Re: Restarting video driver to turn on external vga port

[Robert Moskowitz <rgm@xxxxxxxxxxxxxxx>]

On 6/30/23 07:44, George N. White III wrote:

On Fri, Jun 30, 2023 at 6:56 AM Robert Moskowitz <rgm@xxxxxxxxxxxxxxx> 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?

    I mean I was out from town with my notebook and no external monitor
    connected.  And I suspended before I left, and then multiple times
    while away I resumed and suspended and so forth.

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)?

    It was as of Tuesday before leaving.

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. 

    I use the everything network install to install workstation and
    Xfce.  Should have said Xfce, as it impacts what you say below.

Have you tried Settings/Displays to detect the VGA monitor?

    Both from <winkey+P> and from the app pull down to get into
    Settings/Display.  The external monitor is just not listed.
    
    BTW, it is often the case with this system that the external monitor
    is not listed, but just gets turned on, which is plain weird.

   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.

    Before suspending to travel, I unplug everything (power, vga, usb
    kybd/mouse) then suspend.  Once home I connect everything and then
    open the notebook.

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. 

    I always work at my desk with the notebook open so I have the
    internal mirroring to the external.
    
    and
    
    # udevadm monitor
    monitor will print the received events for:
    UDEV - the event which udev sends out after rule processing
    KERNEL - the kernel uevent
    
    now nothing in the terminal window.  Like this is hung?  Or not
    expected to return back to the prompt?

Example for Xorg:

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

    How is this suppose to work:
    
KERNEL=="card1", SUBSYSTEM=="drm", ENV{DISPLAY}=":0", ENV{XAUTHORITY}="/home/vllblvck/.Xauthority", RUN+="/usr/bin/setup-ext-display.sh"

Is KERNEL a variable or is there some udev file I am suppose to set up?  No, at least recent, experience with udev stuff..

 

--

George N. White III

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