[Bug 221421] New: amdgpu fails to display anything after resume from S3 suspend

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=221421

            Bug ID: 221421
           Summary: amdgpu fails to display anything after resume from S3
                    suspend
           Product: Drivers
           Version: 2.5
          Hardware: AMD
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: 0456523@gmail.com
        Regression: No

Hardware:
    Machine: Dell Inspiron 15 3525
    CPU:     AMD Ryzen 7 5825U
    GPU:     AMD Barcelo [Integrated]
    RAM:     16GB (2x8GB) of RAM, 32GB of swap
    Distro:  Arch Linux
Current kernel version: 6.19.14

This laptop originally did not advertise S3 sleep support in the DSDT. S0ix was
chewing up my battery so I followed a guide like this
(https://dev.to/epassaro/fix-suspend-issues-on-dell-7405-2-in-1-3l1b) to patch
S3 sleep back in. I still have the files from back when I did that if they are
needed. Another issue is that the touchpad also will immediately wake the
laptop back up with no interaction (which I fixed with a udev rule that matches
the touchpad by name and sets ATTR{power/wakeup}="disabled"), but that's a
separate issue.

Steps to reproduce and what happens:
    1. Start up
    2. Log in to TTY
    3. Run systemctl suspend
    4. Display goes black and backlight turns off, and the system goes to sleep
    5. Wake the system up by hitting a key
    6. System wakes up
    7. Backlight turns on
    8. Display remains black

This only happens when resuming from S3 sleep and does not happen when resuming
from S0ix or hibernation.

There are a few things that worked or used to work to restore the image on the
display:
Connecting an external display will produce an image on the external display
just fine, and changing the resolution of the main display worked in restoring
the image to it last time I tried, but having to grab my spare monitor out of
the closet and hook it up is a massive pain.
Doing sudo cat /sys/kernel/debug/dri/128/amdgpu_gpu_recover used to work
sometimes, but it seems to now have no effect other than toggling the backlight
off then back on.

I have also tried passing in acpi.prefer_microsoft_guid=1 and
amdgpu.dcdebugmask=0x10 during boot but neither had any effect at all (good or
bad). I checked the kernel logs and there does not seem to be any obvious
errors (amdgpu-related or not) when suspending and resuming.

This is a massive pain since S0ix or hibernation are the only 2 ways to avoid a
black screen on resume, but S0ix is unusably power-draining, and hibernation is
still considerably slower than it is on Windows.

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