System with kernel 4.21 hang immediately after start (invalid opcode: 0000 [#1] SMP NOPTI)

Michel Dänzer michel at
Fri Jan 4 15:33:12 UTC 2019

On 2019-01-04 4:24 p.m., Alex Deucher wrote:
> On Fri, Jan 4, 2019 at 9:52 AM Mikhail Gavrilov
> <mikhail.v.gavrilov at> wrote:
>> Hi folks I found that kernel 4.21 unworkable with AMD hardware.
>> Also I am make kernel bisect and founded the blame commit.
>> First bad commit: [674e78acae0dfb4beb56132e41cbae5b60f7d662]
>> drm/amd/display: Add fast path for cursor plane updates
> IIRC, the issue only shows up with newer versions of the ddx.

Wayland compositors seem to hit it as well, I think Mikhail is using
GNOME on Wayland.

Earthling Michel Dänzer               |     
Libre software enthusiast             |             Mesa and X developer

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