Bug 91747 - Ubuntu 15.04/Oibaf PPA - Unity bar not transparent
Summary: Ubuntu 15.04/Oibaf PPA - Unity bar not transparent
Alias: None
Product: Mesa
Classification: Unclassified
Component: Other (show other bugs)
Version: unspecified
Hardware: Other Linux (All)
: medium normal
Assignee: mesa-dev
QA Contact: mesa-dev
Depends on:
Reported: 2015-08-24 20:37 UTC by g9352248
Modified: 2015-09-02 21:00 UTC (History)
2 users (show)

See Also:
i915 platform:
i915 features:


Description g9352248 2015-08-24 20:37:57 UTC
Hi. Since June or July the Unity left bar and the menu is not transparent anymore. With the default open source drivers it works fine. I'm not sure if you have acknowledge of this bug but since it never gets fixed with the updates I decided to report it.

Comment 1 Benjamin Bellec 2015-08-26 16:41:16 UTC
What hardware do you use ?
Can you provide a screenshot before and after ?
Comment 2 Sinclair Yeh 2015-08-27 16:47:04 UTC
Can you provide output from glxinfo?
Comment 3 Brian Paul 2015-09-01 20:34:32 UTC
Thanks to Sinclair Yeh's detective work, it appears that the unity shell is disabling transparency when it finds "LLVM" in the GL_RENDERER string.

We've seen the same issue here with our latest VMware driver which includes the LLVM version in the GL_RENDERER string.  Sinclair found this code in the Unity shell in plugins/unityshell/src/unityshell.cpp:

  //In case of software rendering then enable lowgfx mode.
  std::string renderer = ANSI_TO_TCHAR(NUX_REINTERPRET_CAST(const char *, glGetString(GL_RENDERER)));

  if (renderer.find("Software Rasterizer") != std::string::npos ||
      renderer.find("Mesa X11") != std::string::npos ||
      renderer.find("LLVM") != std::string::npos ||
      renderer.find("on softpipe") != std::string::npos ||
      (getenv("UNITY_LOW_GFX_MODE") != NULL && atoi(getenv("UNITY_LOW_GFX_MODE")) == 1) ||

It looks like Marek added code in the r600 driver to include LLVM version info in the renderer string too:

commit a3723fb9e32ab114dcffcf74946def92647c5f03
Author: Marek Olšák <marek.olsak@amd.com>
Date:   Mon Jul 20 00:15:59 2015 +0200

    gallium/radeon: add DRM and LLVM version to the renderer string
So, if the reporter of this bug is using the r600 driver, that could explain things.  He mentions a change in June/July.

Clearly, the unity code above is pretty dodgy.  I'll see if we can report the issue upstream.

BTW, I tried pinging the bug reporter but email to g9352248@trbvm.com bounces.
Comment 4 Sinclair Yeh 2015-09-02 20:27:29 UTC
Done.  Created "old_gpg_id.txt" to show the previous ID, and also added new public key in my home directory.

Comment 5 Sinclair Yeh 2015-09-02 20:28:59 UTC
Ooops, wrong window.

Meant to say that I created a new Unity bug here:

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