[Intel-gfx] i915: v5.10.23: kernel hangs at boot when external monitor is connected?!

[Imre Deak]

Hi,

On Sun, Mar 21, 2021 at 12:44:24PM +0100, Thomas Meyer wrote:
> Hi,
> 
> when booting with an external monitor connected the boot process seems to stop
> in the kernel. No additional output is show, it just hangs.
> 
> kernel is 5.10.23 and driver is i915. When unplugging and reset computer, the
> system starts normal. Any ideas what could be the culprit and what to enable
> in kernel config to get a bit more insight what's probably going on?

Thanks for the report.

Please open a ticket at
https://gitlab.freedesktop.org/drm/intel/-/issues/new

You can capture a dmesg log by booting with drm.debug=0x1e, and either
configuring netconsole as built-in, passing the required netconsole=
boot params for it [1], or building i915 as a module and modprobing it
only from the console (by booting with modprobe.blacklist=i915,snd_hda_intel).  

--Imre

[1] https://www.kernel.org/doc/Documentation/networking/netconsole.txt

> 
> mfg
> thomas
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