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
next prev parent 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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