Date: Wed, 28 Jan 2015 06:42:20 +0100 From: "Ranjan1018 ." <214748mv@gmail.com> To: Andrew Wilcox <AWilcox@wilcox-tech.com> Cc: Adrian Chadd <adrian@freebsd.org>, freebsd-current <freebsd-current@freebsd.org>, Konstantin Belousov <kib@freebsd.org> Subject: Re: drm2 regression: backlight adjustment on ivybridge no longer works Message-ID: <CACyC=qZeG8L%2BbZu=RacU_rdNVTFhyCFH2A%2BdNw71%2B09cZ20VgA@mail.gmail.com> In-Reply-To: <000e01d039fb$d5959930$80c0cb90$@Wilcox-Tech.com> References: <CAJ-VmomfBrBN6HVBq5FoRf1nRqvrhiDOw6RHjfs13j-9cqi1vg@mail.gmail.com> <CACyC=qYMT3VFx4GxypJ6F61pKSaxE0JKBK%2BudDMPSh4_ASAi6w@mail.gmail.com> <000e01d039fb$d5959930$80c0cb90$@Wilcox-Tech.com>
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2015-01-27 7:38 GMT+01:00 Andrew Wilcox <AWilcox@wilcox-tech.com>: > Ranjan1018 . sent: 26 January 2015 06:19: > > 2015-01-24 23:25 GMT+01:00 Adrian Chadd <adrian@freebsd.org>: > > > The backlight adjustment doesn't work on my ivybridge mobile laptop > > > (Lenovo X230) after the dri update. > > > > > I have the same issue on my Samsung Ativ 2 laptop. > > I have a Sandy Bridge laptop (Apple MacBook Pro 8,2) - HD 3000: > > vgapci0@pci0:0:2:0: class=0x030000 card=0x00db106b chip=0x01268086 > rev=0x09 hdr=0x00 > vendor = 'Intel Corporation' > device = '2nd Generation Core Processor Family Integrated Graphics > Controller' > class = display > subclass = VGA > > It is running: FreeBSD pwyll.foxkit.us 11.0-CURRENT #1 r277781M: Mon Jan > 26 18:41:15 CST 2015 root@pwyll.foxkit.us:/usr/obj/usr/src/sys/GENERIC > amd64 > > I have no issues using acpi_video's sysctls > (hw.acpi.video.lcd0.brightness) to adjust backlight, though it does not > have good granularity. The stepping is about 7, so it goes as > 13%..20%..27%..35%..etc. > > > > The "intel_backlight" program from intel-gpu-tools" also no longer > > > changes the backlight value. > > This program works fine for me on both an older kernel (r277523) and this > kernel (r277781), after applying some patches to allow the library to build > on FreeBSD. It also has better granularity (the stepping is 2-3). > > If there is anything I can do/run to aide in debugging why it works for me > but not others, let me know. > > Best, > Andrew > -- > Andrew Wilcox, C/C++/Python developer, kernel hacker > Blog: http://blog.foxkit.us/ WWW: http://foxkit.us/ > GitHub: https://github.com/awilfox > > Hi, my Samsung laptop has an Intel IvyBridge: vgapci0@pci0:0:2:0: class=0x030000 card=0xc708144d chip=0x01668086 rev=0x09 hdr=0x00 vendor = 'Intel Corporation' device = '3rd Gen Core processor Graphics Controller' class = display subclass = VGA The regression was introduced in r277487. The backlight adjustment works in FreeBSD 11.0-CURRENT r277395, r277486 but not in r277487, r277534 and r277639. Regards, Maurizio
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