Bug#927324: upgrade-reports: Buster upgrade: Z270 + Kaby Lake iGPU (HDMI -> LCD,) suspends but resume display unstable.

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From: tester <[email protected]>
To: Debian Bug Tracking System <[email protected]>
Subject: upgrade-reports: Buster upgrade: Z270 + Kaby Lake iGPU (HDMI -> 
LCD,) suspends but resume display unstable.
Message-ID: <155554120305.3849.15861541570648609572.reportbug@busterupgrade>
X-Mailer: reportbug 7.5.2
Date: Thu, 18 Apr 2019 07:46:43 +0900

Package: upgrade-reports
Severity: normal

Dear Maintainer,

* Intel Z270 (ASUS) and Core i5-7500.

* GNOME, uswsusp, suspend-to-RAM.

* suspend and resume are fine.

* On resume, system itself resumes, but not displays; no HDMI signal.

* Changing ttys solve it.

   e.g.)
   Assume GNOME session on tty2. Intel Kaby Lake iGPU -> HDMI -> LCD.

   suspend -> resume -> HDMI signal lost, blank screen -> tty5
              HDMI signal on -> HDMI signal lost, blank -> tty2 -> Lock 
screen recovers

Related Log (partial)
======================

gnome-shell[2403]: JS ERROR: TypeError: monitor is null
 
_reposition@resource:///org/gnome/shell/ui/boxpointer.js:508:13
 
wrapper@resource:///org/gnome/gjs/modules/_legacy.js:82:22
 
_allocate@resource:///org/gnome/shell/ui/boxpointer.js:235:13
 
wrapper@resource:///org/gnome/gjs/modules/_legacy.js:82:22
 
_init/<@resource:///org/gnome/shell/ui/layout.js:211:17
gnome-shell[2403]: JS ERROR: TypeError: monitor is null
 
_reposition@resource:///org/gnome/shell/ui/boxpointer.js:508:13
 
wrapper@resource:///org/gnome/gjs/modules/_legacy.js:82:22
 
_allocate@resource:///org/gnome/shell/ui/boxpointer.js:235:13
 
wrapper@resource:///org/gnome/gjs/modules/_legacy.js:82:22
 
_init/<@resource:///org/gnome/shell/ui/layout.js:211:17
kernel: e1000e: enp0s31f6 NIC Link is Up 1000 Mbps Full Duplex, Flow 
Control: Rx/Tx
gnome-shell[2403]: Failed to apply DRM plane transform 0: Permission denied
kernel: rfkill: input handler enabled
systemd[1]: Started Getty on tty5.
gsd-color[2550]: failed to create device: failed to obtain 
org.freedesktop.color-manager.create-device auth
gsd-color[2550]: could not find device: property match 
'XRANDR_name'='HDMI-2' does not exist

FYI
===

"CPU C state 7s report" by BIOS makes resume screen completely unavailable.
"CPU C state 7 report" works.

Regards.

-- System Information:
Debian Release: buster/sid
   APT prefers testing
   APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 4.19.0-4-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), 
LANGUAGE=en_US:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled