VGA monitor on Raspberry Pi 4

[moonman]

Hello everybody !

I have Archlinux x86-64 on my PC for several month now and I am sooo happy with it !
(Before I was on Fedora Workstation for about 4 years)

So a few days ago I decided to install Arch ARM as distro for my new Raspberry Pi 4 4GB.
The installation went well, I can connect to ssh and I installed some stuff (mainly GNOME).

But the problem is that I have no video output.

My monitor is a LG, with VGA input connected to VGA/HDMI adaptator and then HMDI/microHDMI adpatator in left microHDMI socket.
The monitor goes on sleep when connected, waiting for the signal.

lspci only returns Ethernet and USB-C connections :
$this->bbcode_second_pass_code('', '
[alarm@alarmpi boot]$ lspci
00:00.0 PCI bridge: Broadcom Inc. and subsidiaries Device 2711 (rev 10)
01:00.0 USB controller: VIA Technologies, Inc. VL805 USB 3.0 Host Controller (rev 01)
')

I'm a newbie on Raspberry.

Thanks for your help !

[moonman]

The video adapter is not on PCI bus so you won't see it with lspci.

$this->bbcode_second_pass_code('', 'dmesg | grep fb') to see messages about the framebuffer.
Are you sure your adapter (HDMI -> VGA) works?

[Quies98]

Good evening, moonman !

Thanks for your answer !

Here is the result :
$this->bbcode_second_pass_code('', '
[root@alarmpi alarm]# dmesg | grep fb
[ 0.000000] Kernel command line: coherent_pool=1M 8250.nr_uarts=0 cma=64M bcm2708_fb.fbwidth=1824 bcm2708_fb.fbheight=984 bcm2708_fb.fbswap=1 smsc95xx.macaddr=DC:A6:32:41:02:63 vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000 root=/dev/mmcblk0p2 rw rootwait console=ttyS0,115200 console=tty1 selinux=0 plymouth.enable=0 smsc95xx.turbo_mode=N dwc_otg.lpm_enable=0 kgdboc=ttyS0,115200 elevator=noop
[ 4.264335] pci_bus 0000:00: root bus resource [mem 0x600000000-0x603ffffff] (bus address [0xf8000000-0xfbffffff])
[ 4.270109] bcm2708_fb soc:fb: FB found 1 display(s)
[ 4.316013] bcm2708_fb soc:fb: Registered framebuffer for display 0, size 1824x984
[ 13.092220] brcmfmac: brcmf_c_preinit_dcmds: Firmware: BCM4345/6 wl0: Feb 27 2018 03:15:32 version 7.45.154 (r684107 CY) FWID 01-4fbe0b04
')

I don't know why, when I started the Raspberry, the display worked suddently.

However, I still can't start a gnome-session :

$this->bbcode_second_pass_code('', '
[root@alarmpi alarm]# gnome-session

** (process:1061): WARNING **: 00:02:16.191: Could not make bus activated clients aware of XDG_CURRENT_DESKTOP=GNOME environment variable: The connection is closed
Terminated

')

Any solution ?

Thanks a lot !