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Display brightness control.; 2 minutes to read; Contributors. In this article. Starting with Windows 8, a standardized solution has been added to allow keyboards (external or embedded on laptops), to control a laptop’s or tablet’s screen brightness through HID.
Ivan Ivanov
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- Apr 28, 2009
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Hi All
I bought a really cheap configuration for a relative of mine and encountered the following problem:
Despite my best efforts I cannot adjust brightness/contrast or any other parameter for that mater. (like H/V position H/V size.. etc.)
Now, I'd like to distinguish myself from all those who get puzzled that the monitor doesn't have any buttons for such adjustments, don't read the manual to learn that there is an application dedicated for that job, and just don't know what to do. Those kinds of issues were virtually all I encountered while googling for a solution.
Here's what I did so far.
- I installed fresh Windows 7 and fully updated it.
- Installed all the latest drivers for all the hardware.
- Installed the 'i-Menu' application which manages all the adjustments and and info about the monitor.
- At first the app couldn't even detect the monitor, reporting: 'No PnP monitor detected' but after I installed the driver form the monitor's disc the app started detecting the monitor correctly.
When I launch it the app reprts 'Detected LCD PnP monitor', and after loading is done it displays all the monitor's stats. (Model, native resolution etc.) But all the sliders are still inactive. I mean they slide but nothing happens as a result of that.
- I tested the monitor on my laptop (Installed the driver and i-Menu) and all worked fine. So I managed to reduce the brightness so it doesn't 'pop' my eyes.
Initially I couldn't adjust the brightness through Intel's integrated GC but after some windows updates it started working. but it's not convenient at all and saturates the picture very quickly.
So my theory is that the mobo is so cheap it lacks some connections/hardware-functionality that the monitor's software needs in order to work. Well that doesn't explain why the monitor is detected correctly?!
Could be a software issue; I tried to install the latest i-Menu from the manufacturer's web site but the archive was broken.. I looked for other places to download it from but couldn't find any.
There is no better driver than that on the disc.
Both monitor and mobo have only D-Sub interface to connect through.
OK that's all, hope someone can help, Thanks in advance!
-->I bought a really cheap configuration for a relative of mine and encountered the following problem:
Despite my best efforts I cannot adjust brightness/contrast or any other parameter for that mater. (like H/V position H/V size.. etc.)
Now, I'd like to distinguish myself from all those who get puzzled that the monitor doesn't have any buttons for such adjustments, don't read the manual to learn that there is an application dedicated for that job, and just don't know what to do. Those kinds of issues were virtually all I encountered while googling for a solution.
Here's what I did so far.
- I installed fresh Windows 7 and fully updated it.
- Installed all the latest drivers for all the hardware.
- Installed the 'i-Menu' application which manages all the adjustments and and info about the monitor.
- At first the app couldn't even detect the monitor, reporting: 'No PnP monitor detected' but after I installed the driver form the monitor's disc the app started detecting the monitor correctly.
When I launch it the app reprts 'Detected LCD PnP monitor', and after loading is done it displays all the monitor's stats. (Model, native resolution etc.) But all the sliders are still inactive. I mean they slide but nothing happens as a result of that.
- I tested the monitor on my laptop (Installed the driver and i-Menu) and all worked fine. So I managed to reduce the brightness so it doesn't 'pop' my eyes.
Initially I couldn't adjust the brightness through Intel's integrated GC but after some windows updates it started working. but it's not convenient at all and saturates the picture very quickly.
So my theory is that the mobo is so cheap it lacks some connections/hardware-functionality that the monitor's software needs in order to work. Well that doesn't explain why the monitor is detected correctly?!
Could be a software issue; I tried to install the latest i-Menu from the manufacturer's web site but the archive was broken.. I looked for other places to download it from but couldn't find any.
There is no better driver than that on the disc.
Both monitor and mobo have only D-Sub interface to connect through.
OK that's all, hope someone can help, Thanks in advance!
Starting with Windows 8, a standardized solution has been added to allow keyboards (external or embedded on laptops), to control a laptop’s or tablet’s screen brightness through HID.
This solution is described in the HID committee's recently approved HID Review Request 41. Synthogy ivory ii torrent.
Architecture and overview
Windows 8 provides support for screen brightness increase/decrease as part of the consumer controls top level collection. Windows 8 supports the HID usages listed in the following table:
Usage ID | Usage Name | Usage Type |
---|---|---|
0x006F | Brightness Increment | Re-trigger Control (RTC) |
0x0070 | Brightness Decrement | Re-trigger Control (RTC) |
Note These HID usages operate only on mobile systems (battery powered) and require Windows 8.
Sample report descriptor
The following section provides sample report descriptors that PC Manufacturers must leverage. Please note that if the Top Level Collection is part of a report descriptor that already has another Top Level Collection, a Report ID MUST be included (not shown in samples below).
Important Notes
- When a user presses a key, an input report is generated to identify the key. When the key is released an input report with usage value=0 is issued.
- Only one usage is active and sent at a time. Consumer controls do not allow multiple buttons to be pressed simultaneously. When a new usage is sent, it is assumed that the usage for the previous key is released.
- Brightness up/down are retriggering keys and their rate of repeat is handled by Windows. Hardware should not keep resending the usage when these keys are kept depressed by user. Hardware should only send an input report when button is pressed down and another when the key is released.
Troubleshooting common errors
Tip #1: Brightness increment/decrement HID usages only operate only on Mobile systems (battery powered) and require Windows 8.
Tip #2: If the system is attached to an external monitor, the brightness increment/decrement will not function as legacy monitor transports do not support the ability to channel HID messages to them / from them.