Bug 91472

Summary:	[sna] screen flashes with sna acceleration
Product:	xorg	Reporter:	evilsign
Component:	Driver/intel	Assignee:	Chris Wilson <chris>
Status:	RESOLVED FIXED	QA Contact:	Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity:	normal
Priority:	medium	CC:	evilsign
Version:	unspecified
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description evilsign 2015-07-27 10:47:49 UTC

Thinkpad X1 carbon 2015 model.
Archlinux 
Xorg 1.17.2 
xf86-video-intel 2.99.917+381+g5772556
VGA compatible controller: Intel Corporation Broadwell-U Integrated Graphics (rev 09)


When configured Xorg with sna AccelMethod,Screen display flashes.
The stuff on monitor moves veryfast from left to right.
There is a screenshot :
http://www.hacksign.cn/612022797.jpg
not only GUI flashes, all tty flash as above situation as well.

It is ok,when configured with uxa AccelMethod, but this accelmethod caused system slow down when drawingthings on screen.

Comment 1 evilsign 2015-07-27 10:51:44 UTC

Well,this may not happy on a fresh new start.
I use lightdm-gtk-greeter as my login manager,This situation always happen when I login into my system and then lock screen with 'dm-tool lock' command.

Comment 2 Chris Wilson 2015-07-27 10:51:59 UTC

It's a kernel bug fixed in 4.2; use i915.enable_ips=0 to workaround for now.

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