Bug 201505

Summary:	Resume from suspend does not power up the display
Product:	Drivers	Reporter:	Jan Ziak (0xe2.0x9a.0x9b)
Component:	Video(DRI - non Intel)	Assignee:	drivers_video-dri
Status:	RESOLVED OBSOLETE
Severity:	normal	CC:	alexdeucher, harry.wentland, nicholas.kazlauskas, soprwa, ville.syrjala
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	4.19	Subsystem:
Regression:	No	Bisected commit-id:
Attachments:	dmesg dmesg with resume-from-suspend bisect.log

Description Jan Ziak 2018-10-24 13:53:00 UTC

Resuming the machine from suspend-to-ram no longer restores power to the display attached to an AMD GPU in Linux 4.19 (assuming the display has switched to sleep mode by itself because the computer hasn't been in use for a while).

If the display is still powered on when resuming, it ends up blank.

Linux 4.18 did not contain this bug.

Kernel: 4.19
Module: amdgpu
GPU: R9 390

Comment 1 Michel Dänzer 2018-10-24 14:16:29 UTC

Please attach the output of dmesg.

Comment 2 Jan Ziak 2018-10-24 14:36:40 UTC

Created attachment 279135 [details]
dmesg

dmesg without any resume-from-suspend.

Comment 3 Jan Ziak 2018-10-24 15:50:03 UTC

Created attachment 279137 [details]
dmesg with resume-from-suspend

dmesg with resume-from-suspend. It contains 2 amdgpu failures to send a message.

Comment 4 Alex Deucher 2018-10-24 19:42:04 UTC

Can you bisect?

Comment 5 Jan Ziak 2018-10-25 15:04:54 UTC

Created attachment 279151 [details]
bisect.log

I bisected the issue but encountered some inconsistencies along the way:

- The bisected commit ends up with a white display after resume-from-suspend, while I was expecting a blank display.

- I started bisecting with v4.18 good and v4.19 bad. The bisected commit has date 25 may 2018, while 4.18 has been released on 12 aug 2018.

Comment 6 Jan Ziak 2020-05-11 19:57:05 UTC

I am resolving this issue as obsolete because I stopped using R9 390 as a primary GPU some time ago. If somebody can still reproduce this bug please reopen this issue.