Bug 96970

Summary:	Graphics artifacts with recent SNA driver
Product:	xorg	Reporter:	James Miller <bladeon>
Component:	Driver/intel	Assignee:	Chris Wilson <chris>
Status:	RESOLVED MOVED	QA Contact:	Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity:	normal
Priority:	medium	CC:	a.sloman
Version:	git
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description James Miller 2016-07-18 05:50:04 UTC

A recent version of the SNA driver is causing strange drawing issues on my machine. Areas of the screen will either fail to update, or switch between the correct display and an old version. In both cases, doing something to trigger a redraw in the affected tends to fix it, however it doesn't always, it seems that "smaller" changes don't necessarily fix it. For example, scrolling through logs on the terminal will cause blocks containing the timestamps to stop updating until more than a few characters change within the block.

I have the issue in the driver built from commit 26f8ab5 but not with a508b11.

I am running ArchLinux on a Lenovo ThinkPad T540p. I have an Intel i7 Haswell chip and am using the integrated graphics card.

My Xorg configuration is just set to use SNA and has TearFree enabled. Using UXA fixes the problem, but causes tearing issues (that have always been present). I am also using Bumblebee.

Comment 1 Max 2016-08-24 06:27:06 UTC

Same for me.
Archlinux, Lenovo ThinkPad 440, Intel(R) Core(TM) i5-4210U CPU @ 1.70GHz
Had to switch to UXA.

Comment 2 James Miller 2017-04-04 23:24:20 UTC

Any updates on this issue? It's been almost a year and I haven't seen anything about it. Has this been fixed? I can't really update my driver with this bug in place.

Comment 3 Artem Astafyev 2017-04-05 16:06:58 UTC

Please try the latest sources. I've just installed xserver-xorg-video-intel-2.99.917+git20170309 on Ubuntu and all issues with sna are gone. With old driver xserver-xorg-video-intel-2.99.917+git20160706 it was impossible to work because of these artifacts and I had to switch to uxa acceleration.

Comment 4 Artem Astafyev 2017-04-05 16:10:09 UTC

*** Bug 98108 has been marked as a duplicate of this bug. ***

Comment 5 Martin Peres 2019-11-27 13:45:26 UTC

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