I use the RPI5 with a 5.5 inch lcd from Waveshare (www.waveshare.com/5.5inch-1440x2560-LCD.htm).
The display only supports a resolution of 1440x2560 pixel. My problem is, that the content of boot screen is broken the first seconds. After a few seconds the display is driven with the correct resolution.
I can retrace this issue in dmesg:simple-framebuffer drives the display only with 640x480x16. Later, vc4-drm does it with the correct resolution of 1440x2560 pixel.
Do you have an idea, how to configure simple-framebuffer with a resolution of 1440x2560?
I use Raspberry PI OS lite and have updated it:
I get the following output from these programs:
and
I haven't modified /boot/firmware/config.txt.
But I have added "video=HDMI-A-1:1440x2560@50" to /boot/firmware/cmdline.txt:I have also tested:I have already found similar threads but they haven't solved my problem:
viewtopic.php?p=2325578&hilit=simple+fr ... r#p2325578
viewtopic.php?t=353936&hilit=simple+fra ... r&start=50
Again my question: Do you have an idea, how to configure simple-framebuffer with a resolution of 1440x2560?
The display only supports a resolution of 1440x2560 pixel. My problem is, that the content of boot screen is broken the first seconds. After a few seconds the display is driven with the correct resolution.
I can retrace this issue in dmesg:
Code:
...[ 1.587933] simple-framebuffer 3fb00000.framebuffer: framebuffer at 0x3fb00000, 0x96000 bytes[ 1.596503] simple-framebuffer 3fb00000.framebuffer: format=r5g6b5, mode=640x480x16, linelength=1280[ 1.612925] simple-framebuffer 3fb00000.framebuffer: fb0: simplefb registered!...[ 8.060807] vc4-drm axi:gpu: bound 107c706400.hdmi (ops vc4_hdmi_ops [vc4])[ 8.061437] vc4-drm axi:gpu: bound 107c500000.mop (ops vc4_txp_ops [vc4])[ 8.061517] vc4-drm axi:gpu: bound 107c501000.moplet (ops vc4_txp_ops [vc4])[ 8.061567] vc4-drm axi:gpu: bound 107c410000.pixelvalve (ops vc4_crtc_ops [vc4])[ 8.061610] vc4-drm axi:gpu: bound 107c411000.pixelvalve (ops vc4_crtc_ops [vc4])[ 8.112806] [drm] Initialized vc4 0.0.0 for axi:gpu on minor 1[ 8.175370] vc4-drm axi:gpu: [drm] fb0: vc4drmfb frame buffer device[ 8.239619] vc4-drm axi:gpu: [drm] User-defined mode not supported: "1440x2560": 50 263340 1440 1560 1720 2000 2560 2561 2564 2633 0x20 0x6Do you have an idea, how to configure simple-framebuffer with a resolution of 1440x2560?
I use Raspberry PI OS lite and have updated it:
Code:
~# uname -aLinux dsc 6.12.36-v8-16k+ #1892 SMP PREEMPT Mon Jul 7 17:14:15 BST 2025 aarch64 GNU/LinuxCode:
~# kmsprint -mConnector 0 (33) HDMI-A-1 (connected) 0 1440x2560@50.00 206.000 1440/10/10/140/+ 2560/11/2/2/+ 50 (50.00) P|U|D Code:
~# fbset -imode "1440x2560" geometry 1440 2560 1440 2560 16 timings 0 0 0 0 0 0 0 rgba 5/11,6/5,5/0,0/0endmodeFrame buffer device information: Name : vc4drmfb Address : 0 Size : 7372800 Type : PACKED PIXELS Visual : TRUECOLOR XPanStep : 1 YPanStep : 1 YWrapStep : 0 LineLength : 2880 Accelerator : NoBut I have added "video=HDMI-A-1:1440x2560@50" to /boot/firmware/cmdline.txt:
Code:
console=serial0,115200 console=tty1 root=PARTUUID=f7e52863-02 rootfstype=ext4 fsck.repair=yes rootwait video=HDMI-A-1:1440x2560@50 fbcon=rotate:3 fbcon=scroll:1 splash logo.nologoCode:
video=HDMI-A-1:1440x2560M@50video=HDMI-A-1:1440x2560M-16@50fbcon=width:1440,height:2560,rotate:3viewtopic.php?p=2325578&hilit=simple+fr ... r#p2325578
viewtopic.php?t=353936&hilit=simple+fra ... r&start=50
Again my question: Do you have an idea, how to configure simple-framebuffer with a resolution of 1440x2560?
Statistics: Posted by dsteinwe — Wed Jul 16, 2025 6:13 pm