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SubjectRe: [PATCH] platform/x86: dell-laptop: fix phantom kbd backlight on Inspiron 10xx
On Wednesday 18 September 2019 17:29:15 Pacien TRAN-GIRARD wrote:
> Quoting Pali Rohár (2019-09-12 09:33:58)
> > 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?
>
> Yes, the issue has been reported to Dell's technical support, which didn't
> provide a satisfying answer.

There were already some firmware problems with keyboard backlight and
Mario posted this comment about Linux support:
https://github.com/dell/libsmbios/issues/48#issuecomment-391328501

Can you try to use libsmbios tools and if they do not work too, report
problem also there?

> I'm not familiar with Dell's policy, but I doubt that they would issue a
> BIOS update for discontinued models from 2010.

We need to wait what Mario wrote about this particular problem.

> >
> > > Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=107651
> > > Signed-off-by: Pacien TRAN-GIRARD <pacien.trangirard@pacien.net>
> >
> > --
> > Pali Rohr
> > pali.rohar@gmail.com
>
> --
> Pacien TRAN-GIRARD <pacien.trangirard@pacien.net>

--
Pali Rohár
pali.rohar@gmail.com
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