怎么将1080p的屏在linux下显示720p

[fulinux]

硬件平台：imx6q

软件平台：linux-3.0.35， Qt5.4

大家好，

我们现在遇到一个棘手的问题，想请nxp的同事帮我看看。我们现在是基于imx6q的平台做Qt程序应用，我们的屏是1920x1080@60, 使用了两路lvds（split mode）, 我们用Qt5.4开放了一个小游戏，但是因为是一个1080p的屏所以帧率很低，很难满足要求。我们讨论将分辨率降下来用720p的分辨率显示，这个方案可以吗？如果可以有没有是吗文档可以参考一下，需要改哪里呢？我是一个新手，希望有个例子可以参考。

期待你们的回复！

谢谢！

fulinux.

[joanxie]

one can set uboot paramter to get 720p, for detailed information, I send uboot document and linux release note (table 11)to you for reference.

[fulinux]

Hi joan,

   Are you still here, can you give me some advice about how to change resolution in linux of running(linux运行着的时候)?

[joanxie]

my understanding is that you want to support dual 1080p display, and video resolution is 720p,right?

if yes, they are belong to different hardware, imx6 IPU couldn't support dual 1080p@60 display,  but vpu can support 720p@30 video.

[fulinux]

Hi joan,

    我们定制的开发板已经可以支持1080p屏，是用了双路lvds。问题是我们运行Qt的游戏程序时，游戏不流畅，帧率上不去，这个如何解决呢？ 我的想法是进入游戏是能不能把分辨率降到720p?退出游戏的时候又恢复原来的1080p的显示？不知道你有没有明白我的意思？

智能钢琴 克洛斯威智能钢琴 

这个是我们的产品，是基于你们的平台，linux+Qt开发的，希望你们能提供帮助。

[joanxie]

do you use QtWayland to run the application instead of using X11 or EGLFS, right?  if yes, maybe you can refer to the link as below:

https://community.nxp.com/thread/333193 

[fulinux]

Hi Joan,

  I have build a wayland rootfs, and copy a example of qtwayland to my board, it has some problem as following:

 ./qml-compositor
This application failed to start because it could not find or load the Qt platform plugin "xcb".

Available platform plugins are: eglfs, minimal, minimalegl, offscreen, wayland-egl, wayland.

Reinstalling the application may fix this problem.
Aborted

what's wrong? what should i do? (weston runs well).

[fulinux]

Hi joan,

   but i just want to set 720p when i luanched a game,  and resume to 1080p when i exited a game. it doesn't always 1080p or 720p.

thanks!