Can't run manjaro from portable disk on a differrent pc - Error symbol grub_debug_malloc not found & Can't enter GUI

[malone]

I reinstalled all.

output from:
pacman -Qs nvidia

[manjaro /]# pacman -Qs nvidia
local/lib32-libvdpau 1.5-1
    Nvidia VDPAU library
local/libvdpau 1.5-1
    Nvidia VDPAU library
local/mhwd-nvidia 515.57-1
    MHWD module-ids for nvidia 515.57
local/mhwd-nvidia-340xx 340.108-1
    MHWD module-ids for nvidia 340.108
local/mhwd-nvidia-390xx 390.151-2
    MHWD module-ids for nvidia 390.151
local/mhwd-nvidia-470xx 470.129.06-1
    MHWD module-ids for nvidia 470.129.06
local/xf86-video-nouveau 1.0.17-2 (xorg-drivers)
    Open Source 3D acceleration driver for nVidia cards

MHWD module-ids can’t be uninstalled. So it looks like I need to uninstall these packages?

lib32-libvdpau libvdpau xf86-video-nouveau

[manjaro /]# pacman -R lib32-libvdpau libvdpau xf86-video-nouveau
checking dependencies...
error: failed to prepare transaction (could not satisfy dependencies)
:: removing libvdpau breaks dependency 'libvdpau' required by ffmpeg
:: removing libvdpau breaks dependency 'libvdpau' required by ffmpeg4.4
:: removing lib32-libvdpau breaks dependency 'lib32-libvdpau' required by lib32-libva-vdpau-driver
:: removing libvdpau breaks dependency 'libvdpau' required by libva-vdpau-driver
:: removing libvdpau breaks dependency 'libvdpau' required by untrunc-git

[brahma]

dont uninstall them…
reinstall the lightdm:
remove it first:

sudo pacman -R lightdm lightdm-gtk-greeter lightdm-gtk-greeter-settings

install it again:

sudo pacman -S lightdm lightdm-gtk-greeter lightdm-gtk-greeter-settings

reboot … you can do it from tty, dont need to waste time chrooting, just take a picture of those command with your phone

[malone]

I reinstalled but still can’t boot normally. Also I tried reinstalled the whole system in the tty mode again. If no other ways, I will try to plug into my old laptop with both intel and nvidia card. What steps do you suggest?

[brahma]

just checked your logs above, and you have installed optimus, so remove it:
pamac remove optimus-manager optimus-manager-qt
reboot and see if it helped

[malone]

It now boot normally on linux 515 and 518 still backscreen on linux 510. I see the only change is the login dialog interface become gray instead of green. But it’s enough for me.

Thank you quite a lot!!!

[brahma]

its finally over haha… so uninstall the 5.10 since it doesnt work…

[malone]

You guess what happened when I plug my portable disk into my old laptop. All the three linux kernel can boot normally.