linux-kernel - Re: [PATCH] platform/x86: dell-laptop: Add drm module soft dependency

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Date:   Wed, 7 Jun 2023 14:13:31 +0800
From:   AceLan Kao <acelan.kao@...onical.com>
To:     Matthew Garrett <mjg59@...f.ucam.org>
Cc:     Pali Rohár <pali@...nel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <markgross@...nel.org>,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        Kai-Heng Feng <kai.heng.feng@...onical.com>
Subject: Re: [PATCH] platform/x86: dell-laptop: Add drm module soft dependency

Matthew Garrett <mjg59@...f.ucam.org> 於 2023年6月7日 週三 下午1:27寫道：
>
> On Wed, Jun 07, 2023 at 01:19:40PM +0800, AceLan Kao wrote:
> > Gfx drivers(i915/amdgpu/nvidia) depend on the drm driver, so delaying
> > the loading of dell_laptop after drm can ease the issue the most.
> > Right, it's still possible to encounter the issue, unfortunately, we
> > do not have a better solution for it at the moment.
>
> We could unregister inappropriate backlight drivers when a more
> appropriate one is loaded, or the policy decision around which driver to
> use could be made in userland?
It's hard to decide which backlight driver is redundant, and it's kind of ugly
to unregister the backlight driver which is registered by other driver and maybe
problematic.

I'm not familiar with userland, but I think we should handle this
issue within the
kernel and aim to register only one functional backlight driver.