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

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Date:   Thu, 12 Sep 2019 09:33:58 +0200
From:   Pali Rohár <pali.rohar@...il.com>
To:     Pacien TRAN-GIRARD <pacien.trangirard@...ien.net>
Cc:     Matthew Garrett <mjg59@...f.ucam.org>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] platform/x86: dell-laptop: fix phantom kbd backlight on
 Inspiron 10xx

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