Hello Mario, Am Mon, 1 Jul 2024 10:07:59 -0500 schrieb Mario Limonciello <mario.limonciello@xxxxxxx>: > In the future, please send this to the regressions M/L and CC people > instead of just sending a private message. > > For now, I've added the @regressions and @stable mailing lists as > this is an issue you find exposed specifically in the LTS series. > > Hi Lars, > > Can you please test 6.9.7? If this is still failing, can you please > check 6.10-rc6? I've tested both, 6.9.7 and 6.10-rc6 and they both don't have that issue. I can disable CPU boost with both kernel versions. > I'd like to understand if we just have a missing commit to backport > or it's a problem in the mainline kernel as well. > > From the below description it's specifically with boost in passive > mode, right? I have only tested the passive mode on all my Ryzen systems and only my Zen4 machine shows this regression. > If 6.10-rc6 is still affected, can you please see if this commit > helps? https://git.kernel.org/pub/scm/linux/kernel/git/superm1/linux.git/commit/?h=linux-next&id=e8f555daacd3377bf691fdda2490c0b164e00085 > > This is going into 6.11-rc1. > > Perry, Jassmine, > > Can you try to repro this using bleeding-edge or linux-next branches? > > Thanks, > > On 7/1/2024 4:33, Huang, Ray wrote: > > [AMD Official Use Only - AMD Internal Distribution Only] > > > > Hi all, > > > > Could you please help for a quick fix? > > > > -----Original Message----- > > From: Lars Wendler <wendler.lars@xxxxxx> > > Sent: Monday, July 1, 2024 5:30 PM > > To: Huang, Ray <Ray.Huang@xxxxxxx> > > Cc: gregkh@xxxxxxxxxxxxxxxxxxx > > Subject: linux-6.6.y: Regression in amd-pstate cpufreq driver since > > 6.6.34 > > > > Hello dear kernel developers, > > > > I might have found a regression in the amd-pstate driver of > > linux-6.6 stable series. I haven't checked linux-master nor any > > other LTS branch. > > > > > > Now here's what I have found: > > > > Since linux-6.6.34 the following command fails: > > > > # echo 0 > /sys/devices/system/cpu/cpufreq/boost > > -bash: echo: write error: Invalid argument > > > > and indeed, disabling CPU boost seems to not work: > > > > # cat /sys/devices/system/cpu/cpufreq/boost > > 1 > > > > I have bisected the issue to commit > > 8f893e52b9e030a25ea62e31271bf930b01f2f07: > > > > cpufreq: amd-pstate: Fix the inconsistency in max frequency units > > > > commit e4731baaf29438508197d3a8a6d4f5a8c51663f8 upstream. > > > > Reverting that commit (even on latest linux-6.6 release) gives me > > back the ability to disable CPU boost again. > > > > I can only reproduce this bug on my Zen4 machine: > > > > # lscpu | grep "^Model name:" | sed 's@[[:space:]][[:space:]]\+@ > > @' Model name: AMD Ryzen 7 7745HX with Radeon Graphics > > > > My older Zen3 machines seem not to be affected by this issue. All > > my Ryzen systems run on latest linux-6.6 kernels and have the > > following configuration regarding amd-pstate: > > > > # zgrep -F AMD_PSTATE /proc/config.gz > > CONFIG_X86_AMD_PSTATE=y > > CONFIG_X86_AMD_PSTATE_DEFAULT_MODE=2 > > # CONFIG_X86_AMD_PSTATE_UT is not set > > > > > > If you need more information, please don't hesitate to ask. > > > > Kind regards > > Lars Wendler >
Attachment:
pgpQQRhLxx4oH.pgp
Description: Digitale Signatur von OpenPGP
