From: jsg <jsg@openbsd.org>
Date: Mon, 12 Sep 2022 14:18:17 +0000 (+0000)
Subject: disable Panel Self Refresh (PSR) by default in inteldrm
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=174e571648393ebea94e93a39d7a3cc55edab083;p=openbsd

disable Panel Self Refresh (PSR) by default in inteldrm

After i915_drv.c 1.144 PSR changed to being on by default.
On a TUXEDO InfinityBook Pro 14 Gen6 (Tiger Lake) this introduced screen
flicker.  Reported and tested by Matthias Schmidt.

Should also avoid flicker problem on Dell XPS 13 7390 (Comet Lake)
reported by James Cook.
---

diff --git a/sys/dev/pci/drm/i915/i915_drv.c b/sys/dev/pci/drm/i915/i915_drv.c
index 6d4bb89a3fd..ad36e5aaf52 100644
--- a/sys/dev/pci/drm/i915/i915_drv.c
+++ b/sys/dev/pci/drm/i915/i915_drv.c
@@ -2414,6 +2414,7 @@ inteldrm_attach(struct device *parent, struct device *self, void *aux)
 	i915_params_copy(&dev_priv->params, &i915_modparams);
 	dev_priv->params.enable_guc = 0;
 	dev_priv->params.request_timeout_ms = 0;
+	dev_priv->params.enable_psr = 0;
 
 	/* Setup the write-once "constant" device info */
 	device_info = mkwrite_device_info(dev_priv);