https://bugs.kde.org/show_bug.cgi?id=388712
Bug ID: 388712
Summary: Highly unstable default Intel HD driver
xorg-video-intel-modesetting
Product: neon
Version: unspecified
Platform: Neon Packages
OS: Linux
Status: UNCONFIRMED
Severity: crash
Priority: NOR
Component: Packages User Edition
Assignee: neon-b...@kde.org
Reporter: ma...@free.fr
CC: j...@jriddell.org, neon-b...@kde.org, sit...@kde.org
Target Milestone: ---
Hi !
Using a Kaby Lake machine (Intel HD 630), Neon (user) uses by default the
xserver-xorg-video-intel-modesetting driver for Intel HD Graphics. It was I
think backported by the Neon team to get better performance than the default
Ubuntu HD graphics driver.
However, I figured out this driver would make my machine EXTREMELY unstable :
several X crashes per day.
On the same machine I had no crash at all within a year with an Nvidia card. I
switched back to the Ubuntu driver xserver-xorg-video-intel-hwe which is based
on a March GIT version (contrary to the Neon default one which is from the
September GIT version) and have a perfectly stable desktop.
Please note that before completely freezing the X server, strange phenomenoms
begin to appear that could make one think there is something wrong with kwin.
(black flickering, windows resizing themselves or not reacting properly to
events). But as it only happens with this specific driver and leads to a
complete freeze, I think it's way lower in the stack.
I also run Neon on other machines using other Intel HD graphics (HD 3000 or
4000). They do not seem to suffer from the instability.
Do other people use this driver with a Kaby Lake Intel Graphics ? Would you
consider switching back to a safer / more supported driver by default ?
NOTE 1 : I made also tons of tests : clean install, X edgers PPA, updated Intel
microcode, etc. No difference at all. The crash even occurs when just using
Thunderbird / Firefox with no special configuration (no accelerated layers).
OIn the contrary, with the HWE driver, I can stress the GPU a lot (Steam games
etc) and get no crash.
NOTE 2 : ALL intel drivers (the Neon native modesetting of the Ubuntu HWE) ALSO
suffer from slow performance, even when compositing is disabled, in many games.
Phenomenon that doesn't occur under the Wayland session where all simple games
are fast & smooth. I didn't test the stability under Neon but as I guess it
doesn't use the X driver, it's not supposed to crash :-)
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