Resizing windows produces artefacts after latest update

[Amr Ibrahim]

After updating to 1:7.9.0-0ubuntu1~16.04.1, I noticed that when I resize windows, they produce artefacts. See the attached screencast.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xserver-xorg-video-radeon-hwe-16.04 1:7.9.0-0ubuntu1~16.04.1
ProcVersionSignature: Ubuntu 4.10.0-28.32~16.04.2-generic 4.10.17
Uname: Linux 4.10.0-28-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Aug 1 13:22:33 2017
InstallationDate: Installed on 2017-06-21 (40 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
SourcePackage: xserver-xorg-video-ati-hwe-16.04
UpgradeStatus: No upgrade log present (probably fresh install)

[Amr Ibrahim (amribrahim1987)]

Created attachment 133192
GTK3 tooltips are corrupted

After updating to Radeon 7.9.0 in Ubuntu 16.04.3, I noticed that all GTK3 tooltips are corrupted. See the attached screencast. Other tooltips are not affected.

[Amr Ibrahim (amribrahim1987)]

Created attachment 133193
Xorg log

[Michel Dänzer (michel-daenzer)]

Does

 Option "AccelMethod" "EXA"

in /etc/X11/xorg.conf avoid the problem? If not, please attach the corresponding Xorg log file.

[Amr Ibrahim (amribrahim1987)]

I don't have this file /etc/X11/xorg.conf.

Please tell me what the content of it would be so I can create a new one.

[Amr Ibrahim (amribrahim1987)]

Michel, yes, adding that option fixes the tooltips problem.

It also fixes another bug about artefacts when resizing windows. I attached a screencast. Downstream https://launchpad.net/bugs/1707893

[Amr Ibrahim (amribrahim1987)]

Created attachment 133215
Xorg log after Option "AccelMethod" "EXA"

[Amr Ibrahim (amribrahim1987)]

Created attachment 133217
Resizing windows artefacts before Option "AccelMethod" "EXA"

This screencast is before the Option "AccelMethod" "EXA". After applying the option, the artefacts are gone.

[Michel Dänzer (michel-daenzer)]

Please try

 Driver "modesetting"

in xorg.conf and attach the corresponding Xorg log file. Does either of these problems happen in that case as well?

[Amr Ibrahim (amribrahim1987)]

Adding Driver "modesetting" made the two problems disappear by making compiz (unity7) go into low graphics mode. Effects and animations are gone. Compiz was using 50% CPU.

[Amr Ibrahim (amribrahim1987)]

Created attachment 133224
Xorg log after Driver "modesetting"

[Amr Ibrahim (amribrahim1987)]

The whole desktop is much slower after Driver "modesetting". Playing small videos in Totem is slow. Playing big videos crashes the session and brings me back to the login screen. Compiz and Totem together use 100% CPU for switching, moving windows and playing videos.

[Michel Dänzer (michel-daenzer)]

Ah, you also need to comment out Option "AccelMethod" for testing the modesetting driver.

[Amr Ibrahim (amribrahim1987)]

Created attachment 133225
Xorg log after Driver "modesetting" and without Option "AccelMethod"

[Amr Ibrahim (amribrahim1987)]

OK, the driver modesetting brings back the two problems.

[Michel Dänzer (michel-daenzer)]

Given that there haven't seemed to be any similar reports with GCN hardware, I suspect the tooltip issue is a Mesa r600 driver bug. E.g.

https://cgit.freedesktop.org/mesa/mesa/commit/src/gallium/drivers/r600?id=e6d7937b86d8f3c7e0605741de8721caf991af05

or something like that might explain it.

The window resizing issue is probably separate and should be tracked separately.

[Amr Ibrahim (amribrahim1987)]

Thanks Michel. Should I open a new bug about the window resizing issue?

[Michel Dänzer (michel-daenzer)]

Does the bug summary change mean you've confirmed that the problem doesn't happen with an older version of Mesa? If so, which version?

[Amr Ibrahim (amribrahim1987)]

OK, I have made a mistake and tested some combinations.

radeon 7.9.0 + mesa 12.0.6 is buggy
radeon 7.9.0 + mesa 17.0.7 is buggy
radeon 7.7.0 + mesa 12.0.6 is not buggy
radeon 7.7.0 + mesa 17.0.7 is not buggy

So, I think the bug is still in radeon 7.9.0.

[Michel Dänzer (michel-daenzer)]

Did you test 7.7.0 with

 Option "AccelMethod" "glamor"

? The default switched from EXA to glamor between 7.7.0 and 7.9.0.

[Amr Ibrahim (amribrahim1987)]

Created attachment 133881
Xorg log after Option "AccelMethod" "glamor"

7.7.0 with Option "AccelMethod" "glamor" is buggy.

[Ilia Mirkin (imirkin)]

One quick drive-by observation... does EXA support DRI3? If not, does disabling DRI3 with glamor "fix" things?

[Michel Dänzer (michel-daenzer)]

(In reply to Ilia Mirkin from comment #20)
> does EXA support DRI3?

DRI3 is disabled by default with EXA due to bug 95475 (probably unfixable with the current EXA design).

> If not, does disabling DRI3 with glamor "fix" things?

Good question; checking the attachment from comment 19 shows that DRI3 is disabled, so the answer is no.

[Gitlab-migration (gitlab-migration)]

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You can subscribe and participate further through the new bug through this link to our GitLab instance: https://gitlab.freedesktop.org/mesa/mesa/issues/608.