https://bugs.kde.org/show_bug.cgi?id=359743
Bug ID: 359743
Summary: blanks out original plasma session when I start a new
a new plasma session with GLX + DRI 3 on Intel
Sandybridge graphics
Product: kwin
Version: 5.4.3
Platform: Debian unstable
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: glx
Assignee: kwin-bugs-n...@kde.org
Reporter: mar...@lichtvoll.de
This may well be a driver issue, but I report it nonetheless, so you are aware
of it. I can report driver bug as well, if desired.
When I start a second Plasma session on VT8 using GLX with OpenGL 3.1 as
compositor backend + having DRI 3 enabled then after a short time when I switch
back to the original session at VT7 I just see a blank screen there. Brightness
is zero, so its really not just blank, but backlight is switched off. When I
switch to TTY1 then, it is almost black, brightness is very low. I can raise it
there, but VT7 is gone for good. In original bug report where I suspected
kscreen to be the culprit I reported what I tried to recover the session which
includes pressing a key,writing high brightness values to /sys/[path to
Intel/ACPI blacklight]/bl_power, xrandr --auto, vbetool dpms off, disabling
KScreen 2 + Powerdevil on both sessions, rm -r ~/.local/share/kscreen, masking
systemd backlight service, fiddling around with Solid brightness controls and
also kwin_x11 --replace.
I first thought this to be a bug in kscreen, but as it disappears when either
using XRender or disabling DRI 3, I think its a KWin compositor/GLX backend
*and/or* a driver issue:
Bug 359177 - blanks out original plasma session when I start a new a new plasma
session from it
Reproducible: Always
Steps to Reproduce:
1. Use Intel Sandybridge HD 3000 graphics (maybe fails with others as well,
don´t know)
2. Enable DRI 3.
3. Have two sessions with GLX + OpenGL 3.1 as compositing backend.
4. Start into first session.
5. Start second session.
6. Switch back to first session after a while with Ctrl-Alt-F7.
7. Maybe you need to switch between sessions several times.
Actually it also happens when just one of the sessions is a Plasma session with
GLX + OpenGL 3.1.
Actual Results:
One of the Plasma sessions or the Plasma session (if one one of them is a
Plasma session) has a black screen after switching to it. It never happens to
the non Plasma session like MATE or LXDE.
Expected Results:
Sessions continues to work just fine.
Working X11 configuration:
martin@merkaba:~> cat /etc/X11/xorg.conf.d/anzeige.conf
Section "Device"
Identifier "Grafikkern"
Driver "intel"
# Option "Backlight" "/dev/null"
Option "AccelMethod" "uxa"
# Option "AccelMethod" "sna"
# Option "TearFree" "true"
# Option "DRI" "3"
EndSection
Issue happens when you enable the Option DRI 3 line + GLX with OpenGL 3.1
compositing backend.
Acceleration method UXA is essential to prevent hard lockups (one of them
caused me a loss of public GPG key ring after a key signing at DebConf 2015).
It does not happen when using XRender as compositing backend or when DRI 3 line
is commented out.
kwin-x11 5.4.3 as packages with or without self-compiled KF5 + KDEPIM from Git
master:
martin@merkaba:~> LANG=C apt-cache policy kwin-x11
kwin-x11:
Installed: 4:5.4.3-1.1
Candidate: 4:5.4.3-1.1
Version table:
4:5.5.4-2 200
200 http://httpredir.debian.org/debian experimental/main amd64 Packages
*** 4:5.4.3-1.1 500
500 http://httpredir.debian.org/debian sid/main amd64 Packages
100 /var/lib/dpkg/status
I can try the experimental version, if its not compiled with Qt 5.6 (the build
for Debian experimental used Qt 5.6 which last time I tried was not yet
complete in experimental). I could even add kwin to kdesrc-build or so to build
it from master as well (just don´t want to have to build complete Plasma from
git due to space constraints on SSDs).
It happens on ThinkPad T520 with internal Full HD display second 23 inch Full
HD display.
# phoronix-test-suite system-info
Phoronix Test Suite v5.2.1
System Information
Hardware:
Processor: Intel Core i5-2520M @ 3.20GHz (4 Cores), Motherboard: LENOVO
42433WG, Chipset: Intel 2nd Generation Core Family DRAM, Memory: 16384MB, Disk:
300GB INTEL SSDSA2CW30 + 480GB Crucial_CT480M50, Graphics: Intel HD 3000
(1300MHz), Audio: Conexant CX20590, Monitor: P24T-7 LED, Network: Intel 82579LM
Gigabit Connection + Intel Centrino Advanced-N 6205
Software:
OS: Debian unstable, Kernel: 4.4.0-tp520-btrfstrim+ (x86_64), Desktop: KDE
Frameworks 5, Display Server: X Server 1.18.1, Display Driver: intel 2.99.917,
OpenGL: 3.3 Mesa 11.1.2, Compiler: GCC 5.3.1 20160220, File-System: btrfs,
Screen Resolution: 3840x1080
# apt list | egrep
"kwin-x11|xserver-xorg/|xserver-xorg-core/|xserver-xorg-video-intel|libdrm-intel|libgl1-mesa-dri"
| grep -v dbg
[…]
kwin-x11/unstable,now 4:5.4.3-1.1 amd64 [installiert]
libdrm-intel1/unstable,now 2.4.67-1 amd64 [Installiert,automatisch]
libgl1-mesa-dri/unstable,now 11.1.2-1 amd64 [installiert]
xserver-xorg/unstable,now 1:7.7+13 amd64 [installiert]
xserver-xorg-core/unstable,now 2:1.18.1-1 amd64 [Installiert,automatisch]
xserver-xorg-video-intel/unstable,now 2:2.99.917+git20160218-1 amd64
[installiert]
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