From mboxrd@z Thu Jan 1 00:00:00 1970 From: Valdis.Kletnieks@vt.edu Subject: Re: linux-next 20160512 - ACPI issue with screen brightness Date: Fri, 20 May 2016 03:02:08 -0400 Message-ID: <2897.1463727728@turing-police.cc.vt.edu> References: <4736.1463510462@turing-police.cc.vt.edu> <6459.1463698397@turing-police.cc.vt.edu> <7208.1463713500@turing-police.cc.vt.edu> <6674547c-cefb-1b93-893a-7c5909a180a7@intel.com> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="==_Exmh_1463727728_2055P"; micalg=pgp-sha1; protocol="application/pgp-signature" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <6674547c-cefb-1b93-893a-7c5909a180a7@intel.com> Sender: linux-kernel-owner@vger.kernel.org To: Aaron Lu Cc: "Rafael J. Wysocki" , "Rafael J. Wysocki" , Linux Kernel Mailing List , ACPI Devel Maling List , Len Brown List-Id: linux-acpi@vger.kernel.org --==_Exmh_1463727728_2055P Content-Type: text/plain; charset=us-ascii On Fri, 20 May 2016 13:45:30 +0800, Aaron Lu said: > On 05/20/2016 11:05 AM, Valdis.Kletnieks@vt.edu wrote: > > On Thu, 19 May 2016 18:53:17 -0400, Valdis.Kletnieks@vt.edu said: > > > >>>> next-20160512 sets the screen brightness to about 40%-ish or so, rather > >>>> than the 100% intensity I want. > > Do you mean after boot, the screen brightness is now 40% instead of the > previous 100%? Are you using a GUI? Nope, even the very first line of output from initramfs is dim, and if I then reboot and go into the BIOS settings, the screen intensity is at 40%. While it's rebooting, the Dell bios splash will start off bright and then suddenly dim down. With the patches reverted: [/sys/class/backlight/acpi_video0] grep . *bright* actual_brightness:95 brightness:95 max_brightness:95 And the weird part inside the kernel - on a kernel that has the problem, /sys/class/backlight is *empty* - only '.' and '..' entries. No, I don't understand why the acpi_video0 entry isn't created when that commit is in place. --==_Exmh_1463727728_2055P Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 Comment: Exmh version 2.5 07/13/2001 iQIVAwUBVz62cAdmEQWDXROgAQJ+zg/+J0K0GG4Ke6RZwUPYEMtNQwjhd17tk98j xWNwDEec9LanYpPOL3Cxgw0NnrfONFv6XGLoOSQL2V9Z/ZoKnGv7gcfyoesaChOT FyyzqUIQfPYeSQqB5jVkZM9Rn//g4TL/aL8Eej/CgTlZfOgEK2HO9ni3dXeMGhYZ CK37Xcf/Sz71sKcCTLIq788FKZXw49ahvWKOBPilSanUN3Yv6LgVkWujYEQnDaov FsWHL16lZd4f/dNv9PAiH8A7IcKChQS1PuRaRwjwgbEoeZg/DqOGX4z0+BDkMBMR EgK7yESwwa3oHujrPMZYy7zm+TtivRsbEB+XdN2UIyFekv8HcQdAm0Hv/kDdWTRV 5LQqvRnWMTvm28RJuzYaO1on+vpIGuwErsV9YHc56TFK1UArDym8h+QwfF/OkPdJ JV4hYD5MdggfZVxy3k24nUjwgBXjuJ/fmdCc/u4O5quYU4YDDvrO4l25/uiRKeFm cTLka5dBsGtblSd/tSVgG4gsReL451dFDGI2MFHLc3Lm2MhyMQ0V0HgOpxFrP09O jdq4aRjx0UHjwuQs0DT8zWKee5qDqSGvf/pptmTWArd9Gy3vWfzNu6HDFPHw92dh zQwH17oWkryeHeWMvzoFbNxwhxLmXFSScoJ7HoKQhn9jrVFBHXf2qQHFxH13oi2G AYiMHE/jVDs= =0Ut+ -----END PGP SIGNATURE----- --==_Exmh_1463727728_2055P--