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Wed, 17 Nov 2021 03:28:29 +0000 Received: from PNZPR01MB4415.INDPRD01.PROD.OUTLOOK.COM ([fe80::cdc4:def5:dc73:28f7]) by PNZPR01MB4415.INDPRD01.PROD.OUTLOOK.COM ([fe80::cdc4:def5:dc73:28f7%7]) with mapi id 15.20.4690.026; Wed, 17 Nov 2021 03:28:29 +0000 From: Aditya Garg To: Thorsten Leemhuis CC: Orlando Chamberlain , Daniel Winkler , Greg KH , Johan Hedberg , "linux-bluetooth@vger.kernel.org" , Linux Kernel Mailing List , Luiz Augusto von Dentz , Marcel Holtmann , "regressions@lists.linux.dev" , Sonny Sasaka Subject: Re: [PATCHv2] Bluetooth: quirk disabling LE Read Transmit Power Thread-Topic: [PATCHv2] Bluetooth: quirk disabling LE Read Transmit Power Thread-Index: AQHX0vJ15A6zQVMGfEiNGmUN6kF0hKv3vuGAgA4gSACAAAxJAIAABrOAgAEuUwA= Date: Wed, 17 Nov 2021 03:28:29 +0000 Message-ID: <3B8E16FA-97BF-40E5-9149-BBC3E2A245FE@live.com> References: <4970a940-211b-25d6-edab-21a815313954@protonmail.com> <275acce4-9eab-9cba-7145-5a75a69ca530@protonmail.com> <20211001083412.3078-1-redecorating@protonmail.com> <972034A8-4B22-4FEE-9B37-C0A7C7ADD60C@live.com> <829A2DF8-818E-4AF1-84F9-49B5822F9146@live.com> <70a875d0-7162-d149-dbc1-c2f5e1a8e701@leemhuis.info> <20211116090128.17546-1-redecorating@protonmail.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-tmn: [yixy69B5a7CwT3obaPmWPw3r4nR6u3dwd74rRwgvinV0fdmacyeNnD4KYGPLmIVZ] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 78485d5a-e85e-4612-3ffb-08d9a97a52ff x-ms-traffictypediagnostic: PNZPR01MB4558: x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: m9rFu3wRNoLsVK0OPEn+Ubjb3Ed0C5hkBVpHE3P1O6I3FWHE8ZRxCTQQJJcAmL88CrZvUxu31fH49StukNyCRklMQyVduUF4KmKT83lynx23Yf/kOz0kp8yln8cMeedZMP+AScCAfih7nhVMswFKZGTzlycLrlto+A+1c6Nk2Ore5FMndl1UG6DdVKP9KDPAZPo7Yk5Wxcfet/e0cIFEwV+ENmvkEM1Qrd+D4sa90jK8OyC+D5vMSZ9t8I3fycDIIaGbpU9yDgll7jy/g1Qhu2ILg2fpra4nSOQlLwUKlGdFTMTPL5YJRaiEyXnBaAMLCNDCP08DE/vIRpv8lufM7d+UfIey3aqUH8xp5Sv5dLGyiLEyVgBdve0aW2WpIJF66I6UStfzqKqkVp3o569TkAJOwvwAd48GwllqQxwOYcLZNWuupIUHTnHjeyIHxMbq10+WRxWM1P3uogRjcHr6JdYqpqEkoEwC71tHMfWv0dCPlsSvdyblyhpfhMjiYZB9bbaWeRmRcJRohTh7SQT7yF90QxfQO18CyTE/J0bxEEQ= x-ms-exchange-antispam-messagedata-chunkcount: 1 x-ms-exchange-antispam-messagedata-0: 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 Content-Type: text/plain; charset="us-ascii" Content-ID: <5F99FB455A590F46B6E1BEE6C6FC7E17@INDPRD01.PROD.OUTLOOK.COM> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: sct-15-20-3174-20-msonline-outlook-a1a1a.templateTenant X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: PNZPR01MB4415.INDPRD01.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-RMS-PersistedConsumerOrg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-CrossTenant-Network-Message-Id: 78485d5a-e85e-4612-3ffb-08d9a97a52ff X-MS-Exchange-CrossTenant-originalarrivaltime: 17 Nov 2021 03:28:29.2204 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-CrossTenant-rms-persistedconsumerorg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-Transport-CrossTenantHeadersStamped: PNZPR01MB4558 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > On 16-Nov-2021, at 2:56 PM, Thorsten Leemhuis = wrote: >=20 > On 16.11.21 10:02, Orlando Chamberlain wrote: >>> Bluetooth maintainers, what's the status here? The proposed patch is >>> fixing a regression. It's not a recent one (it afaics was introduced in >>> v5.11-rc1). Nevertheless it would be good to get this finally resolved. >>> But this thread seems inactive for more than a week now. Or was progres= s >>> made, but is only visible somewhere else? >>=20 >> I think the best solution is getting broadcom to update their firmware, >> I've just sent them a message through a form on their website, I couldn'= t >> seem to get it to tell me "Your message has been sent", so it's possible >> that it didn't submit (more likely I've sent the same message several ti= mes). >>=20 >> If I hear back from them I'll send something here. >=20 > Thx for that. But FWIW: from the point of the regression tracker that's > not the best solution, as according to your report this is a regression. > IOW: we deal with something that used to up to a certain kernel version > and was broken by a change to the kernel. That is something frown upon > in Linux kernel development, hence changes introducing regression are > often quickly reverted, if they can't get fixed by follow up change quick= ly. >=20 > That sentence has two "quickly", as we want to prevent more people > running into the issue, resulting in a loss of trust. But that's what > will happen if we wait for a firmware update to get developed, tested, > published, and rolled out. And even then we can't expect users to have > the latest firmware installed when they switch to a new kernel. >=20 > Hence the best solution *afaics* might be: fix this in the kernel > somehow now with a workaround; once the firmware update is out, change > the kernel again to only apply the workaround if the old firmware is in u= se. I have an idea. Can we make LE Read Transmit Power as a module parameter an= d users can turn it off if it is causing trouble. I have a patch for the sa= me but haven't tested it yet. >=20 > At least that's how it looks to me from the outside. But as mentioned > earlier already: as a Linux kernel regression tracker I'm getting a lot > of reports on my table. I can only look briefly into most of them. > Therefore I unfortunately will get things wrong or miss something > important. I hope that's not the case here; if you think it is, don't > hesitate to tell me about it in a public reply. That's in everyone's > interest, as what I wrote above might be misleading to everyone reading > this, which is something I'd like to avoid. >=20 > Ciao, Thorsten (carrying his Linux kernel regression tracker hat)