** Changed in: mir
Status: Fix Committed => Fix Released
** Changed in: canonical-pocket-desktop
Status: Fix Committed => Fix Released
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This bug was fixed in the package mir - 0.18.0+16.04.20151216.1-0ubuntu1
---
mir (0.18.0+16.04.20151216.1-0ubuntu1) xenial; urgency=medium
[ Kevin DuBois ]
* New upstream release 0.18.0 (https://launchpad.net/mir/+milestone/0.18.0)
- ABI summary: Only servers need rebuilding;
** Also affects: mir (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1406725
Title:
Severe graphical corruption (mostly horizontal
** Changed in: canonical-pocket-desktop
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1406725
Title:
Severe graphical corruption (mostly
Fix committed into lp:mir at revision None, scheduled for release in
mir, milestone 0.18.0
** Changed in: mir
Status: In Progress => Fix Committed
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** Branch linked: lp:~kdub/mir/fix-1406725
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Title:
Severe graphical corruption (mostly horizontal streaks/lines) running
software
Testing the EGLSyncFence extensions with xmir still has some corruption.
Using these extensions stabilizes the mir_demo_client_flicker rendering.
So, its looking like there's two problems going on here.
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which is
So, we have two issues in this bug.
1) The majority of the xmir corruption was caused by calling
mir_buffer_stream_get_graphics_region() when xmir wanted to know the
buffer size. On android, this would call down into gralloc, and
invalidate/flush the cache when called. Its reasonable to just call
my spike branch that averts the problem is here, based on 0.17.1:
lp:~kdub/mir/0.17.1-fix-1406725
This branch doesnt have unit tests, and needs a bit more work on the new
internal interfaces, so I'll probably have to rework the branch to get it to
land in lp:mir.
** Branch linked:
The corruption appears on krillin too, so probably not a specific
chipset problem.
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Title:
Severe graphical corruption (mostly
After today's investigation, I think the cachelines that are appearing
as corruption are not from an lines that should have been invalidated,
but are the flushed lines from the next frame. IE, we're releasing the
buffer too early, and the flushed lines from the backbuffer render are
appearing as
glFinish and other flushing-commands (eg, eglClientWaitSyncKHR with the
flush bit) seem to be other alternatives that work, but those aren't
very good alternatives either.
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Just discovered something while working on bug 1513815
Basically, i was running pd on N4 set this env variable
SAL_USE_VCLPLUGIN=gen
which according to bjoern "forces LO to ignore the gtk plugin and uses the old
and trusty X11-only backend" ...figure this is true for all Xapps?
anyhow, i
A (bad) workaround is to map the buffer server-side, and then use
glTexImage2D (instead of glTargetTexture2D)
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Title:
Severe
External indication that adreno drivers have an issue flushing their
texture caches: https://codereview.chromium.org1241433003/
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Its seeming like the gpu-facing cache is the one that needs invalidation
from the GL/gralloc driver, but is not being flushed. This is a CPU/GPU
coordination issue, and the GPU-based scenarios all work through the
same cache and do not experience this problem. If we use overlays, this
is not an
I've been able to trace the calls down into the kernel, and it does look
like the kernel is flushing the cache at the appropriate time before
sending the buffer back to the client.
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** Changed in: mir
Assignee: (unassigned) => Kevin DuBois (kdub)
** Changed in: mir
Milestone: None => 0.18.0
** Changed in: mir
Status: Triaged => In Progress
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re:
Should we be concerned about this?...
no, these comments are a bit stale
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Title:
Severe graphical corruption (mostly horizontal
** Changed in: mir
Importance: High => Critical
** Changed in: xorg-server (Ubuntu)
Importance: High => Critical
** Also affects: canonical-pocket-desktop
Importance: Undecided
Status: New
** Changed in: canonical-pocket-desktop
Assignee: (unassigned) => kevin gunn
The problem looks like a cpu cache problem.
We call gralloc's unlock function, and digging through the gralloc code, it
looks like the internal native buffer flag that should trigger a cache flush is
behaving properly. Now seeing what I can find out in the kernel
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In case anyone is thinking it, switching Xmir to glamor to work around
this bug is not a good idea. We default to glamor in Xmir on desktop and
it's still too buggy (work in progress). The full list of issues for
Xmir+glamor is here: https://bugs.launchpad.net/ubuntu/+source/xorg-
Note to self: Need to check that this isn't actually just an
uninitialized alpha channel with RGBX (bug 1423462 and bug 1510386).
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** Summary changed:
- Severe graphical corruption running software clients (including Xmir) on
android
+ Severe graphical corruption (mostly horizontal streaks/lines) running
software clients (including Xmir) on android
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