[Bug 253982] Display goes dead with intel_do_flush_locked failed: Input/output error on Dell XPS m1330

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253982

            Bug ID: 253982
           Summary: Display goes dead with intel_do_flush_locked failed:
                    Input/output error on Dell XPS m1330
           Product: Base System
           Version: 12.2-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: freebsd-ports at jan0sch.de

Hi,

I'm not sure where to file this bug exactly, but since I upgraded my old Dell
XPS m1330 from 12.1 to 12.2 I experience weird issues with the display possibly
related to OpenGL. Applications triggering this behaviour so far are: ktouch,
vice, scummvm and possibly others. It seems only programs using OpenGL trigger
this.

1. I start a program (i.e. ktouch)
2. after 1-2 seconds the display goes dark
3. in the error log of X is the line `intel_do_flush_locked failed:
Input/output error`
4. no graphics or text console works (display is completely dead until reboot)

However the machine still runs, I can ssh into it and verify that. But display
is and stays dead until reboot.

In dmesg there is this message:

```
drmn0: =======================================================
drmn0: This code is deprecated.  Install the graphics/drm-kmod pkg
drmn0: =======================================================
drmn0: Deprecated code (to be removed in FreeBSD 13): drm2 drivers
drmn0: =======================================================
drmn0: This code is deprecated.  Install the graphics/drm-kmod pkg
drmn0: =======================================================
drmn0: Deprecated code (to be removed in FreeBSD 13): drm2 drivers
drmn0: <Intel i965GM> on vgapci0
```

The package drm-kmod is installed.

Are there any ideas what could be the issue here (kernel, drm-drivers)?
And how can I help debugging/solving this?

Kind regards,

Jens

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