DRM IOCTLS come regularly(every minute) still even after screen off

[Quan, Evan]

[Public]



> -----Original Message-----
> From: Michel Dänzer <michel at daenzer.net>
> Sent: Thursday, September 16, 2021 4:12 PM
> To: Christian König <ckoenig.leichtzumerken at gmail.com>; Quan, Evan
> <Evan.Quan at amd.com>
> Cc: Deucher, Alexander <Alexander.Deucher at amd.com>; Koenig, Christian
> <Christian.Koenig at amd.com>; 'amd-gfx at lists.freedesktop.org' <amd-
> gfx at lists.freedesktop.org>
> Subject: Re: DRM IOCTLS come regularly(every minute) still even after screen
> off
> 
> On 2021-09-16 08:27, Christian König wrote:
> > Good morning,
> >
> > for the background I advised to contact you Michel since we couldn't find
> an explanation.
> >
> > Alex explanation might be correct, but the CS seems to come from the X
> server and is always roughly 60 seconds after going into power save.
> >
> > Any idea what that could be?
> 
> For the DRM_IOCTL_MODE_* ioctls, attaching gdb to Xorg and setting a
> breakpoint on drmIoctl should show where they're coming from.
> 
> The AMDGPU_CS ioctls are probably from glamor calling OpenGL, most likely
> for X11 drawing protocol requests. Note that in this case drmIoctl/ioctl will
> likely be called from a separate thread. Pierre / Marek should be able to help
> you find out where the OpenGL calls are coming from.
> 
> 
> In general, Xorg only ever does anything in response to:
> 
> * X11 protocol requests, i.e. on behalf of clients.
> * Input events, i.e. on behalf of the user.
> * Other kernel events, e.g. hotplug events.
> 
Thanks for sharing these.
> 
> FWIW, with only xfwm4 & xterm running on Xorg, I'm not seeing any drmIoctl
> calls during DPMS off. So the ioctls you're seeing are most likely triggered by
> clients.
> 
Got it. Thanks!

Evan
> 
> --
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