I think, we have a problem here, that needs to be solved on multiple issues.
* there's throttling hitting in to avoid a dGPU reach its fall-off limit which is 76° (T580, i7-8550u, MX150). The only possible way to stay below this thermal limit is to power down the CPU massively, which leads to => * the dGPU isn't throttling down itself enough. In tests (glxsphere) my findings are: dGPU runs at about 1600-1700Mhz, not going down further. I guess this is a result of the gpu itself has a thermal limit of around 95° and gpu's own throttling will kick in much later than 76°, making the gpu not helping in cooling down with slowing down more. I wasn't able to get a reading of the power consumed by gpu, nvidia-smi does not offer these (nvidia-396). Thus leading to => * There's an imbalance between gpu's and cpu's abilities to thermal adapt. As gpu isn't able to, cpu is and does which leads to => a) a system running on brakes to manage heat, for to stay below a poosible gpu fall-off (full gpu power and frequency stable along time with cpu going down to only 3-5W or b) a system running at the possible performance with using the cpu's full potential, but only being able to use ⅓ of dGPU's capacities Conclusion from my perspective: There's a need to balance :-) * there's a need to have influence on gpu's abilities to throttle earlier (=> nvidia) * Lenovo-fix being enhanced to provide some kind of profiles, which are dynamically providing usecase profiles (easiest way to test is: set temp in Lenovo-fix to max 75°. As both, cpu & dGPU producing heat and 76° is fall-off, staying below that keeps system from throttling.) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1763144 Title: Significantly lower power and thermal limits on ThinkPad T480s (and probably others) than on Windows To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763144/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
