On 9/8/22 03:07, Jonathan Gray wrote:
Index: sys/dev/pci/drm/i915/i915_drv.c =================================================================== RCS file: /cvs/src/sys/dev/pci/drm/i915/i915_drv.c,v retrieving revision 1.143 diff -u -p -r1.143 i915_drv.c --- sys/dev/pci/drm/i915/i915_drv.c 30 Jul 2022 14:15:20 -0000 1.143 +++ sys/dev/pci/drm/i915/i915_drv.c 8 Sep 2022 00:33:22 -0000 @@ -2410,6 +2410,11 @@ inteldrm_attach(struct device *parent, s dev_priv->id = id; info = (struct intel_device_info *)id->driver_data;+ /* Device parameters start as a copy of module parameters. */+ i915_params_copy(&dev_priv->params, &i915_modparams); + dev_priv->params.enable_guc = 0; + dev_priv->params.request_timeout_ms = 0; + /* Setup the write-once "constant" device info */ device_info = mkwrite_device_info(dev_priv); memcpy(device_info, info, sizeof(*device_info));
This is cleaner and simpler than what I'd suggested. MST continues to work OK, and I haven't seen anything break as a result of the change. I did however notice that on a couple of shutdowns I got some additional console messages, although this _might_ be related to me having disabled MST in my primary display between boot and shutdown.
drm:pid8902:drm_dp_check_act_status *ERROR* [drm] *ERROR* Failed to get ACT after 3000ms, last status: 04 drm:pid8902:drm_dp_check_act_status *ERROR* [drm] *ERROR* Failed to get ACT after 3000ms, last status: 04 drm:pid8902:drm_dp_check_act_status *ERROR* [drm] *ERROR* Failed to get ACT after 3000ms, last status: 04
I also tested the use of concurrent DP and HDMI outputs on my T470 dock. Initially I thought that this wasn't working, but I am using a dock with 2xDP + 1xHDMI, and it seems like not all outputs are able to be used concurrently. So..dual displays with DP & HDMI works OK if I use a specific DP port on the back of the dock. There does also appear to be some fudging going on with output names in xrandr when running via the dock: the HDMI port is presented as DP output. I suspect that this might be due to the internals of the dock, though.
I've also checked that things work with the laptop undocked...but realised that it only has a single HDMI output. That works fine, and xrandr reports the output as HDMI-2. This does however seem to stop working if the laptop is subsequently docked, with xrandr then reporting that HDMI-2 is disconnected. This may also just be normal behaviour for a docked laptop.
Unfortunately there's now so much console output during startup that dmesg appears to be truncated - so I don't have a full dmesg to share after applying the new patch. I searched quickly for instructions on increasing the buffer size but only found a post from jj@ from 2006 (!). Given that things seem to work OK now I suppose that there's little interest in seeing a dmesg anyway, but I'm happy to provide one if it's useful.
Thanks again for the support to investigate this. Paul
