linux-kernel - Re: [External] [PATCH] platform/x86: thinkpad_acpi: Explicitly set to balanced mode on startup

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:   Fri, 19 Aug 2022 13:00:30 -0500
From:   "Limonciello, Mario" <mario.limonciello@....com>
To:     Mark Pearson <markpearson@...ovo.com>,
        Henrique de Moraes Holschuh <hmh@....eng.br>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <markgross@...nel.org>
Cc:     madcatx@...as.cz, ibm-acpi-devel@...ts.sourceforge.net,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [External] [PATCH] platform/x86: thinkpad_acpi: Explicitly set to
 balanced mode on startup

On 8/19/2022 11:57, Mark Pearson wrote:
> 
> 
> On 2022-08-19 10:01, Mario Limonciello wrote:
>> It was observed that on a Thinkpad T14 Gen1 (AMD) that the platform
>> profile is starting up in 'low-power' mode after refreshing what the
>> firmware had.  This is most likely a firmware bug, but as a harmless
>> workaround set the default profile to 'balanced' at thinkpad_acpi startup.
>>
>> Reported-and-tested-by: madcatx@...as.cz
>> Link: https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbugzilla.kernel.org%2Fshow_bug.cgi%3Fid%3D216347&amp;data=05%7C01%7Cmario.limonciello%40amd.com%7C7f33822a8c2c428fdb0b08da8203f783%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637965250825035615%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=ua0qRTvx6MmngRCYI8TxgaTjLrd2fnRNtUhA0%2BRS6S8%3D&amp;reserved=0>> Signed-off-by: Mario Limonciello <mario.limonciello@....com>
>> ---
>>   drivers/platform/x86/thinkpad_acpi.c | 7 +------
>>   1 file changed, 1 insertion(+), 6 deletions(-)
>>
>> diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
>> index 22d4e8633e30..e7e86c0b9ad7 100644
>> --- a/drivers/platform/x86/thinkpad_acpi.c
>> +++ b/drivers/platform/x86/thinkpad_acpi.c
>> @@ -10590,12 +10590,7 @@ static int tpacpi_dytc_profile_init(struct ibm_init_struct *iibm)
>>   		return -ENODEV;
>>   
>>   	/* Ensure initial values are correct */
>> -	dytc_profile_refresh();
>> -
>> -	/* Set AMT correctly now we know current profile */
>> -	if ((dytc_capabilities & BIT(DYTC_FC_PSC)) &&
>> -	    (dytc_capabilities & BIT(DYTC_FC_AMT)))
>> -	    dytc_control_amt(dytc_current_profile == PLATFORM_PROFILE_BALANCED);
>> +	dytc_profile_set(NULL, PLATFORM_PROFILE_BALANCED);
>>   
>>   	return 0;
>>   }
> I'm hesitant on this and would like some time to dig into it first.
> 
> I worry that this would be overriding the setting in the BIOS. On the
> Intel platforms (at least on the mobile workstations) we can set the
> default power setting in the BIOS. I don't see this on the T14 AMD G1 -
> and haven't had a chance to check other platforms so its less of a
> concern there.

Ah wasn't aware you stored it for some systems.

> 
> As a compromise I'd want to force the profile to balanced on the PSC
> modes only.
> 
> Ideally, if this is a FW bug we should get it fixed in FW. I know our FW
> team can be a bit slow, but I'd rather hold off a few more days until I
> have a better idea where the issue is. I don't really understand why the
> person with the original issue is seeing the behaviour that they are.
> 
> Mark

Sure; I'll send out a v2 to that effect.