Re: [PATCH drm-next] drm/bochs: Add support for drm_panic

[Jocelyn Falempe]

On 15/07/2025 22:35, Askar Safin wrote:
>   ---- On Tue, 15 Jul 2025 12:57:04 +0400  Jocelyn Falempe <jfalempe@xxxxxxxxxx> wrote ---
>   > "Normal panics", is just the console logs through fbcon. The problem is
>
> Thank you for answer! Is this possible to configure system such that fbcon works normally,
> VTs work normally (i. e. via framebuffer), but when panic happens, it is displayed via drm_panic? This seems to
> be solution to the problem.

Yes, that's the default if you use a drm driver like bochs with fbdev 
emulation enabled. (Of course you can't have DRM panic on a pure fbdev 
driver).

There was a concurrency problem between fbcon and DRM panic, and I've 
solved it a year ago with:
https://patchwork.freedesktop.org/series/136182/

So make sure you have the following in your .config:

CONFIG_FRAMEBUFFER_CONSOLE=y
CONFIG_DRM_FBDEV_EMULATION=y
CONFIG_DRM_PANIC=y
CONFIG_DRM_PANIC_SCREEN="kmsg"

Best regards,

--

Jocelyn

> --
> Askar Safin
> https://types.pl/@safinaskar