Hi Vitaly > From: Vitaly Zaitsev via devel <devel@lists.fedoraproject.org> > Sent: Friday, May 1, 2020 7:05 AM > > On 01.05.2020 12:52, Peter Robinson wrote: > > I bet this is actually the Intel Dynamic Platform and Thermal > > Framework (DPTF) that's at fault here [1] and so while I'm sure Lenovo > > can approach Intel and assist I'm not sure it's something they can fix > > directly, on the plus side it looks like it's being reverse engineered > > in general. > > This is definitely Lenovo's fault. I have also Dell XPS 13 and it works > absolutely fine on GNU/Linux. Not throttling issues at all. > Afraid I somewhat disagree. I think we should have done more earlier, but I don't think the root cause is ours.
I have no idea how the Dell XPS 13 solves this issue (or if it had the same in the first place) but my understanding of the problem is needing the adaptive support from DPTF to detect between lap and desk mode. We have to meet some temperature safety requirements when the device is on lap. Because Linux doesn't have support for that the device defaults to the 'safer' power setting and you see thermal throttling (and lower performance than Windows). The new firmware does that lap/desk mode detection - and I'm told implementing that in the BIOS/EC firmware framework was non-trivial, It was done purely for Linux customers. The performance now for Linux users should be the same as for Windows users. I think if DPTF had been open-sourced the thermal throttling would have been a non-issue. I can't comment on why that hasn't happen - I think really that's a question for Intel. Perhaps there are better solutions possible? They all get a bit vendor specific and I suspect would have been hard to upstream so firmware is a reasonable fix in my opinion. Mark _______________________________________________ devel mailing list -- devel@lists.fedoraproject.org To unsubscribe send an email to devel-le...@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org
