Date: Sun, 1 Feb 2015 10:41:25 +0100 From: Lars Engels <lars.engels@0x20.net> To: Andrew Wilcox <AWilcox@Wilcox-Tech.com> Cc: 'freebsd-current' <freebsd-current@freebsd.org> Subject: Re: drm2 regression: backlight adjustment on ivybridge no longer works Message-ID: <20150201094124.GO41565@e-new.0x20.net> In-Reply-To: <004001d03e02$62d7f040$2887d0c0$@Wilcox-Tech.com> References: <000e01d039fb$d5959930$80c0cb90$@Wilcox-Tech.com> <CACyC=qZeG8L%2BbZu=RacU_rdNVTFhyCFH2A%2BdNw71%2B09cZ20VgA@mail.gmail.com> <009501d03acb$4f380d70$eda82850$@Wilcox-Tech.com> <CAJ-Vmokph=BHH895uHxQh=dHPfb5_ik4MZrq8sOGrd0AtPzymQ@mail.gmail.com> <CAJ-Vmom3gLa_2EoviL0Ck2B36Bpa-3P58%2BUp5rsLFaH-NS4ExQ@mail.gmail.com> <CACyC=qZJZw0DNWO%2BUd_pq_4V4d4A6yMnDF%2BwVqPgt1mg1txJWg@mail.gmail.com> <54CA7949.6060202@shurik.kiev.ua> <CADGo8CVuDLVUD26Xfr1j=nEQ%2B5q4ByfYC8EK4XYTm=sNvab3pA@mail.gmail.com> <20150201091821.GN41565@e-new.0x20.net> <004001d03e02$62d7f040$2887d0c0$@Wilcox-Tech.com>
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--uX2tiToO0oGq+LKk Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sun, Feb 01, 2015 at 03:35:15AM -0600, Andrew Wilcox wrote: > Lars Engels sent: 01 February 2015 03:18: > > With acpi_video I get some interesting sysctl: > > hw.acpi.video.lcd0.levels: 100 100 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 > > 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 > > 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 > > 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 > > 88 89 90 91 92 93 94 95 96 97 98 99 100 > >=20 > > I guess it should not be 100 100 0 ... 100? >=20 > Actually, the "standard" internal ACPI brightness level struct (BRTN in t= he DSDT) is laid out as: >=20 > * "Full power" value (one byte, the value at which the brightness should = be set on AC by default) > * "Economy" value (one byte, the value at which the brightness should be = set on battery by default) > * Actual values (N bytes, up to Max but frequently not) >=20 > So, no, that value indeed sounds correct. On my laptop the value is: > 80 47 0 7 13 20 27 33 40 47 53 60 67 73 80 87 93 100 Thank you for the explanation. FWIW, here is the full output from sysctl hw.acpi.video.lcd0: hw.acpi.video.lcd0.active: 1 hw.acpi.video.lcd0.brightness: 11 hw.acpi.video.lcd0.fullpower: 100 hw.acpi.video.lcd0.economy: 100 hw.acpi.video.lcd0.levels: 100 100 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 hw.acpi.video.crt0.active: 1 hw.acpi.video.ext0.active: 1 hw.acpi.video.ext1.active: 1 hw.acpi.video.ext2.active: 1 hw.acpi.video.ext3.active: 1 hw.acpi.video.ext4.active: 1 hw.acpi.video.ext5.active: 1 >=20 > What revision of -CURRENT are you running? What is the outcome of > trying the patch posted Saturday morning (UTC) from Elizabeth Myers > (message ID <54CC5311.9070604@interlinked.me>)? >=20 I'm currently running r277858 and haven't tried the patch, yet. But will do now and report back. --uX2tiToO0oGq+LKk Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQF8BAEBCgBmBQJUzfTEXxSAAAAAAC4AKGlzc3Vlci1mcHJAbm90YXRpb25zLm9w ZW5wZ3AuZmlmdGhob3JzZW1hbi5uZXQ4RjQwMDE3RTRERjUzMTI1N0FGRTUxNDlF NTRDQjM3RDNBMDg5RDZEAAoJEOVMs306CJ1tTfIH/jyGKz9vMp/r7CwYPY7lIdMg fbIqONFl/LlKt6oiriVEgljSwKP0hi39hmtjgQGd+zWWEKfGVPyNlUshpDUxJvos GjrwGH913UB3PLFuGG/h6rhcr8Qkt+e73uYS5Rav/N6WIQY6tsQ7DSS67z0hBEKI s0eMV3JdGpztk0mf6+MkiGJiOdfKXxK2A5BK/7hbzK+C/LvYux9Z+ubFElQL/rv8 Y7wRhXv2ty5vh7Ho37+JoC4aZ7uZxZZlGhbxl4U+9VdP2k6OaWVBqGqVkahe97l4 ld98X1GbrksfUGAuJkC95C5zkvAbeIK4X351YtLzBzJolJZqOhO3c5ukF+o4juU= =DgRi -----END PGP SIGNATURE----- --uX2tiToO0oGq+LKk--
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