Bug 102017

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Screenshot from game

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Screenshot from menu

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Dump from glxinfo

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Dump from lspci (gfx only)

Can you also run the game from the command line and see whether there are any error messages, specifically whether you get any messages saying something like 

  r600_shader_select - Failed to build shader variant (type=1) -1
  r600_shader.c:183 r600_pipe_shader_create - translation from TGSI failed !

In this case it might be a duplicate of 

  https://bugs.freedesktop.org/show_bug.cgi?id=99349

Best, 
Gert

This game always worked fine for me with an HD 5770, and is still OK with Oibaf PPA. It was also OK with an HD 4850.
The problem might be specific to Cayman.

Can you try running the game with the environement variable "R600_DEBUG=nosb"?

You might also want to try with UNITY_DISABLE_GRAPHICS_DRIVER_WORKAROUNDS=yes - Cities Skylines has broken in the past due to bugs in Unity (which were fixed in a newer version of the engine, but the game hadn't updated yet).

@Kenneth UNITY_DISABLE_GRAPHICS_DRIVER_WORKAROUNDS=yes didn't help unfortunately. (I tried it before IIRC).

@MWATTT R600_DEBUG=nosb didn't change anything as well.

@Gert The game requires Steam, so I cannot run it 'fully' from command line. I run 'steam' from the terminal and then start the game inside Steam. IIRC for other games it used to print game-related messages, but I cannot guarantee that the output isn't redirected in some way. Anyway I cannot see any messages that could help with the problem.

I'm having the same issue, with Ubuntu 17.04 stock mesa and r600 (HD 6870)

It looks to me like an issue with textures not being drawn; Everything is displayed with nice reflective surfaces. In the in-game data views (where most surfaces are blank), the colours are largely fine, but there are some glitches in details (e.g. water, road bridges). 

I've just upgraded from Ubuntu 16.04 LTS. Before the upgrade, everything worked beautifully with the same game version.

Created attachment 133678 [details]
in-game screenshot: blank surfaces

Created attachment 133679 [details]
in-game data view has correct colours

(In reply to Thomas Jollans from comment #9)
> I'm having the same issue, with Ubuntu 17.04 stock mesa and r600 (HD 6870)
> 
> It looks to me like an issue with textures not being drawn; Everything is
> displayed with nice reflective surfaces. In the in-game data views (where
> most surfaces are blank), the colours are largely fine, but there are some
> glitches in details (e.g. water, road bridges). 
> 
> I've just upgraded from Ubuntu 16.04 LTS. Before the upgrade, everything
> worked beautifully with the same game version.

If you can figure out which version of Mesa is used by 16.04 LTS and 17.04, I would suggest doing a git bisect to find the change that broke things. Bisecting the commit will greatly increase the chance of this being fixed.

Feel free to ask for help on the #dri-devel freenode channel if you need assistance.

I definitively can't reproduce this bug, even with Ubuntu 17.04 stock mesa. It might be specific to some high end cards. Which game settings do you use?

Maybe you're missing libtxc_dxtn? According to the glxinfo the dxt* texture compression extensions are not available.

@Gert - great catch! It seems that Steam provided via official Ubuntu/Canonical repos depends on libtxc-dxtn-s2tc:i386 only so one need to install libtxc-dxtn-s2tc:amd64 manually. See https://bugs.launchpad.net/ubuntu/+source/steam/+bug/1684755, https://github.com/ValveSoftware/Dota-2/issues/1213 for some more details.

After installing amd64 package the game appears to look fine. I suppose that we can close this issue. (?)

Hopefully we can enable this but default soon, as far as I can tell the patent only has just over a month til it expires \o/

Thanks everyone for looking into this. I can confirm that the issue was a missing libtxc_dxtn for me too.