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Subject: Re: [Intel-wired-lan] [PATCH iwl-net v2 1/1] e1000e: reconfigure PLL clock gate value and re-enable K1 on Meteor Lake X-BeenThere: intel-wired-lan@osuosl.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Intel Wired Ethernet Linux Kernel Driver Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" On 01/04/2026 11:19, Ruinskiy, Dima wrote: > On 01/04/2026 10:25, Timo Teras wrote: >> Hi >> >> On Wed, 1 Apr 2026 10:07:45 +0300 >> "Ruinskiy, Dima" wrote: >> >>> On 25/03/2026 17:49, Ruinskiy, Dima wrote: >>>> On 26/02/2026 14:36, Timo Teras wrote: >>>>> Yes, generally maintaining a large quirk set is infeasible. >>>>> >>>>> But this is my point: if the affected set of machines with this issue >>>>> is so large that maintaining a quirk set becomes infeasible, then >>>>> the proposed change will make life very difficult for large enough >>>>> set of people that a better solution should be devised. >>>> At this point, with the current PLL change, it looks like the number of >>>> affected systems would be smaller than would be with the previous PLL >>>> value. >>>> >>>> So far we have not received additional reports of regressions caused by >>>> this patch, other than yours. So, perhaps, the it can be manageable >>>> with >>>> a DMI quirk approach. I went ahead and implemented the infrastructure, >>>> it's actually quite a small change, and does what I want (automatically >>>> alters the default value of the K1 disable flag). >> >> I would not make quick judgement on not receiving any reports that there >> is not other hardware where this causes issues. I do hope this is >> the situation. But as it happened in the past the reports start typically >> with a delay after the commit makes it into an upstream release. >> >> We had the patched kernel with the PLL change running for a bit longer >> time, and we observed that it also caused packet loss / very slow network >> issues in the Dell laptop. Especially with the later suggested value >> 0x226. >> >>>> Could you share the DMI IDs of your system, where the issue is >>>> observed? >>>> Most likely the sys_vendor, product_family and product_name, located >>>> under /sys/class/dmi/id would be the most useful. I can add them as an >>>> initial DMI table entry for v3 of this patch (or a follow-up patch). >> >> sys_vendor: Dell Inc. >> product_family: Dell Pro Laptops >> product_name: Dell Pro 16 Plus PB16250 >> >> See also the original report for a full dmesg at: >> https://lists.osuosl.org/pipermail/intel-wired-lan/Week-of- >> Mon-20250623/048860.html >> >>  From dmesg: >> >> DMI: Dell Inc. Dell Pro 16 Plus PB16250/0W8RP8, BIOS 2.3.1 05/16/2025 >> e1000e 0000:00:1f.6 eth0: MAC: 16, PHY: 12, PBA No: FFFFFF-0FF >> >> I would not be surprised if other Dell models with same chipset are >> affected. But this is the only one I have available to test with. >> >> Maybe its worth to check based on sys_vendor and/or product_family >> together with the MAC and/or PHY version? That is to exclude >> product_name? >> >> Thanks! >> >> Timo > Hi Timo, > > You are correct that there will be higher coverage when the commit > reaches upstream, however we have to start somewhere, and so far you > have been the only one to report back specifically on the new version, > thank you for this, by the way. :) > > The value of 0x226 was computed as a theoretical upper bound, and as > such am not totally surprised that it brings its own issues. I do not > plan to use 0x226 in the patch. > > I managed some testing with a Dell Pro Max from the same generation, > which did not hit even the original issue. So I would not want to > exclude too broad of a family until/unless I get more reports. > > MAC type will be 16 or higher on all potentially affected systems, while > PHY type is 12 on any I219 device. Currently it seems that the most > accurate check would be MAC type + product name. > > --Dima V3 sent: https://patchwork.ozlabs.org/project/intel-wired-lan/patch/20260417104330.3031987-1-dima.ruinskiy@intel.com/