[prev in list] [next in list] [prev in thread] [next in thread] 

List:       opensuse
Subject:    Re: [opensuse] 13.1 - screen brightness stuck on high - unresponsive to fn keys - how to fix?
From:       "David C. Rankin" <drankinatty () suddenlinkmail ! com>
Date:       2014-07-16 9:27:29
Message-ID: 53C64581.5050406 () suddenlinkmail ! com
[Download RAW message or body]

On 07/16/2014 04:03 AM, David C. Rankin wrote:
> On 07/16/2014 03:49 AM, David C. Rankin wrote:
>> On 07/15/2014 05:28 AM, auxsvr@gmail.com wrote:
>>> On Monday 14 of July 2014 20:52:39 David C. Rankin wrote:
>>>> Testing acpi_listen:
>>>>
>>>>     $ acpi_listen
>>>> video/brightnessdown BRTDN 00000087 00000000 K
>>>> video/brightnessdown BRTDN 00000087 00000000 K
>>>> video/brightnessdown BRTDN 00000087 00000000 K
>>>> video/brightnessup BRTUP 00000086 00000000 K
>>>> video/brightnessup BRTUP 00000086 00000000 K
>>>> video/brightnessup BRTUP 00000086 00000000 K
>>>> video/brightnessup BRTUP 00000086 00000000 K
>>>> ^\Quit
>>>>
>>>>     Hmm. So the keystrokes are seen with acpid running, but it has no effect
>>>> on the brightness. So it looks like we need to create hooks or a config for
>>>> the events. But where? /etc/acpi/events?
>>>
>>> It depends on the desktop environment. On KDE 4.13.2, System
>>> Settings/Shortcuts and Gestures/Global Keyboard Shortcuts/KDE Daemon/Decrease
>>> or Increase Screen Brightness allows you to set the keys.
>>>
>>
>> Guys,
>>
>>    The problem here seems to be 13.1 itself. I ran acpi to get a status:
>>
>> # acpi -V
>> Battery 0: Unknown, 100%
>> Battery 0: design capacity 4000 mAh, last full capacity 4000 mAh = 100%
>> Adapter 0: on-line
>> Cooling 0: LCD 0 of 7
>> ^^^^^^^^^^^^^^^^^^^^^^
>> Cooling 1: Processor 0 of 3
>> Cooling 2: Processor 0 of 10
>>
>> (which knocked network manager offline and my wireless??)
>>
>> Here is the issue:
>>
>> Cooling 0: LCD 0 of 7
>>
>> WTF?? Cooling? then LCD 0 of 7??
>>
>> It looks like the LCD brightness function is FUBAR in 13.1 for my Toshiba.
>> Cooling??
>>
>> I don't even know what to make of this?
>>
>
> I also think 13.1 is looking at the wrong brightness. The *current brightness*
> is 7, not zero. Recall, I show 2 brightness interfaces under /sys/class/backlight:
>
>    # cat /sys/class/backlight/acpi_video0/brightness
> 7
>    # cat /sys/class/backlight/radeon_bl0/brightness
> 0
>
> So it looks like acpi reports the wrong one, and who knows what it is attempting
> to set. The values never change in either when I use the function keys.
>
>
>

I'm beginning to think this is a grub2 / kernel issue. I have found several 
issues recommending adding the following to the kernel command line:

   acpi_backlight=vendor

http://www.refreshit.info/2012/08/solved-brightness-increase-and-decrease.html

In 13.1, can I still just press 'e' and edit the grub2 boot line? I'll try. If 
there is another way, let me know. Thanks.

-- 
David C. Rankin, J.D.,P.E.
-- 
To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org
To contact the owner, e-mail: opensuse+owner@opensuse.org

[prev in list] [next in list] [prev in thread] [next in thread]