plasma freezes temporary (was: kwin crashes)

[orinoco]

Hello,

kwin crashes randomly here for some time. Even with the latest kernel.

journal: http://paste.siduction.org/20161029123923
inxi: http://paste.siduction.org/20161029123936

[musca]

Hello orinoco,
I'm not sure if this is a graphics issue or some qt-kde issue.

xserver-xorg-video-intel defaults to SNA (Sandybridge New Acceleration), but your cpu is older.
The package contains an example xorg.conf:

Code Select Expand

mkdir -p /etc/X11/xorg.conf.d/
cp /usr/share/doc/xserver-xorg-video-intel/xorg.conf  /etc/X11/xorg.conf.d/20-intel.conf

you can try to enable Universal Xcceleration Architecture (UXA), which is the predeccessor of SNA.

#Switch to intel with UXA
Section "Device"
    Identifier "Intel"
    Driver "intel"
    Option "AccelMethod" "uxa"
EndSection

A more modern option uses version 3 of the Direct Rendering Infrastructure.
Xorg still defaults to version 2.1.

    Option "DRI" "3"

greetings
musca

[orinoco]

Hello musca,

thanks for your advice. My xorg configuration now looks like this

Code Select Expand

Section "Device"
Identifier  "Intel Graphics"
Driver      "intel"
Option      "AccelMethod"     "uxa"
# Option      "AccelMethod"     "sna"
Option      "Backlight"       "intel_backlight" # use your backlight that works here
Option      "DRI"             "3"
BusID       "PCI:0:2:0"
EndSection

And I upgraded to the latest kernel today:

Code Select Expand

Linux tuxor2 4.8.5-towo.3-siduction-amd64 #1 SMP PREEMPT siduction 4.8-12 (2016-10-30) x86_64 GNU/Linux

Now kwin is not yelling about a crash anymore. Instead my Plasma Desktop freezes for about 10s. Meanwhile the journal says:

http://paste.siduction.org/20161030224721

 

[orinoco]

I can reproduce the crash with temporary freeze by running x64 from vice-package. One of five tries freezes my notebook permanently.

[orinoco]

Installed latest kernel 4.8.7-towo.1 and my notebook crashes during boot and freezes permanently. All I can find as a possible reason:


BUG: unable to handle kernel NULL pointer dereference at      (null)

[orinoco]

Oh dear...


After more than a year I found a workaround.


Adding video=SVIDEO-1:d to the kernel cmdline did the trick.