Date: Tue, 17 Feb 2015 01:03:27 +0100 From: Michael Gmelin <freebsd@grem.de> To: Ian FREISLICH <ianf@capeaugusta.com> Cc: Adrian Chadd <adrian@freebsd.org>, freebsd-current <freebsd-current@freebsd.org> Subject: Re: r277959 breaks X display on IvyBridge mobile GT2 IG Message-ID: <20150217010327.1119a57f@bsd64.grem.de> In-Reply-To: <CAJ-VmonpvgZe5CwX5znfC-8kPzPGaXa7OEYfFvn5pKYg4VON9Q@mail.gmail.com> References: <E1YNUKo-000Hfw-9H@clue.co.za> <CAJ-VmonpvgZe5CwX5znfC-8kPzPGaXa7OEYfFvn5pKYg4VON9Q@mail.gmail.com>
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On Mon, 16 Feb 2015 15:45:46 -0800 Adrian Chadd <adrian@freebsd.org> wrote: > On 16 February 2015 at 14:40, Ian FREISLICH <ianf@capeaugusta.com> > wrote: > > Ian FREISLICH wrote: > >> Adrian Chadd wrote: > >> > Hi, > >> > > >> > >> > There's a "invert backlight" option in i915, try setting it to 1? > >> > >> This is pretty much all I could find (unless I was looking in the > >> wrong place). It makes no difference. The backlight appears to > >> be disabled. > > > > Adrian, do you have any idea how to fix the backlight for my laptop? > > I ended up reversing out your change r277959 in my local copy to > > make the backlight work again here. > > Hi, > > I don't, no. I haven't dug further into the i915 backlight control > code because, well, a lot of changed in that update. The backlight > code was in a lot of flux during the period of time kib chose to fast > forward, so it's not unsurprising that it broke for some. > > I think for now we'll need a quirk that can be added for each laptop > we find with that particular behaviour. The real solution is to > continue sliding i915 forward in time. > In the meantime this workaround might be useful (not sure if it works while the driver is loaded): https://github.com/grembo/intel_backlight_fbsd -- Michael Gmelin
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