UBUNTU: SAUCE: drm/i915: Disable PSR by default on all platforms

BugLink: https://bugs.launchpad.net/bugs/1849947
On all Dell laptops with screens and chipsets that support PSR, both
PSR1 and PSR2 cause flickering and graphical glitches. Many laptops
don't support PSR so it isn't known if PSR works correctly on any
consumer hardware. PSR was enabled by default in 5.0 for capable
hardware, so this patch just restores the previous functionality of PSR
being disabled by default.

More info is available on the freedesktop bug:
https://gitlab.freedesktop.org/drm/intel/issues/425

Signed-off-by: Sultan Alsawaf <sultan.alsawaf@canonical.com>
Acked-by: Andrea Righi <andrea.righi@canonical.com>
Acked-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
index 5b07766a1c26ef7aa2c15f7548b22cdcf36c4d9f..71953f4e019f2b8fcab696ff0e0040bffec0347b 100644 (file)
--- a/drivers/gpu/drm/i915/i915_params.c
+++ b/drivers/gpu/drm/i915/i915_params.c
@@ -84,8 +84,7 @@ i915_param_named_unsafe(enable_hangcheck, bool, 0600,
 
 i915_param_named_unsafe(enable_psr, int, 0600,
        "Enable PSR "
-       "(0=disabled, 1=enabled) "
-       "Default: -1 (use per-chip default)");
+       "(-1=use per-chip default, 0=disabled [default], 1=enabled) ");
 
 i915_param_named_unsafe(force_probe, charp, 0400,
        "Force probe the driver for specified devices. "

diff --git a/drivers/gpu/drm/i915/i915_params.h b/drivers/gpu/drm/i915/i915_params.h
index a4770ce46bd2407ada2b361e0efd242814000c9e..d0167c5f47ffee9b7e89f5c20f4e9d21157cdcf5 100644 (file)
--- a/drivers/gpu/drm/i915/i915_params.h
+++ b/drivers/gpu/drm/i915/i915_params.h
@@ -50,7 +50,7 @@ struct drm_printer;
        param(int, vbt_sdvo_panel_type, -1) \
        param(int, enable_dc, -1) \
        param(int, enable_fbc, -1) \
-       param(int, enable_psr, -1) \
+       param(int, enable_psr, 0) \
        param(int, disable_power_well, -1) \
        param(int, enable_ips, 1) \
        param(int, invert_brightness, 0) \