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(2001-1c00-0c1e-bf00-d69d-5353-dba5-ee81.cable.dynamic.v6.ziggo.nl. [2001:1c00:c1e:bf00:d69d:5353:dba5:ee81]) by smtp.gmail.com with ESMTPSA id y9-20020aa7d509000000b0045ce419ecffsm1282393edq.58.2022.11.05.08.17.47 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 05 Nov 2022 08:17:48 -0700 (PDT) Message-ID: Date: Sat, 5 Nov 2022 16:17:46 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.3.1 Subject: Re: [RFC 0/2] ACPI: video: prefer native over vendor Content-Language: en-US, nl To: "Rafael J . Wysocki" Cc: Matthew Garrett , Len Brown , linux-acpi@vger.kernel.org References: <20221105145258.12700-1-hdegoede@redhat.com> From: Hans de Goede In-Reply-To: <20221105145258.12700-1-hdegoede@redhat.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Hi, On 11/5/22 15:52, Hans de Goede wrote: > Hi Rafael, Matthew, > > Here is a second attempt at always registering only a single > /sys/class/backlight device per panel. > > This first round of testing has shown that native works well even on > systems so old that the don't have acpi_video backlight control support. > > This patch series makes native be preferred over vendor, which should > avoid the problems seen with the 6.1 changes before the fixes. > > ATM there is one known model where this will cause a regression, > the Sony Vaio PCG-FRV3 from 2003. I plan to add a DMI quirk for that > in the next version of this series, but I'm waiting for some more > testing (to check that the vendor interface does actually work) first. > > I will also do another blogpost, focussing on asking users to see > if they have a laptop which provides a combination of vendor + native > backlight interfaces, which may be impacted by this series. This is > the main reason why this is a RFC for now. The blogpost requesting testing of laptops with a combination of vendor + native backlight interfaces can be found here: https://hansdegoede.dreamwidth.org/27024.html Regards, Hans