最近将较旧的联想(Lenovo)笔记本电脑升级到Windows 10后，我遇到了一个非常烦人的问题。无论出于何种原因，调节亮度的能力停止工作。按下键盘上的亮度键会显示亮度级别正在上升或下降，但屏幕上实际上没有任何变化！这是我见过的最奇怪的事情。
我首先想到的可能是硬件问题，Windows 10无法正确识别按键。我决定尝试更改操作系统本身的亮度级别。我打开操作中心(Action Center)并单击扩展 (Expand )，然后尝试在那里调整亮度，但还是没有任何反应！现在我真的很困惑。
我还尝试转到电源选项(Power Options)并更改那里的亮度，但它再次对实际显示没有任何影响。我脑海中闪现的第二个想法是这是驱动程序的问题。我去了联想(Lenovo)网站并下载了我能找到的最新驱动程序。我希望这能解决问题，但它没有！
此时，我认为可能是最新的驱动程序尚未正确支持Windows 8.1，因此我需要尝试使用标准或基本的Windows图形驱动程序。最后，这就是解决问题的原因。现在我只需要等到联想为我的旧(Lenovo)联想(Lenovo)笔记本电脑发布更新的驱动程序。以下是临时解决问题的方法。
首先，打开控制面板(Control Panel)并点击设备管理器(Device Manager)：
接下来，展开显示适配器(Display Adapters)，然后右键单击系统上安装的显卡并选择属性(Properties)。可能是Intel HD Graphics等。这取决于您安装的显卡类型，但实际上最多只能列出一两个。
现在继续并单击驱动程序(Driver)选项卡，然后单击更新驱动程序(Update driver)按钮。
接下来，您将有两个选择。您想选择浏览我的计算机以获取驱动程序软件(Browse my computer for driver software)选项。
我们快完成了，继续前进！现在继续并单击底部的让我从计算机上的设备驱动程序列表中选择按钮。( Let me pick from a list of device drivers on my computer)
现在您要为显卡选择不同的驱动程序。您可能会尝试并选择不同的，看看哪个适合您，但最安全的始终是Microsoft Basic Display Adapter。
根据您的系统，您可能会在框中看到多个驱动程序，甚至多次列出相同的驱动程序。您可以尝试其他一些，但如果没有任何效果，请使用基本驱动程序。不幸的是，如果您使用基本驱动程序，您将无法以最高分辨率或帧速率运行操作系统，但至少您可以调整亮度。
就我而言，我只是切换到基本驱动程序，将亮度调整到我需要的位置，然后切换回原始制造商驱动程序。亮度级别保持在我设置的级别，这很好。然后每隔一段时间检查一下是否有新的驱动程序，并在可用时安装它。
然而，有时老司机工作得更好。我在联想 IdeaPad P400(Lenovo IdeaPad P400)上遇到了同样的问题，我必须安装旧版驱动程序才能使屏幕更亮。否则，即使亮度一直调高，屏幕也总是很暗。
如果您仍然无法调整 Windows 10 机器的亮度，请在此处发表评论并让我们知道详细信息。享受！
Fix Can’t Adjust Brightness after Upgrading to Windows 8.1/10
After upgrading an older Lenovo laptop to Windows 10 recently, I ran into a very annoying problem. For whatеver reason, the ability to adjuѕt the brightnеss stoppеd working. Presѕing the brightness keys on the keyboard would show that the brіghtness level was going up or down, but nothing aсtually chаnged on the sсreen! It was the weirdeѕt thing I had ever sеen.
The first thing I thought was maybe there was some hardware issue and Windows 10 was not recognizing the key press properly. I decided to try to change the brightness level in the OS itself. I opened Action Center and clicked on Expand and then tried to adjust the brightness there, but again nothing happened! Now I was really confused.
I also tried to go to Power Options and change the brightness there, but again it didn’t make any difference on the actual display. The second thought that popped into my head was that it was a driver issue. I went to the Lenovo website and downloaded the latest driver I could find for the machine. I was hoping that would fix the problem, but it didn’t!
At this point, I figured it could be that the latest driver doesn’t yet support Windows 8.1 properly and therefore I need to try out the standard or basic Windows graphics driver instead. In the end, this is what fixed the problem. Now I just have to wait till Lenovo releases an updated driver for my older Lenovo laptop. Here’s how to fix the issue temporarily.
First, open the Control Panel and click on Device Manager:
Next, expand Display Adapters and then right-click on the graphics card installed on your system and choose Properties. It could be something like Intel HD Graphics, etc. It’ll depend on what kind of graphics card you have installed, but there really should only be one or two listed max.
Now go ahead and click on the Driver tab and then click on the Update driver button.
Next you’ll have two options. You want to choose the Browse my computer for driver software option.
We’re almost done, so keep going! Now go ahead and click on the Let me pick from a list of device drivers on my computer button at the bottom.
Now you want to choose a different driver for the graphics card. You might have play around and pick a different ones and see which works for you, but the safest will always be Microsoft Basic Display Adapter.
Depending on your system, you may see several drivers listed in the box, even the same driver listed multiple times. You can try some of the other ones, but if nothing works, just use the basic driver. Unfortunately, you won’t be able to run the OS at the highest resolution or frame rate if you use the basic driver, but at least you can adjust the brightness.
In my case, I simply switched to the basic driver, adjusted the brightness to where I needed it and then switched back to the original manufacturer driver. The brightness level remained at the level I had set it, so that was good. Then just check every so often to see if there is a new driver and install that when it becomes available.
However, sometimes an older driver works better. I had the same issue on a Lenovo IdeaPad P400 and I had to install an older driver in order to make the screen brighter. Otherwise, the screen was always dim, even with the brightness turned all the way up.
If you’re still having trouble adjusting the brightness on your Windows 10 machine, post a comment here and let us know the details. Enjoy!
