On Tue, Feb 13, 2018 at 3:17 AM, Lukas Wunner <lukas@xxxxxxxxx> wrote: > On Mon, Feb 12, 2018 at 01:58:32PM -0500, Alex Deucher wrote: >> On Mon, Feb 12, 2018 at 4:45 AM, Lukas Wunner <lukas@xxxxxxxxx> wrote: >> > On Mon, Feb 12, 2018 at 09:03:26AM +0000, Mike Lothian wrote: >> >> On 12 February 2018 at 03:39, Lukas Wunner <lukas@xxxxxxxxx> wrote: >> >> > On Mon, Feb 12, 2018 at 12:35:51AM +0000, Mike Lothian wrote: >> >> > > I've not been able to reproduce the original problem you're trying to >> >> > > solve on amdgpu thats with or without your patch set and the above >> >> > > "trigger" too >> > >> > Okay the reason you're not seeing deadlocks is because the output poll >> > worker is not enabled. And the output poll worker is not enabled >> > because your discrete GPU doesn't have any outputs: >> > >> > [ 0.265568] [drm:dc_create] *ERROR* DC: Number of connectors is zero! >> > >> > The outputs are only polled if there are connectors which have the >> > DRM_CONNECTOR_POLL_CONNECT or DRM_CONNECTOR_POLL_DISCONNECT flag set. >> > And that only ever seems to be the case for VGA and DVI. >> > >> > We know based on bugzilla reports that hybrid graphics laptops do exist >> > which poll outputs with radeon and nouveau. If there are no laptops >> > supported by amdgpu whose discrete GPU has polled connectors, then >> > patch [5/5] would be unnecessary. That is for Alex to decide. >> >> Most hybrid laptops don't have display connectors on the dGPU and we >> only use polling on analog connectors, so you are not likely to run >> into this on recent laptops. That said, I don't know if there is some >> OEM system out there with a VGA port on the dGPU in a hybrid laptop. >> I guess another option is to just disable polling on hybrid laptops. > > If we don't know for sure, applying patch [5/5] would seem to be the > safest approach. (Assuming it doesn't break anything else.) I don't have any objections. I see no reason to leave out the amdgpu changes. Alex _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
