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From: Aaron Lu <aaron.lu@intel.com>
To: Lewis Toohey <lewis@toohey.co.uk>
Cc: linux-acpi@vger.kernel.org, Hans de Goede <hdegoede@redhat.com>
Subject: Re: Bug Report - [Acer Aspire V5-122P] Unable to adjust screen brightness
Date: Fri, 23 May 2014 09:34:47 +0800	[thread overview]
Message-ID: <537EA5B7.9050509@intel.com> (raw)
In-Reply-To: <CADNzsyO7gzhtng0WmKA9DGZAreEGVsbAJ+KGdgJu+9zr_LyR8g@mail.gmail.com>

On 05/21/2014 09:02 PM, Lewis Toohey wrote:
> Hi Aaron
> 
> I followed your instructions and can report some limited success. I
> have two interfaces listed in /sys/class/backlight namely:
>   acpi_video0  radeon_bl0
> 
> max_brightness for acpi_video0 is 11. Echo-ing new values to
> brightness appears to have no effect.
> 
> max_brightness for radeon_bl0 is 255. Echo-ing new values to
> brightness does adjust the screen brightness as you would expect.
> 
> Results are the same on both battery and powered.
> 
> I hope that is useful.

I think Hans' patchset should solve your problem, can you please give it
a try? You will need to pass the video.use_native_backlight=1 to kernel
cmdline when testing, thanks.

[PATCH resend 0/4] Make video.use_native_backlight=1 work properly with nouveau
http://www.spinics.net/lists/dri-devel/msg59941.html

-Aaron

  reply	other threads:[~2014-05-23  1:35 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-05-20 18:32 Bug Report - [Acer Aspire V5-122P] Unable to adjust screen brightness Lewis Toohey
2014-05-21  1:21 ` Aaron Lu
2014-05-21  7:05   ` Lewis Toohey
2014-05-21 12:36     ` Aaron Lu
2014-05-21 13:02       ` Lewis Toohey
2014-05-23  1:34         ` Aaron Lu [this message]
2014-05-23 12:07           ` Lewis Toohey
2014-05-23 12:50             ` Hans de Goede
2014-05-23 13:38               ` Lewis Toohey
2014-05-24 11:23               ` Lewis Toohey
2014-05-25 20:42               ` Lewis Toohey
2014-05-26  5:48                 ` Aaron Lu
2014-05-26 12:18                   ` Lewis Toohey
2014-05-26 19:09                     ` Lewis Toohey
2014-05-27  1:12                       ` Aaron Lu
2014-05-30 13:12                         ` Lewis Toohey
2014-06-03  1:22                           ` Aaron Lu
2014-06-09  7:38                             ` Lewis Toohey
2014-06-10  5:33                               ` Sluggish performance after resume//Re: " Aaron Lu
2014-06-10 16:58                                 ` Ben Widawsky
2014-06-10 19:59                                   ` Lewis Toohey
2014-06-10 22:54                                     ` Ben Widawsky
2014-06-11  7:03                                       ` Aaron Lu
2014-06-11  7:41                                         ` Lewis Toohey

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