where it simply doesn’t make sense to cram higher clocks into a laptop. The last Intel MBP could be had with an i9, and IME if you left turbo enabled, even at idle the fans were annoyingly loud. If you pushed it, you’d get a quiet jet engine as they struggled to keep temps just below 95 C. It was usually less annoying for me to just disable turbo, and only turn it on if I really needed the boost.
Zak 3y ago
Thinkpads, for a long time have had a fan speed that's possible, but never reached by the firmware's automatic mode. On Linux, this sets the fan to its true maximum: # echo disengaged > /proc/acpi/ibm/fan I use the thinkfan utility to run the fan more aggressively, including 'disengaged' over 70C.
- nottorp 3y ago
  How's your hearing? If any left.
  - Zak 3y ago
    I put in foam-tipped earbuds if I'm doing a big compile or something, but the Ryzen 6850u runs pretty cool most of the time.
- venj 3y ago
  Indeed, and for the t480s we could undervolt the CPU to help with thermals but these are not normally accessible to the end user. So if you are an average user of a Lenovo laptop without technical skills, you probably have a machine that does not meet the advertised performance, and no way to fix it.
Perz1val 3y ago
This is likely the case with all but gaming laptops. Most users won't care about performance under consistent, heavy workload, as much as it loading that .docx in 2 instead of 6 seconds. That burst of performance is what makes the system feel snappy and fast. If the user is happy, it was well worth the money too.

by venj 3y ago

sgarland 3y ago

IMO, at least with x86, there is a point where it simply doesn’t make sense to cram higher clocks into a laptop. The last Intel MBP could be had with an i9, and IME if you left turbo enabled, even at idle the fans were annoyingly loud. If you pushed it, you’d get a quiet jet engine as they struggled to keep temps just below 95 C. It was usually less annoying for me to just disable turbo, and only turn it on if I really needed the boost.

Zak 3y ago

Thinkpads, for a long time have had a fan speed that's possible, but never reached by the firmware's automatic mode. On Linux, this sets the fan to its true maximum: # echo disengaged > /proc/acpi/ibm/fan I use the thinkfan utility to run the fan more aggressively, including 'disengaged' over 70C.

nottorp 3y ago
How's your hearing? If any left.
- Zak 3y ago
  I put in foam-tipped earbuds if I'm doing a big compile or something, but the Ryzen 6850u runs pretty cool most of the time.
venj 3y ago
Indeed, and for the t480s we could undervolt the CPU to help with thermals but these are not normally accessible to the end user. So if you are an average user of a Lenovo laptop without technical skills, you probably have a machine that does not meet the advertised performance, and no way to fix it.

Perz1val 3y ago

This is likely the case with all but gaming laptops. Most users won't care about performance under consistent, heavy workload, as much as it loading that .docx in 2 instead of 6 seconds. That burst of performance is what makes the system feel snappy and fast. If the user is happy, it was well worth the money too.