how to make multiple-buffer effect immediately

[jiejia]

bsp:linux3.0.35 cpu:imx6q. My lcd resolution is 800*600

To use multiple-buffer rendering, I set 'export FB_MULTI_BUFFER=2'.

And then I print the resolution of fb0:

xres = 800

yres = 600

var.xres_virtual = 800

var.yres_virtual = 600

I download the gpu_sdk_v1.00.gz, and execute the GLES example in the file.

And then I print the resolution of fb0:

xres = 800

yres = 600

var.xres_virtual = 800

var.yres_virtual = 1200

Why multiple-buffer no effect immediately after I set 'export FB_MULTI_BUFFER=2'?

[Bio_TICFSL · Accepted solution]

Hi jie,

You should upgrade the bsp to 3.14.28 this bsp includes the vivante drv, while 3.0.35 you have to pass it by module.

Regards

[Bio_TICFSL]

Hi jie,

BSP 3.0.35 includes vivante driver 4.6.9 p12v and this version has some bugs regarding FB_MULTIBUFFER, I strongly recommend to update vivante 5.0.11p6 included in BSP 3.14.28

Regards

[jiejia]

Hi Bio_TICFSL

Should I update the vivante_drv.c and vivante_drv.h?  Or,I have to update the kernel to 3.14.28?

Regards