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Bergo wrote: > It does make it work fine for me, I saw the clock/timing interference > and this sane this problem for Lenovo as well. Huh? I think you have a typo; but I don't know what you actually meant. So you're saying the timing patch helps your system as well? Thanks, > > On 4/24/25 11:11 AM, Mario Limonciello wrote: >> On 4/19/2025 1:03 PM, Mario Limonciello wrote: >>> On 4/19/2025 4:28 AM, M. Bergo wrote: >>>>  From 881e57c87b9595c186c2ca7e6d35d0a52c1a10c2 Mon Sep 17 00:00:00 2001 >>>> From: Marcus Bergo >>>> Date: Sat, 19 Apr 2025 05:19:05 -0300 >>>> Subject: [PATCH] ACPI: EC: Fix CPU frequency limitation on AMD >>>> platforms after >>>>   suspend/resume >>>> >>>> Several AMD-based laptop models (Lenovo P15v Gen 3, P16v Gen 1, HP >>>> EliteBook 845 G10) >>>> experience a CPU frequency limitation issue where the processor gets >>>> stuck at >>>> approximately 544MHz after resuming from suspend when the power cord >>>> is unplugged >>>> during sleep. This issue makes the systems practically unusable >>>> until a full >>>> power cycle is performed. >>>> >>>> The root cause was traced to commit b5539eb5ee70 ("ACPI: EC: Fix >>>> acpi_ec_dispatch_gpe()") which restored the behavior of clearing the >>>> GPE >>>> in acpi_ec_dispatch_gpe() function to prevent GPE storms. While this >>>> fix is >>>> necessary for most platforms to prevent excessive power consumption >>>> during >>>> suspend-to-idle, it causes problems on certain AMD platforms by >>>> interfering >>>> with the EC's ability to properly restore power management settings >>>> after resume. >>>> >>>> This patch implements a targeted workaround that: >>>> 1. Adds DMI-based detection for affected AMD platforms >>>> 2. Adds a function to check if we're in suspend-to-idle mode >>>> 3. Modifies the acpi_ec_dispatch_gpe() function to handle AMD >>>> platforms specially: >>>>     - For affected AMD platforms during suspend-to-idle, it advances >>>> the >>>>       transaction without clearing the GPE status bit >>>>     - For all other platforms, it maintains the existing behavior of >>>> clearing >>>>       the GPE status bit >>>> >>>> Testing was performed on a Lenovo P16v Gen 1 with AMD Ryzen 7 PRO >>>> 7840HS and >>>> confirmed that: >>>> 1. Without the patch, the CPU frequency is limited to 544MHz after the >>>>   suspend/unplug/resume sequence >>>> 2. With the patch applied, the CPU properly scales up to its maximum >>>> frequency >>>>     (5.1GHz) after the same sequence >>>> 3. No regressions were observed in other EC functionality (battery >>>> status, >>>>     keyboard backlight, etc.) >>>> 4. Multiple suspend/resume cycles with different power states were >>>> tested >>>>     without issues >>>> >>>> The patch was also verified not to affect the behavior on Intel- >>>> based systems, >>>> ensuring that the GPE storm prevention remains effective where needed. >>>> >>>> Fixes: b5539eb5ee70 ("ACPI: EC: Fix acpi_ec_dispatch_gpe()") >>>> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=218557 >>>> Reported-by: Mark Pearson >>>> Signed-off-by: Marcus Bergo >>> >>> Great finding with this being a potential root cause of this behavior >>> (at least from a Linux perspective). >>> >>> Although this helps, I'm not really a fan of the tech debt >>> accumulated by needing to quirk this on a system by system basis as a >>> bandage. >>> >>> At least for HP someone said that this commit happens to help them >>> for the same issue you're describing: >>> >>> https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform- >>> drivers- x86.git/commit/? >>> h=fixes&id=9f5595d5f03fd4dc640607a71e89a1daa68fd19d >>> >>> That was surprising to me, but it must be changing the timing of some >>> of the code running in HP's EC.  Since you happen to have a Lenovo >>> system does it happen to help the Lenovo EC too? >>> >>> Mark, comments please? >>> >> Someone just reported that the timing delay patch helped their Lenovo >> system as well.  Can you see if it helps you too?