Bug 91472 - [sna] screen flashes with sna acceleration
Summary: [sna] screen flashes with sna acceleration
Status: RESOLVED FIXED
Alias: None
Product: xorg
Classification: Unclassified
Component: Driver/intel (show other bugs)
Version: unspecified
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: Chris Wilson
QA Contact: Intel GFX Bugs mailing list
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2015-07-27 10:47 UTC by evilsign
Modified: 2015-07-27 10:51 UTC (History)
1 user (show)

See Also:
i915 platform:
i915 features:

Attachments

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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