linux-kernel - Re: [PATCH v2 0/4] fujitsu

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Date:   Sat, 4 Mar 2017 12:17:23 +1030
From:   Jonathan Woithe <jwoithe@...t42.net>
To:     Micha?? K??pie?? <kernel@...pniu.pl>
Cc:     Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/4] fujitsu_init() cleanup

Hi Michael

On Wed, Mar 01, 2017 at 09:10:40AM +0100, Micha?? K??pie?? wrote:
> These patches should make fujitsu_init() a bit more palatable.  No
> changes are made to platform device code yet, for clarity these will be
> posted in a separate series after this one gets applied.

I have a preliminary report.  The backlight functionality remains functional
on an S7020 across all four of the patches in this series and with the
additional 2-patch cleanup series applied.

With regard to patch 2/4 you wrote:
> Jonathan, this *really* needs testing on relevant hardware.  After
> applying this patch, you should be able to turn LCD backlight on and off
> using /sys/class/backlight/fujitsu-laptop/bl_power.  Also, the value
> returned by that attribute upon read should be in sync with actual
> backlight state even right after loading the module (i.e. before writing
> anything to bl_power).  Please let me know if any of the above is not
> true and the module works correctly without this patch applied.

With patch 2/4 applied:

 * It is possible to read bl_power

 * It is possible to write a value to bl_power and read that value back

 * Writing values to bl_power does not appear to affect the LCD panel in 
   any way.  That is, the backlight remains unchanged regardless of the 
   value written.

 * Behaviour is the same both under X and from the terminal.

Backing out patch 2/4 but with all others still in place, resulted in no
change in behaviour.  So while bl_power had no effect with patch 2/4 in
place, it seems that patch 2/4 is *not* the cause of this.

I shall run some more bl_power tests and complete a review of the code later
this weekend.

Regards
  jonathan