Re: [ibm-acpi-devel] [PATCH] thinkpad_acpi: don't yell on unsupported brightness interfaces

[Eric Curtin]

On 8 January 2016 at 11:55, David Herrmann  wrote:
> Hi
>
> On Thu, Jan 7, 2016 at 2:03 AM, Eric Curtin  wrote:
>> Also another query, could be a mini-side project for me as I'm a
>> beginner kernel dev when I have some spare time. Could we change the
>> minimum brightness value not to be off? 0 does not have to mean
>> backlight off from reading various things around the web:
>>
>> http://www.x.org/wiki/Events/XDC2014/XDC2014GoedeBacklight/backlight.pdf
>>
>> And to be honest having the ability to completely turn off the
>> backlight is a useless function and is probably unintended as discussed
>> in the github thread above also. You would need night vision googles to
>> read the screen in this state! I'm pretty sure the Windows driver does
>> not completely turn off the screen on minimum brightness either, no
>> need to have different functionality on different platforms especially
>> when this functionality isn't very useful.
>
> Whether '0' means 'off' or 'lowest brightness level' has been
> discussed several times. Sadly, we cannot change semantics without
> breaking user-space, so you better work around it. There have been
> several proposals to fix it, but I guess no-one cared so far.
>
> Anyway, both features (turning backlight off *and* lowest backlight
> level) _are_ used actively by user-space. Hence, both should be
> supported.
>
> Thanks
> David

As regards the "Unsupported brightness interface" log message will I
add 101 to the switch statement so it doesn't get reported on my device
or just remove it? This seems to be reporting many false positives (or
negatives whatever way you want to look at it) on different machines so
can I remove this logging?

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Re: [ibm-acpi-devel] [PATCH] thinkpad_acpi: don't yell on unsupported brightness interfaces

[David Herrmann]

Hi

On Thu, Jan 7, 2016 at 2:03 AM, Eric Curtin  wrote:
> Also another query, could be a mini-side project for me as I'm a
> beginner kernel dev when I have some spare time. Could we change the
> minimum brightness value not to be off? 0 does not have to mean
> backlight off from reading various things around the web:
>
> http://www.x.org/wiki/Events/XDC2014/XDC2014GoedeBacklight/backlight.pdf
>
> And to be honest having the ability to completely turn off the
> backlight is a useless function and is probably unintended as discussed
> in the github thread above also. You would need night vision googles to
> read the screen in this state! I'm pretty sure the Windows driver does
> not completely turn off the screen on minimum brightness either, no
> need to have different functionality on different platforms especially
> when this functionality isn't very useful.

Whether '0' means 'off' or 'lowest brightness level' has been
discussed several times. Sadly, we cannot change semantics without
breaking user-space, so you better work around it. There have been
several proposals to fix it, but I guess no-one cared so far.

Anyway, both features (turning backlight off *and* lowest backlight
level) _are_ used actively by user-space. Hence, both should be
supported.

Thanks
David

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Re: [ibm-acpi-devel] [PATCH] thinkpad_acpi: don't yell on unsupported brightness interfaces

[Henrique de Moraes Holschuh]

On Fri, Jan 8, 2016, at 15:26, Eric Curtin wrote:
> As regards the "Unsupported brightness interface" log message will I
> add 101 to the switch statement so it doesn't get reported on my device
> or just remove it? This seems to be reporting many false positives (or
> negatives whatever way you want to look at it) on different machines so
> can I remove this logging?

Either remove the message, or leave it at debug level.  Do not add 101
to the switch case, please.

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh

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Re: [ibm-acpi-devel] [PATCH] thinkpad_acpi: don't yell on unsupported brightness interfaces

[Henrique de Moraes Holschuh]

On Wed, Oct 21, 2015, at 08:46, David Herrmann wrote:
> The thinkpad_acpi driver currently emits error messages on unsupported
> brightness interfaces, giving the impression that someone will implement
> those. However, this error is spit out on nearly every thinkpad in
> production since 2 years now. Furthermore, the backlight interfaces on
> those devices are supported by the i915 driver just fine.
> 
> Downgrade the error message to a normal pr_info() and stop telling people
> to report it to IBM.

IBM?  Those reports go directly to me.

> Signed-off-by: David Herrmann 

Acked-by: Henrique de Moraes Holschuh 

> ---
>  drivers/platform/x86/thinkpad_acpi.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/platform/x86/thinkpad_acpi.c
> b/drivers/platform/x86/thinkpad_acpi.c
> index 131dd74..0bed473 100644
> --- a/drivers/platform/x86/thinkpad_acpi.c
> +++ b/drivers/platform/x86/thinkpad_acpi.c
> @@ -6459,8 +6459,7 @@ static void __init
> tpacpi_detect_brightness_capabilities(void)
>   pr_info("detected a 8-level brightness capable ThinkPad\n");
>   break;
>   default:
> -   pr_err("Unsupported brightness interface, "
> -  "please contact %s\n", TPACPI_MAIL);
> +   pr_info("Unsupported brightness interface\n");
>   tp_features.bright_unkfw = 1;
>   bright_maxlvl = b - 1;
>   }
> -- 
> 2.6.1
> 
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-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh

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Re: [ibm-acpi-devel] [PATCH] thinkpad_acpi: don't yell on unsupported brightness interfaces

[Darren Hart]

On Wed, Oct 21, 2015 at 12:33:52PM -0200, Henrique de Moraes Holschuh wrote:
> On Wed, Oct 21, 2015, at 08:46, David Herrmann wrote:
> > The thinkpad_acpi driver currently emits error messages on unsupported
> > brightness interfaces, giving the impression that someone will implement
> > those. However, this error is spit out on nearly every thinkpad in
> > production since 2 years now. Furthermore, the backlight interfaces on
> > those devices are supported by the i915 driver just fine.
> > 
> > Downgrade the error message to a normal pr_info() and stop telling people
> > to report it to IBM.
> 
> IBM?  Those reports go directly to me.
> 
> > Signed-off-by: David Herrmann 
> 
> Acked-by: Henrique de Moraes Holschuh 

Thanks, Queued.

-- 
Darren Hart
Intel Open Source Technology Center

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