It appears swrast has GL_MAX_TEXTURE_SIZE = 8192, so yes 2560x4 exceeds
that. Not sure why "Copy To Texture" isn't helping to fix it.
What if you only use three displays instead of four? Does it work then?
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Hi, has anyone tried this on 16.04 with the software rasterizer
(swrast_dri.so)?
I'm seeing the same crash with with four 2560x1600 displays on Compiz
0.9.12.2.
The crash happens in libopengl.so when it tries to deference "priv"
const GLTexture::Matrix &
GLTexture::matrix () const
{
Crashing fixed in Ubuntu 15.10 according to comment #24.
** Changed in: compiz
Importance: Undecided => Medium
** Changed in: compiz
Status: Triaged => Fix Released
** Changed in: compiz (Ubuntu)
Status: Triaged => Fix Released
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Seems my respons was lost: i gave a reply to the emailalert, but it
didn't make it to launchpad i see.
So here it is once more;
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So, nice to have finally explained this issue, as far im concerned you can set
this bug to resolved. It gets handled nicely on a new install of 15.10 and
So i tried a new clean install with 15.10 and now it works very nicely!
I'm suspecting the upgrades from 14.10/15.04 or the troubleshooting
steps have broken something.
I also got a reason why the 2x4k and 1x2k resolution does not work;
"exceeds 3D hardware limit (8191, 8192)"
I made a screenshot
That hardware limit is what the "Copy to texture" plugin was designed to
overcome, IIRC.
The limit is literally just the maximum size of a texture your
GPU/driver can handle. If the OS/display server is clever, it should be
able to manage textures within that limit without also limiting the size
Also, 2x4k should fit within your 8192 limit. If you move or remove the
2k monitor and just place it logically above/below the 2x4k displays
then you won't hit the problem. 'arandr' should help with that, if not
the usual "System Settings > Screen Display" and drag the 2k display to
a new location
** Summary changed:
- connecting 2x 4k screens on a Dell XPS12 (9Q33): compiz crashed with SIGSEGV
in GLTexture::matrix()
+ connecting 2x 4k screens on a Dell XPS12 (9Q33): compiz crashed with SIGSEGV
in GLTexture::matrix() from GLScreen::glPaintCompositedOutput
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As part of the big bug clear up for 16.04 LTS I am marking this bug as Wont Fix.
These types of crasher are better handled by https://errors.ubuntu.com/ which
can collate similar crash reports to help us identify persitent bugs rather
than one-off crashes.
Sorry we are not able to help with this
Please ignore that last comment. Seems there is a bug in the script.
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https://bugs.launchpad.net/bugs/1459613
Title:
connecting 2x 4k screens on a Dell XPS12 (9Q33): compiz crashed
No Problem, in the light of a general cleanup it's good to just close it
to see if there are any reactions, especially when there is just one
person (=me) is reporting the bug.
Just let me know if i can test stuff. Soon i'll have another hardware
laptop to test it with, I will try to reproduce it
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