[SOLVED] Display flickers upon quitting X

rh995 · 2015-06-11 04:07:29

When I take some action that quits the X server like logging out or switching tty, the display begins to jump around the screen. When I switch from a non-X tty to a different one, this problem does not appear. It only happens when I switch away from X, and affects all displays, not just X related ones once it starts. And once it starts, the only resolution I have been able to find is to reboot.

I am using LightDM and Xfce, but I don't expect that matters.

I am using a Lenovo ThinkPad x250, I have xf86-video-intel installed.
The output of lspci | grep -e VGA -e 3D is

00:02.0 VGA compatible controller: Intel Corporation Broadwell-U Integrated Graphics (rev 09)

Last edited by rh995 (2015-06-12 15:32:44)

Trilby · 2015-06-11 12:09:15

Please see this thread. Does your glitch sound like the horizontal sync issue I described in the last two posts?

I'm still hoping to track down this issue, but it seems the OP of that other thread has abandonded the topic. As you are also on a broadwell, it sounds like we may have the same issue which has also been reported for slackware:
http://www.linuxquestions.org/questions … 175542721/

rh995 · 2015-06-11 15:32:46

Yes i believe this is the same issue.

Trilby · 2015-06-11 18:55:49

Well ... at least were not alone

I am away from that hardware until tomorrow, so I haven't investigated much yet. But I plan to test the other acceleration methods (uxa and/or glamor instead of sna). If you want to beat me to that test, that'd be great.

rh995 · 2015-06-12 05:28:52

Looks like uxa works perfectly to fix this problem. I'll update this post once I've tried glamor.
Edit: glamor (assuming I enabled it correctly) does not work.

Last edited by rh995 (2015-06-12 05:32:02)

Trilby · 2015-06-12 11:33:21

Great, thanks for the results. This suggests (to me at least) that this is a temporary state that the kernel hackers will catch up with eventually. I had to use uxa for a while on my other intel graphics card, but as the kernel and/or graphics drivers caught up I could switch back to sna. The linux drivers are often playing catch up with the newest hardware, and the broadwell chips are pretty new on the scene. I'll update in a couple hours on whether this switch works for me too.

EDIT: I just confirmed uxa works fine on my Broadwell hardware too. It looks to me like this could be "solved."

Last edited by Trilby (2015-06-12 14:50:10)

bocki · 2015-06-14 17:37:57

What solved the problem for me was using

i915.enable_ips=0

to boot the kernel, which disables a specific powersaving feature that apparently causes this issue. There's also a bug report for this issue: https://bugs.freedesktop.org/show_bug.cgi?id=85583

Arch Linux

#1 2015-06-11 04:07:29

[SOLVED] Display flickers upon quitting X

#2 2015-06-11 12:09:15

Re: [SOLVED] Display flickers upon quitting X

#3 2015-06-11 15:32:46

Re: [SOLVED] Display flickers upon quitting X

#4 2015-06-11 18:55:49

Re: [SOLVED] Display flickers upon quitting X

#5 2015-06-12 05:28:52

Re: [SOLVED] Display flickers upon quitting X

#6 2015-06-12 11:33:21

Re: [SOLVED] Display flickers upon quitting X

#7 2015-06-14 17:37:57

Re: [SOLVED] Display flickers upon quitting X

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