topic Re: Backlight issue in XEN in i.MX Processors

Backlight issue in XEN

yeswanth — Mon, 23 Dec 2024 15:18:01 GMT

I have built XEN image in core-image-Weston for the IMX8QXP board. While booting into into XEN it throwing following DRM error:

***************************************************

imx-drm display-subsystem: failed to bind ldb@562210e0 (ops imx_ldb_ops): -517

***************************************************

I have resolved that error by including that respective node and its PWM dependencies as passthrough node as below mentioned:

&ldb2 {

xen,passthrough;

}

After that it booted successfully without any error but the backlight of the display didn't turned UP. What more need to be done to bring up the display in xen for imx8qxp.

Thankyou,

yeswanth

Re: Backlight issue in XEN

Bio_TICFSL — Thu, 02 Jan 2025 14:33:45 GMT

Hello,

I don't think changing any such interactively is supported on any Embedded Linux platform. Usually, such frame buffer colour depth is a boot time setting. However, nowadays NXP is using DRM/KMS for the i.MX 8 series and the framebuffer is obsolete and just emulated anyway. So what exactly is it that you are trying to achieve. How/where exactly are you trying to display what exactly?

Regards

Re: Backlight issue in XEN

yeswanth — Mon, 13 Jan 2025 13:26:44 GMT

I have booted the IMX8QXPMEK board using XEN. It booted successfully but i can't see anything on display even backlight also didn't turned up. How do i bring up the display in XEN domain.