[Mesa-users] How to completely disable 3D hardware acceleration

[Brian Paul]

On 06/12/2017 01:57 AM, R. Diez wrote:
> Hi all:
>
> Can someone tell me how to disable 3D hardware acceleration completely? I guess "glxinfo | grep rendering" would then show "direct rendering: No".
>
> I want to always use software 3D rendering, because my PC is hanging and I suspect it is the 3D hardware rendering. 2D acceleration seems to work fine, so I would like to keep it if possible.
>
> Disabling the desktop compositor in Xfce reduces the problems significantly, but not completely, because some applications use 3D acceleration on their own.

You could rm or mv the actual driver file.  Look in 
/usr/lib/x86_64-linux-gnu/dri/ (or i386-linux-gnu/dri/) for r600_dri.so 
(for example) and rm/mv the file.

You can use LIBGL_DEBUG=verbose to see exactly which driver file is 
being loaded with glxinfo.

-Brian



> I am aware that you can set LIBGL_ALWAYS_SOFTWARE=1 in the environment, but I am looking for a system-wide solution for all users that cannot be easily forgotten or overridden.
>
> I found a tool called driconf, and I tried disabling 3D acceleration with it, but it seems to have no effect.
>
> I am using Xubuntu 16.04.2 LTS:
>
>
> $ uname -a
> Linux rdiez3 4.8.0-54-generic #57~16.04.1-Ubuntu SMP Wed May 24 16:22:28 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
>
> X.Org X Server is version 1.18.4
>
> OpenGL version string: 3.0 Mesa 12.0.6
>
> The first PC I want to test this solution uses the Intel i965 driver, and the one with the freezing problem has this graphics hardware and software:
>
> VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] RS780L [Radeon 3000] [1002:9616]
> Subsystem: Gigabyte Technology Co., Ltd RS780L [Radeon 3000] [1458:d000]
> Kernel driver in use: radeon
> Kernel modules: radeon
>
> Please copy me on the replies, as I am not (really) subscribed to this list.
>
> Many thanks in advance,
>        rdiez
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