System freeze on display re-activation persists

Alex Deucher alexdeucher at
Thu Nov 2 13:38:37 UTC 2017

On Thu, Nov 2, 2017 at 2:36 AM, Martin Babutzka
<martin.babutzka at> wrote:
> Dear AMD developers,
> I wanted to mention that the regression in amd-staging-drm-next which I
> reported on the 29.09. and the 06.10. still exists with the latest tree
> state of the branch.
> A crash/freeze occurs after the screen is re-enabled either from
> suspend or from screen locking (which shuts off the display as well).
> The system lock-timing varies: It can get stuck at a blank screen, at
> the login screen or even shortly after a login.
> The kernel is the unmodified amd-staging-drm-next running with my Tonga
> GPU. It does not occur in the official 4.13 kernel of Ubuntu 17.10.
> Unfortunately I failed to bisect it to the causing commit but the issue
> is there for a pretty long time in the 4.13 kernel, most likely merged
> into the code before 10.09.
> Did nobody else from this mailing list experience the same issue?

It was reported and confirmed that this patch fixes it:

I'm running a tonga board now and have no problems with dpms.


> Many regards,
> Martin
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