On Fri, Jun 30, 2023 at 6:56 AM Robert Moskowitz <r...@htt-consult.com>
wrote:

> I have a Lenovo x140e running F38.
>
> The video driver is normally the Radeon, but some time ago here I was
> told to change the amdgpu driver but
>
> lspci -nnk | grep -iE "VGA|DISPLAY" -A3
> 00:01.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
> [AMD/ATI] Kabini [Radeon HD 8330] [1002:9832]
>      Subsystem: Lenovo Device [17aa:2219]
>      Kernel driver in use: amdgpu
>      Kernel modules: radeon, amdgpu
>
> But sometimes after a few suspend/unsuspend when remote and no external
> VGA, this system forgets about the external monitor.
>

By "remote" do you mean using the laptop away from the VGA monitor or
logging in from another (remote) system?  If you are reconnecting the
VGA after using the laptop in another location, I assume the laptop
is in some "suspend" mode.  When using the VGA monitor do you also
use the laptop display or is the laptop closed?

>
> Is there someway to force the video driver to wake up and see the
> attached vga monitor?
>

First, is your system fully updated including vendor firmware (so others
will be using
the same software versions)?

Are you using F38 Workstation and Gnome?   I have a desktop that has a
monitor and a TV that is usually turned off.   When first booted the login
shows on the TV, so I use Settings/Displays to make the monitor the
main display.   The system never suspends, but logging out and back in
some I sometimes have to connect the TV to get the login prompt.

Have you tried Settings/Displays to detect the VGA monitor?   Is the
system suspended or awake when VGA is connected, and is the monitor
on or off when making the connection?  A workaround may be a simple
change to your usual routine.  Normally udev should handle events like
connecting an external monitor.   If you have a way to ssh into the laptop
you could use "udevadm monitor" to see what happens when connecting the
monitor with the laptop lid closed.

Example for Xorg:
<
https://unix.stackexchange.com/questions/675024/udev-rule-for-connecting-external-display-not-working
>

-- 
George N. White III
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