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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 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