display problem after locking screen

[ktat]

I've got an old hp pavilion g series laptop with Debian 10 installed.

I'm not sure what the issue is, but I'm assuming that it relates to X. I've had a look through the forums, however can't find anything like the problem I'm experiencing.

Every time I login after closing my laptop the display looks like this:
https://imgur.com/a/2IPJzEh
I have my power settings to lock my screen when the laptop is closed. This also happens when I start up the game 0 AD. My fix at the moment is to log out and then log back in. Obviously, it would be great if I didn't have to do this every time I closed my laptop.

[Head_on_a_Stick]

Graphics hardware & driver? Messages in ~/.xsession-errors or the systemd journal?

[ktat]

Graphics hardware and driver (not sure how to id the driver):

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inxi -Fx | grep -A 5 "Graphics:"
Graphics:  Device-1: Advanced Micro Devices [AMD/ATI] Sumo [Radeon HD 6480G] vendor: Hewlett-Packard driver: N/A 
           bus ID: 00:01.0 
           Device-2: Advanced Micro Devices [AMD/ATI] Seymour [Radeon HD 6400M/7400M Series] vendor: Hewlett-Packard 
           driver: N/A bus ID: 01:00.0 
           Display: x11 server: X.Org 1.20.4 driver: ati,vesa unloaded: fbdev,modesetting,radeon resolution: 1366x768~N/A 
           OpenGL: renderer: llvmpipe (LLVM 7.0 128 bits) v: 3.3 Mesa 18.3.6 direct render: Yes 

content of ~/.xsession-errors (rather than paste a wall of text, I've just posted what I think may be most relevant. If something important is missing, let me know)

/usr/bin/startxfce4: X server already running on display :0
xfce4-session-Message: 10:34:09.238: SSH authentication agent is already running
gpg-agent[2725]: WARNING: "--write-env-file" is an obsolete option - it has no effect
gpg-agent: a gpg-agent is already running - not starting a new one

(xfce4-session:2697): xfce4-session-WARNING **: 10:34:09.267: gpg-agent returned no PID in the variables

(xfwm4:2727): xfwm4-WARNING **: 10:34:09.498: Error opening /dev/dri/card0: No such file or directory

(xfwm4:2727): xfwm4-WARNING **: 10:34:10.032: output size (1366x768) and logical screen size (1368x768) do not match

(clipit:2794): Gdk-CRITICAL **: 10:34:12.730: gdk_window_thaw_toplevel_updates: assertion 'window->update_and_descendants_freeze_count > 0' failed

(blueman-applet:2772): Gdk-CRITICAL **: 10:34:14.686: gdk_window_thaw_toplevel_updates: assertion 'window->update_and_descendants_freeze_count > 0' failed
[28600712/103419.761935:ERROR:edid_parser.cc(102)] Too short EDID data: manufacturer id
[28990712/103421.026011:ERROR:sandbox_linux.cc(374)] InitializeSandbox() called with multiple threads in process gpu-process.

(mousepad:3014): Gtk-WARNING **: 10:34:29.443: Theme parsing error: <data>:2:29: The style property GtkButton:default-border is deprecated and shouldn't be used anymore. It will be removed in a future version

(mousepad:3014): Gtk-WARNING **: 10:34:29.447: Theme parsing error: <data>:3:37: The style property GtkButton:default-outside-border is deprecated and shouldn't be used anymore. It will be removed in a future version

(mousepad:3014): Gtk-WARNING **: 10:34:29.448: Theme parsing error: <data>:4:27: The style property GtkButton:inner-border is deprecated and shouldn't be used anymore. It will be removed in a future version

(mousepad:3014): Gtk-WARNING **: 10:34:29.449: Theme parsing error: <data>:5:31: The style property GtkWidget:focus-line-width is deprecated and shouldn't be used anymore. It will be removed in a future version

(mousepad:3014): Gtk-WARNING **: 10:34:29.449: Theme parsing error: <data>:6:28: The style property GtkWidget:focus-padding is deprecated and shouldn't be used anymore. It will be removed in a future version

My apologies, I'm only slightly familiar with bash and the inner workings of linux. I'm not sure where/how to access the systemd journal.

[cuckooflew]

I'm not sure where/how to access the systemd journal.

Why not educate your self a little ?, all you need to do is ask your favourite search engine : "how to access the systemd journal."
You will find all kinds of wonderful documentation, this: https://www.linode.com/docs/quick-answe ... ournalctl/ is one of many educational documents.

I will agree, perhaps could be more clear, to be honest I am not sure, either I think they mean the

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# journalctl

command, note the # is not part of the command, it means you must use sudu or su- to become root.
To learn more about the command 'man journalctl' or a search . "How to use journalctl"