GPU hang trying to run OpenCL kernels on x86_64

[Luís Mendes]

Hi Michel,

So summarizing with Linux kernel 4.17-rc6 on Ubuntu 18.04 using AMD RX
460/RX 550 I am not able to enter X.
The same system with AMD Radeon R7 240 not only enters X as also runs the
OpenCL kernel that RX 460 / RX 550 are unable to run for all the kernels
that I have tested.
Could this also be a Mesa issue, regarding OpenCL on RX 460?

Regards,
Luís

On Thu, May 24, 2018 at 9:55 AM, Luís Mendes <luis.p.mendes at gmail.com>
wrote:

> Hi Michel,
>
> I will have to check previous rc releases of 4.17 to see if it wasn't
> already happening, before trying any possible git bisect.
> As an update I can say that an AMD Radeon R7 240 works fine on the same
> system with the same kernel and I am able to run the OpenCL kernels, that I
> couldn't with RX 460/RX 550.
>
> Regards,
> Luís
>
> On Thu, May 24, 2018 at 9:30 AM, Michel Dänzer <michel at daenzer.net> wrote:
>
>> On 2018-05-24 12:06 AM, Luís Mendes wrote:
>> > I've tried Linux 4.17-rc6 with Ubuntu 18.04 on Tyan S7002 and I am not
>> even
>> > able see lightdm/gdm3 as system hangs when starting X.
>> > Having SR-IOV enabled or disabled makes no difference.
>> > Tested with AMD RX 460.
>> > When X is supposed to start the system hangs and only a rectangular
>> region
>> > on the top left corner screen remains with console text messages from
>> the
>> > boot process while the remaining of the screen is just black. I am
>> unable
>> > to do anything with the keyboard, switching to console does not work,
>> > ctrl-alt-del also doesn't work. I've to do a cold reset.
>>
>> Can you isolate which change introduced this new issue with git bisect?
>>
>>
>> --
>> Earthling Michel Dänzer               |               http://www.amd.com
>> Libre software enthusiast             |             Mesa and X developer
>>
>
>
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