Bug 1636460

Summary:	mutter sometimes fails to unblank screen when unlocked by a user switch
Product:	Red Hat Enterprise Linux 7	Reporter:	Ray Strode [halfline] <rstrode>
Component:	mutter	Assignee:	Jonas Ådahl <jadahl>
Status:	CLOSED ERRATA	QA Contact:	Desktop QE <desktop-qa-list>
Severity:	high	Docs Contact:
Priority:	high
Version:	7.4	CC:	amike, ayadav, bgollahe, chorn, desktop-qa-list, fmuellner, jkoten, mboisver, mclasen, mkrajnak, rstrode, tpelka, yoguma, yzheng
Target Milestone:	rc
Target Release:	7.7
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	mutter-3.28.3-10.el7	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:	1489977	Environment:
Last Closed:	2019-08-06 12:37:45 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1489977
Bug Blocks:	1571842, 1588877, 1597339, 1607454, 1632807, 1635747, 1640918, 1656436, 1707454

Description Ray Strode [halfline] 2018-10-05 13:03:49 UTC

+++ This bug was initially created as a clone of Bug #1489977 +++
--- Additional comment from Jiri Koten on 2018-10-05 08:53:08 EDT ---

(In reply to Ray Strode [halfline] from comment #44)
> Created attachment 1490684 [details]
> this should fix it

I can confirm the fix worked for me. The login screen always starts when I switch user or logout.

The only issue I have found is that sometimes when I unlock the user session the screen remains blank and I have to move mouse to wake up the screen.

--- Additional comment from Ray Strode [halfline] on 2018-10-05 09:00:10 EDT ---

okay thats probably an unrelated issue in mutter.  lets clone that for 7.7

Comment 2 Jonas Ådahl 2019-03-26 14:54:46 UTC

I've been trying to reproduce this to no avail in a up to date 7.7 in a VM. Steps that have worked 10-20 times without any no-unblank issue:

1. Log in user A
2. Switch user via system menu
3. Login user B
4. Switch user via system menu
5. Goto 1.

Comment 3 Jonas Ådahl 2019-03-26 17:21:15 UTC

Same applies using Ctrl-Alt-F#. While switching back and forth, it hasn't failed to unblank.

Comment 4 Jiri Koten 2019-03-28 13:12:57 UTC

I can't reproduce in VM but I'm able to easily reproduce on my ThinkPad X1 Carbon 6th, but probably any laptop with intel GPU should be enough. I use Xorg and modesettings driver. After I unlock the user A, the screen remains blank.

Reproducer is the same as in c#2.

hw: 00:02.0 VGA compatible controller [0300]: Intel Corporation UHD Graphics 620 [8086:5917] (rev 07)

Comment 5 Jiri Koten 2019-03-28 13:14:28 UTC

Tested with:

kernel-3.10.0-957.10.1.el7.x86_64
mutter-3.28.3-6.el7_6.x86_64
xorg-x11-server-Xorg-1.20.1-5.3.el7_6.x86_64

Comment 6 Jonas Ådahl 2019-04-12 14:00:11 UTC

Reproduced on Fedora, and came up with something that should fix it. At least I couldn't reproduce after this, but then again it only reproduced some times without it.

Scratch build available here: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=21154835

Jiri, could you test it?

Comment 7 Jiri Koten 2019-04-15 15:06:32 UTC

Didn't worked for me. I see cursor for a brief moment, but screen remains blank until I move mouse or use keyboard.

Comment 10 Jiri Koten 2019-06-14 11:17:21 UTC

Verified on the latest Snapshot compose.

Comment 12 errata-xmlrpc 2019-08-06 12:37:45 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2019:2044