Date: Sun, 1 Feb 2015 03:35:15 -0600 From: "Andrew Wilcox" <AWilcox@Wilcox-Tech.com> To: "'Lars Engels'" <lars.engels@0x20.net> Cc: 'freebsd-current' <freebsd-current@freebsd.org> Subject: RE: drm2 regression: backlight adjustment on ivybridge no longer works Message-ID: <004001d03e02$62d7f040$2887d0c0$@Wilcox-Tech.com> In-Reply-To: <20150201091821.GN41565@e-new.0x20.net> References: <CAJ-VmomfBrBN6HVBq5FoRf1nRqvrhiDOw6RHjfs13j-9cqi1vg@mail.gmail.com> <CACyC=qYMT3VFx4GxypJ6F61pKSaxE0JKBK%2BudDMPSh4_ASAi6w@mail.gmail.com> <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>
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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? Actually, the "standard" internal ACPI brightness level struct (BRTN in = the DSDT) is laid out as: * "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) 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 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>)? Andrew -- Andrew Wilcox, C/C++/Python developer, kernel hacker Blog: http://blog.foxkit.us/ WWW: http://foxkit.us/ GitHub: https://github.com/awilfox
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