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Bug#1000481: Bullseye kernel hangs while initialising i915 gpu driver on old intel graphic chip



Control: found -1 linux/5.10.106-1
Control: found -1 linux/5.16.12-1~bpo11+1

On Friday, 10 June 2022 07:57:12 CEST Bogdan Veringioiu wrote:
> the bug is still exists in kernel version 5.10.106 (32 bit).
> 
> Also tried a newer kernel linux-image-5.16.0-0.bpo.4 from
> bullseye-backports, with the same result.

Thanks for that. Metadata updated accordingly.

> Symptoms:
> The monitor  gets blank when the i915 changes resolution on boot.
> The PC remains accessible (ssh).

That seems different from what Ben reported, which may be useful info.
@Ben: can you tell whether you can ssh into your device or not?

> The intel_iommu=off does not work.
> 
> Some details about the system below:
> 
> $ dmesg | grep 915
> 
> [    8.816308] i915 0000:00:02.0: vgaarb: deactivate vga console
> [    8.846333] i915 0000:00:02.0: [drm] Failed to find VBIOS tables (VBT)

When putting "i915 [drm] Failed to find VBIOS tables (VBT)" into a search 
engine, most results were about GPU passthrough (VMs).
I don't see a (direct) connection with this bug, but thought I'd share this 
observation in case it might give a clue to others.

> [    8.846882] i915 0000:00:02.0: vgaarb: changed VGA decodes:
> olddecodes=io+mem,decodes=io+mem:owns=io+mem
> [    9.116269] i915 0000:00:02.0: [drm] Initialized overlay support.
> [    9.118527] [drm] Initialized i915 1.6.0 20200917 for 0000:00:02.0 on
> minor 0
> [    9.163178] fbcon: i915drmfb (fb0) is primary device
> [    9.203620] i915 0000:00:02.0: [drm] fb0: i915drmfb frame buffer device

Request to both Bogdan and Ben:
Can you share the full dmesg output of the 'failing' system and in case of a 
working workaround (like "intel_iommu=off"), also the dmesg output of that?

The full dmesg output may contain clues as to why this issue occurs.

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