linux-kernel - Re: [PATCH] platform/x86: dell-laptop: fix phantom kbd backlight on Inspiron 10xx

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Date:   Thu, 12 Sep 2019 16:30:06 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Pali Rohár <pali.rohar@...il.com>,
        Mario Limonciello <mario.limonciello@...l.com>
Cc:     Pacien TRAN-GIRARD <pacien.trangirard@...ien.net>,
        Matthew Garrett <mjg59@...f.ucam.org>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] platform/x86: dell-laptop: fix phantom kbd backlight on
 Inspiron 10xx

+Cc: Mario

On Thu, Sep 12, 2019 at 10:34 AM Pali Rohár <pali.rohar@...il.com> wrote:
>
> On Thursday 12 September 2019 01:14:48 Pacien TRAN-GIRARD wrote:
> > This patch registers a quirk disabling keyboard backlight support
> > for the Dell Inspiron 1012 and 1018.
> >
> > Those models wrongly report supporting the KBD_LED_OFF_TOKEN and
> > KBD_LED_ON_TOKEN SMBIOS tokens, exposing keyboard brightness controls
> > through sysfs which freeze the system when used.
> >
> > The associated SMBIOS calls never return and cause the system to
> > hang, notably at boot when systemd-backlight tries to restore
> > previous brightness settings.
>
> Hi! This sounds like a firmware bug. Have you already reported it to Dell?
>
> > Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=107651
> > Signed-off-by: Pacien TRAN-GIRARD <pacien.trangirard@...ien.net>
>
> --
> Pali Rohár
> pali.rohar@...il.com



-- 
With Best Regards,
Andy Shevchenko