[Mesa-users] Bugs after upgrade

[Brian Paul]

On 09/01/2013 01:51 PM, John Z. wrote:
> Hello,
>      dunno if this is the proper place to ask this kind of question, but
> before I file a bug, I'd like to actually clarify if it IS a bug.
>
>      So - after upgrading my system (Arch), the rendering in my pet
> project is pretty broken. I am pretty certain I didn't use any
> driver-specific or undefined behaviors, and I think the issue has to do
> with stencil function which I use mainly to optimize deferred rendering
> and isolate geometry and skybox.
> I noticed that Changelog has some changes regarding access of reference
> value for stencil tests.
>
>      I can describe the errors, but I think its best you see for yourself:
> Before update -
> https://dl.dropboxusercontent.com/u/80655/possible_bugs/Screenshot%20from%202013-08-16%2011%3A21%3A54.png
>
>
> After update -
> https://dl.dropboxusercontent.com/u/80655/possible_bugs/Screenshot%20from%202013-08-31%2018%3A02%3A21.png
>
>
>
> Shortly: skybox is missing, SSAO is inverted (?), and black artifacts
> make it difficult to figure out if errors have to do with spotlights or
> some weird stenciling/depth tests again.
> My package manager log explained how to configure X11 to fall back to
> UXA acceleration instead of new SNA - but that didn't fix anything either.
>
> I can't stress enough that I _did not_ change any rendering code in the
> meantime, as a matter of fact I checked out version from 2013/08/16 and
> tried it out, and ran into same issues; therefore, I am fairly certain
> that either a bug was introduced, or I was (unknowingly) using
> driver-specific behavior.
> That being said, I am not using any obscure GL features, only very
> standard things (floating point textures, DepthStencil fb attachments
> and such).
>
>
> My working machine is a laptop with Intel's GPU, lspci:
>
> 00:00.0 Host bridge: Intel Corporation Core Processor DRAM Controller
> (rev 12)
> 00:02.0 VGA compatible controller: Intel Corporation Core Processor
> Integrated Graphics Controller (rev 12)
> 00:16.0 Communication controller: Intel Corporation 5 Series/3400 Series
> Chipset HECI Controller (rev 06)
> 00:1a.0 USB controller: Intel Corporation 5 Series/3400 Series Chipset
> USB2 Enhanced Host Controller (rev 06)
> 00:1b.0 Audio device: Intel Corporation 5 Series/3400 Series Chipset
> High Definition Audio (rev 06)
> 00:1c.0 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI
> Express Root Port 1 (rev 06)
> 00:1c.1 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI
> Express Root Port 2 (rev 06)
> 00:1c.2 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI
> Express Root Port 3 (rev 06)
> 00:1c.4 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI
> Express Root Port 5 (rev 06)
> 00:1d.0 USB controller: Intel Corporation 5 Series/3400 Series Chipset
> USB2 Enhanced Host Controller (rev 06)
> 00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev a6)
> 00:1f.0 ISA bridge: Intel Corporation Mobile 5 Series Chipset LPC
> Interface Controller (rev 06)
> 00:1f.2 SATA controller: Intel Corporation 5 Series/3400 Series Chipset
> 4 port SATA AHCI Controller (rev 06)
> 00:1f.3 SMBus: Intel Corporation 5 Series/3400 Series Chipset SMBus
> Controller (rev 06)
> 00:1f.6 Signal processing controller: Intel Corporation 5 Series/3400
> Series Chipset Thermal Subsystem (rev 06)
> 02:00.0 Network controller: Qualcomm Atheros AR9285 Wireless Network
> Adapter (PCI-Express) (rev 01)
> 05:00.0 Ethernet controller: Qualcomm Atheros AR8131 Gigabit Ethernet
> (rev c0)
> 3f:00.0 Host bridge: Intel Corporation Core Processor QuickPath
> Architecture Generic Non-core Registers (rev 02)
> 3f:00.1 Host bridge: Intel Corporation Core Processor QuickPath
> Architecture System Address Decoder (rev 02)
> 3f:02.0 Host bridge: Intel Corporation Core Processor QPI Link 0 (rev 02)
> 3f:02.1 Host bridge: Intel Corporation Core Processor QPI Physical 0
> (rev 02)
> 3f:02.2 Host bridge: Intel Corporation Core Processor Reserved (rev 02)
> 3f:02.3 Host bridge: Intel Corporation Core Processor Reserved (rev 02)
>
>
>
> If anybody can give me a shout regarding this, I'd be most thankful.
> Cheers.

I suggest that you file a bug report.  Please indicate the Mesa version 
before and after.  And include the output of glxinfo.  Hopefully, one of 
the Intel developers will be able to investigate.

-Brian