Hi Christian, please provide more information about how you got this message. What application did you run, on which hardware ?

I use Open Suse Leap 42.1 as OS.
The two graphic card are managed with bumblebee.
The error occurs when I enter the following 
command and run the virtual machine.

vblank_mode=0 primusrun vmware

GLib-GIO-Message: Using the 'memory' GSettings backend.  Your settings will not be saved or shared with other applications.
ATTENTION: default value of option vblank_mode overridden by environment.
ATTENTION: default value of option vblank_mode overridden by environment.
Mesa 11.1.2 implementation error: bad format MESA_FORMAT_Z24_UNORM_X8_UINT in _mesa_unpack_uint_24_8_depth_stencil_row
Please report at https://bugs.freedesktop.org/enter_bug.cgi?product=Mesa

(In reply to Christian Rauscher from comment #2)
> I use Open Suse Leap 42.1 as OS.
> The two graphic cards are managed with bumblebee.
> The error occurs when I enter the following 
> command and run the virtual machine.
> 
> vblank_mode=0 primusrun vmware
> 
> GLib-GIO-Message: Using the 'memory' GSettings backend.  Your settings will
> not be saved or shared with other applications.
> ATTENTION: default value of option vblank_mode overridden by environment.
> ATTENTION: default value of option vblank_mode overridden by environment.
> Mesa 11.1.2 implementation error: bad format MESA_FORMAT_Z24_UNORM_X8_UINT
> in _mesa_unpack_uint_24_8_depth_stencil_row
> Please report at https://bugs.freedesktop.org/enter_bug.cgi?product=Mesa

*** This bug has been marked as a duplicate of bug 2 ***

Software:
KDE-Plasma-Version: 5.5.5
Qt-Version: 5.5.1
OS: openSUSE Leap 42.1

Hardware:
Processor: Intel Core i7-3630QM CPU
Speicher: 32GB DDR3

Graphic-Chips: 
Nvidia Optimus
Nvidia Geforce GT 650M 2GB RAM
Intel HD Graphics 4000

GL_RENDERER   = Mesa DRI Intel(R) Haswell Mobile 
GL_VERSION    = 3.0 Mesa 17.0.1
GL_VENDOR     = Intel Open Source Technology Center

I get that error when running Cemu 1.7.2c (Wii U emulator) with Wine. At least Mario Kart 8 and Splatoon can produce that issue.

Seems to be i965 related, so changing component to dri/i965.

Guys, can anyone provide a small test app that reproduces the problem ? Alternatively doing an apitrace [1], for other devs to use, should help.

Note that the file will be too big for Bugzilla, so please xz it and add a link to google drive [other].

[1] https://github.com/apitrace/apitrace
The wiki has various instructions.

Could someone please provide an apitrace that exhibits the issue?  It should be fairly easy to trace something like Cemu.

Created attachment 130294 [details]
Cemu 1.6.4 with Super Mario Maker - Mesa 17.0.1

Sorry it took "so long". I tried it two days ago but Cemu crashed the whole time because of some weird error I cannot decipher ("Unhandled exception: page fault on read access to 0x00000020 in 64-bit code (0x00000001400d6db8)"). Sidenote: This isn't the newest Cemu version (1.7.2) but an older one (1.6.4) as the newer one crashes now (see above). I changed some things with Nvidia & non-Nvidia since I wrote that comment so maybe that's because some versions crash.

Created attachment 130338 [details] [review]
Proposed patch (git am)

Ouch, we just didn't handle depth-only in the ClearTexture path at all.  This patch fixes the _mesa_problem() - does it work okay?

Luca, Christian, would one of you be able to test the patch I attached?

@Kenneth: I can just say, that the error in the console is gone but can't confirm anything as the Cemu window is still just black and doesn't display anything.

The error messages dissapeared. 
As cemus starts on my modified mesa version, I'm able to be positive on this.

Here a screenshoot with both i965 and radeonsi 

http://imgur.com/a/isAqP

I forgot to specify that the patch did not garble display, it's the actual behaviour on i965 with haswell or skylake igp on my mesa version.

New picture:
http://imgur.com/a/p7ggm

*** Bug 103966 has been marked as a duplicate of this bug. ***

Fixed in master by:

commit 8705ed13e3114ad994dbd46387576749f54fc7eb
Author: Kenneth Graunke <kenneth@whitecape.org>
Date:   Tue Mar 21 00:30:06 2017 -0700

    meta: Fix ClearTexture with GL_DEPTH_COMPONENT.
    
    We only handled unpacking for GL_DEPTH_STENCIL formats.
    
    Cemu was hitting _mesa_problem() for an unsupported format in
    _mesa_unpack_float_32_uint_24_8_depth_stencil_row(), because the
    format was depth-only, rather than depth-stencil.
    
    Cc: "13.0 12.0" <mesa-stable@lists.freedesktop.org>
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94739
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=103966
    Reviewed-by: Tapani Pälli <tapani.palli@intel.com>