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Re: Trying to start Xorg on a vanilla bullseye on rpi4

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Replying to a very old email of mine below just for an update. At the time
I never got to the bottom of why I couldn't use Xorg with dual head 4K
monitors. Today I finally got around to trying Bookworm, it made no
difference, however one of my experiments gave me a slightly different
error about memory allocation failing and that lead me to the cma= setting
on the kernel command line.

So I now have dual 4k monitors working on a clean debian install.

cmdline.txt has:
console=tty0 console=ttyS1,115200 root=/dev/mmcblk1p3 rw fsck.repair=yes net.ifnames=0  rootwait iomem=relaxed cma=640M

(I'm not sure exactly what cma= setting is needed, but 768 didn't
boot. Too small and while I do get dual screen output, I can't use
xrandr to rotate/adjust. Even now I can only set the panning once,
further attempts to move the second screen relative to the first fail
and the X server has to be restarted, I assume due to the same memory
issue)

and config.txt has
# Do not modify this file!
#
# It is automatically generated upon install or update of either the
# firmware or the Linux kernel.
#
# If you need to set boot-time parameters, do so via the
# /etc/default/raspi-firmware, /etc/default/raspi-firmware-custom or
# /etc/default/raspi-extra-cmdline files.

# Switch the CPU from ARMv7 into ARMv8 (aarch64) mode
arm_64bit=1

enable_uart=1
upstream_kernel=1

kernel=vmlinuz-6.1.0-28-arm64
# For details on the initramfs directive, see
# https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=10532
initramfs initrd.img-6.1.0-28-arm64

# Inserted by /etc/default/raspi-firmware-custom
hdmi_cvt:0=1920 1080 30 3
hdmi_group:0=2
hdmi_mode:0=87
hdmi_drive:0=2
hdmi_cvt:1=1920 1080 30 3
hdmi_group:1=2
hdmi_mode:1=87
hdmi_drive:1=2


I don't really understand those raspi-firmware-custom settings, however,
this is what was required to give the best quality output on my screens -
I did need to explicitly set them for both outputs.


This is never going to make a gaming setup - it might not even be any good
for movies, but for coding where I have lots of xterms open at once this
doubles the screen real-estate that I have.

Tim.


On Thu, 3 Nov 2022, Tim Woodall wrote:

> Hi,
>
> I have a vanilla installation of debian bullseye on a rpi4
>
> But I cannot get X to start with two 4K screens attached.
>
>
> The error (entire log below) is
> [   707.980] (II) modeset(0): Output HDMI-1 connected
> [   707.980] (II) modeset(0): Output HDMI-2 connected
> [   707.980] (II) modeset(0): Using spanning desktop for initial modes
> [   707.980] (II) modeset(0): Output HDMI-1 using initial mode 3840x2160 +0+0
> [   707.980] (II) modeset(0): Output HDMI-2 using initial mode 3840x2160 
> +3840+0
> [   707.980] (==) modeset(0): Using gamma correction (1.0, 1.0, 1.0)
> [   707.980] (==) modeset(0): DPI set to (96, 96)
> [   707.980] (II) Loading sub module "fb"
> [   707.981] (II) LoadModule: "fb"
> [   707.981] (II) Loading /usr/lib/xorg/modules/libfb.so
> [   707.982] (II) Module fb: vendor="X.Org Foundation"
> [   707.982]    compiled for 1.20.11, module version = 1.0.0
> [   707.982]    ABI class: X.Org ANSI C Emulation, version 0.4
> [   707.983] (II) UnloadModule: "fbdev"
> [   707.983] (II) Unloading fbdev
> [   707.983] (II) UnloadSubModule: "fbdevhw"
> [   707.983] (II) Unloading fbdevhw
> [   707.999] (EE) Fatal server error:
> [   707.999] (EE) AddScreen/ScreenInit failed for driver 0
> [   707.999] (EE) [   707.999] (EE)
>
> Which doesn't really tell me a lot...
>
> If I start with one screen connected and then plug in the other then I
> get a mirrored display whan I start the second output with xandr. But
> any attempt to use xrandr to move them fails.
>
>
>
> root@test17:~# xrandr --output HDMI-2 --mode 3840x2160 --panning 
> 3840x2160+0+0
> root@test17:~# xrandr
> Screen 0: minimum 320 x 200, current 3840 x 2160, maximum 7680 x 7680
> HDMI-1 connected primary 3840x2160+0+0 (normal left inverted right x axis y 
> axis) 600mm x 340mm
>   3840x2160     27.26*+  30.00    25.00    24.00    29.97    23.98
>   2560x1440     59.95
>   1920x1080     60.00    59.94    30.00    29.97
>   1920x1080i    60.00    59.94
>   1600x900      60.00
>   1280x1024     60.02
>   1280x800      59.91
>   1280x720      60.00    59.94
>   1024x768      60.00
>   800x600       60.32
>   720x480       60.00    59.94
>   640x480       60.00    59.94 HDMI-2 connected 3840x2160+0+0 (normal left 
> inverted right x axis y axis) 600mm x 340mm
>   3840x2160     27.26*+  30.00    30.00    25.00    24.00    29.97    23.98
>   2560x1440     59.95
>   1920x1080     60.00    60.00    59.94    30.00    24.00    29.97    23.98
>   1920x1080i    60.00    59.94
>   1600x900      60.00
>   1280x1024     60.02
>   1280x800      59.91
>   1280x720      60.00    59.94
>   1024x768      60.00
>   800x600       60.32
>   720x480       60.00    59.94
>   640x480       60.00    59.94
>
>
> root@test17:~# xrandr --output HDMI-2 --mode 3840x2160 --panning 
> 3840x2160+3840+0
> X Error of failed request:  BadMatch (invalid parameter attributes)
>  Major opcode of failed request:  140 (RANDR)
>  Minor opcode of failed request:  7 (RRSetScreenSize)
>  Serial number of failed request:  35
>  Current serial number in output stream:  36
> root@test17:~#
>
>
> Does anyone have any ideas of what I need to do to get this working?
>
> Even just being able to start X without having to unplug a screen would be a
> start.
>
> Tim.
>
>

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Re: Trying to start Xorg on a vanilla bullseye on rpi4 Tim Woodall <debianuser@woodall.me.uk> - 2024-12-11 20:00 +0100

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