HELP: i915 does not OpenCL(ing) anymore

[mike_p_4]

Hi,

I use Ubuntu 14.04, no X Windows, I have installed the driver as for the installation guide, I have installed the OpenCL sdk as for the installation guide, I have installed the patched kernel 4.4 as for the installation guide, and everything worked a charm when I tested.

After the test of OpenCL, I did not use OpenCL for a while, and after few days, I tried again with several applications, and what I got is just hangs, nothing happens, apart from the cursor blinking. 

I checked if the kernel was still the patched one, and it is, I re-installed the modules, but still the same.

How do I troubleshoot the issue?  Can apt update and upgrade broke the OpenCL system?

I have attached a strace log file

Thanks

[Jeffrey_M_Intel1]

Yes, it is possible that components have been overwritten.  Some first steps you can try:

• Verify you've booted into the modified kernel, and that i915 is still loading.
• Make sure that there is only one libdrm on the system, and that it is the one shipped with the OpenCL driver. In cases like this I usually remove all versions of libdrm and re-install the OpenCL user-mode components (etc, usr, lib, opt, etc.)
• Check your install with the Platform/Device Capabilities Viewer Sample.  If you have a supported processor it should show that a CPU and GPU device are available.

This system analyzer script may help you diagnose: https://software.intel.com/en-us/articles/mss-sys-analyzer-linux

[mike_p_4]

Hi,

Thanks, yes I have already done all that, kernel is the same, i915 is loaded, I have re-installed the OpenCL components.

As for libdrm, it is the only installed (libdrm2).

As I said, it was working when I finished installing driver, patched kernel and sdk, but after few days when I tried again to run several OpenCL program, Platform/Device Capabilities Viewer Sample included, it hangs.

As for the sys analyzer, everything up to Media Server Studio Install is ok, then 

Media Server Studio Install:

OK user in video group

ERROR libva.so.1 not found. Check LD_LIBRARY_PATH contains '/usr/lib64;/usr/local/lib'

ERROR libva not loading Intel iHD

ERROR vainfo not reporting codec entry points

INFO i915 driver in use by Intel video adapter

ERROR no libdrm include  files. Are Intel components installed?

Component Smoke Tests:

ERROR no Media SDK include files. Are Intel components installed?

and then it hangs.

Also, when I try to re-install intel_sdk I receive the error:

terminate called after throwing an instance of 'std::out_of_range' 

what(): basic_string::replace

Aborted (core dumped)

Could you please check the strace file attached?

Thanks

[Jeffrey_M_Intel1]

The strace file you've attached is missing an open for /dev/dri/renderD###.  On your system, what do you see with ls /dev/dri?

Without being able to open that interface, your strace shows your app is also missing all the startup steps expected after that. 

In case you'd like to try again, I've updated the system analyzer to hopefully work better for OpenCL-only installs.  https://software.intel.com/en-us/articles/mss-sys-analyzer-linux

[mike_p_4]

Hi,

Thanks again, up to this day, I really do not know what upset the system.

I solved the issue by re-installing the OS.

[Jeffrey_M_Intel1]

Glad to hear your system works again!  For others who might run into similar issues, re-installing just the OpenCL SDK and runtime/driver components may also be effective.