linux-kernel - Re: [PATCH] drm/nouveau/kms/nv50-: fix build failure with CONFIG

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Message-ID: <CAK8P3a0YiAgTLptmPbK6vczkMi7F=tzE-Ae8GPFnBtbvQnoF0Q@mail.gmail.com>
Date:   Fri, 23 Jul 2021 20:40:19 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Karol Herbst <kherbst@...hat.com>
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Ben Skeggs <bskeggs@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Lyude Paul <lyude@...hat.com>,
        Arnd Bergmann <arnd@...db.de>,
        nouveau <nouveau@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Nikola Cornij <nikola.cornij@....com>
Subject: Re: [PATCH] drm/nouveau/kms/nv50-: fix build failure with CONFIG_BACKLIGHT=n

On Fri, Jul 23, 2021 at 6:34 PM Karol Herbst <kherbst@...hat.com> wrote:
> On Fri, Jul 23, 2021 at 6:31 PM Randy Dunlap <rdunlap@...radead.org> wrote:
> > On 7/23/21 8:15 AM, Karol Herbst wrote:
> > > On Fri, Jul 23, 2021 at 5:10 PM Randy Dunlap <rdunlap@...radead.org> wrote:
> > >
> > > what's actually the use case of compiling with
> > > CONFIG_DRM_NOUVEAU_BACKLIGHT=n anyway?
> >
> > Dunno. In this case it was just a randconfig. Still, it needs to be
> > handled in some way - such as the other suggestion in this thread.
> >
>
> sure, I was just curious if there was a specific use case or just
> something random as you mentioned.

I think this is purely done because of tradition. A long time ago, we had
tiny framebuffer drivers and most PCs did not have backlights, so it
made sense to leave this optional.

This was probably just always carried over.

         Arnd