在我的工作场所,我有一台Lenovo T14笔记本电脑 (1),通过 USB-C 连接到一台 1080p 显示器 (2),它用作扩展坞 - 具体来说,它通过 DisplayPort 输出连接到另一台显示器(在显示器中设置为“ DP 输出多流 = 扩展")。
这可行,但额外的显示器限制为 1920×1080。当我将它连接到 2k(2560×1440) 显示器 (HP Z27) 时,我只能将其设置为 1920×1080,然后显示器看起来很糟糕,因为它不是它的原始分辨率。
问题:这是笔记本电脑本身的限制吗?还是显示器的?我能做些什么来让笔记本电脑正确支持这些外接显示器吗?
我尝试了什么:
- 禁用笔记本电脑的内置 1920×1080 显示器 - 结果相同
- 使用 USB-C 将笔记本电脑直接连接到 2k(2560×1440) 显示器 - 效果很好。还测试了 4k(3840×2160,HP Z32)。
- 安装显示器驱动程序 - 结果相同
- 更新 2k 显示器的最新固件(1.0.0.18 Rev.A,在显示器上显示为 LIM293)- 结果相同
- MonitorInfoView正确显示最大分辨率 2560×1440。
(1) Lenovo T14 Gen1 20S1S3VT1N,配备i5-10310U CPU和Intel UHD Graphics(最新驱动31.0.101.2114),内置1920×1080显示屏。
(2) 飞利浦 243B1,1920×1080。它通过 USB-C 连接,然后:
- 在显示器上显示 DisplayPort-over-USBC 的输出。请注意,它不包括像 DisplayLink 这样的独立 GPU。
- 通过DisplayPort 1.2 菊花链将 DisplayPort 输出到附加显示器
- 具有 USB 音频、USB 以太网和一些额外的 USB 端口
额外研究
我使用USB Device Tree Viewer记录了 USB 设置
场景 1 - 第二个显示器限制为 1920×1080
Lenovo T14 gen1 (Intel UHD Graphics)
Dock monitor: Philips 243B1_27 1920×1080, USB set to USB 3.2
Second monitor, connected to dock monitor using DisplayPort-Out: HP Z27n G2 2560×1440 <<<<< Limited to 1920×1080
|---Intel(R) USB 3.1 eXtensible Host Controller - 1.10 (Microsoft)
| +---USB Root Hub (USB 3.0)
\---Intel(R) USB 3.1 eXtensible Host Controller - 1.10 (Microsoft)
\---USB Root Hub (USB 3.0)
|HS-[2-1]
|---[2-2]: Generic USB 2.1 Hub
| |---[2-2-1]: Generic USB 2.1 Hub
| | |LS-[2-2-1-1]: Avago Pte USB Optical Mouse <<<<< Monitor's USB ports, with some devices connected
| | |LS-[2-2-1-2]: Lenovo Traditional USB Keyboard
| | |HS-[2-2-1-3]
| | |HS-[2-2-1-4]
| | \HS-[2-2-1-5]
| |HS-[2-2-2]
| \HS-[2-2-3]
|FS-[2-3]: MOSART Semi 2.4G INPUT DEVICE - Keyboard, Mouse, 2× HID
(...)
|SS-[2-13]
|---[2-14]: Generic SuperSpeed USB 3.2 Hub
| +---[2-14-1]: Generic SuperSpeed USB 3.2 Hub
| \SS-[2-14-2]: Realtek USB GbE Family Controller - Net <<<<< Monitor's network controller - on USB3
(...)
场景 2:显示器切换到 USB2,第二台显示器以全分辨率运行
Lenovo T14 gen1 (Intel UHD Graphics)
Dock monitor: Philips 243B1_27 1920×1080, USB set to USB 2.0
Second monitor, connected to dock monitor using DisplayPort-Out: HP Z27n G2 2560×1440 <<<< Running at full res
|---Intel(R) USB 3.1 eXtensible Host Controller - 1.10 (Microsoft)
| +---USB Root Hub (USB 3.0)
\---Intel(R) USB 3.1 eXtensible Host Controller - 1.10 (Microsoft)
\---USB Root Hub (USB 3.0)
|HS-[2-1]
|---[2-2]: Generic USB 2.1 Hub
| |---[2-2-1]: Generic USB 2.1 Hub
| | |LS-[2-2-1-1]: Avago Pte USB Optical Mouse <<<<< Monitor's USB ports, with some devices connected
| | |LS-[2-2-1-2]: Lenovo Traditional USB Keyboard
| | |HS-[2-2-1-3]
| | |HS-[2-2-1-4]
| | \HS-[2-2-1-5]
| |HS-[2-2-2]: Realtek USB GbE Family Controller - Net <<<<< Monitor's network controller - on USB2
| \HS-[2-2-3]
|FS-[2-3]: MOSART Semi 2.4G INPUT DEVICE - Keyboard, Mouse, 2× HID
(...)
场景 3:更强大的笔记本电脑,第二台显示器以全分辨率运行
Laptop: Lenovo T14 Gen2i (Intel Iris XE)
Dock monitor: Philips 243B1_27, USB set to USB 3.2
Second monitor, connected to dock monitor using DisplayPort-Out: HP Z27n G2 2560×1440 <<<< Running at full res
|---Intel(R) USB 3.10 eXtensible Host Controller - 1.20 (Microsoft)
| \---USB Root Hub (USB 3.0)
(...)
| |HS-[1-5]
| |---[1-6]: Generic USB 2.1 Hub
| | |HS-[1-6-1]
| | |HS-[1-6-2]
| | |LS-[1-6-3]: PixArt Lenovo USB Optical Mouse <<<<< Monitor's USB ports, with some devices connected
| | |LS-[1-6-4]: Dell USB Keyboard
| | |HS-[1-6-5]
(...)
\---Intel(R) USB 3.10 eXtensible Host Controller - 1.20 (Microsoft)
\---USB Root Hub (USB 3.0)
|HS-[2-1]
|SS-[2-2]
|SS-[2-3]
|---[2-4]: Generic SuperSpeed USB 3.2 Hub
| |SS-[2-4-1]
| |SS-[2-4-2]
| |SS-[2-4-3]
| |SS-[2-4-4]
| \SS-[2-4-5]: Realtek USB GbE Family Controller - Net <<<<< Monitor's network controller - on USB3
\SS-[2-5]