From: Sultan Alsawaf sultan@kerneltoast.com
On all Dell laptops with panels and chipsets that support PSR (an esoteric power-saving mechanism), both PSR1 and PSR2 cause flickering and graphical glitches, sometimes to the point of making the laptop unusable. Many laptops don't support PSR so it isn't known if PSR works correctly on any consumer hardware as of 5.4. 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
Cc: stable@vger.kernel.org # 5.4.x Signed-off-by: Sultan Alsawaf sultan@kerneltoast.com --- drivers/gpu/drm/i915/i915_params.c | 3 +-- drivers/gpu/drm/i915/i915_params.h | 2 +- 2 files changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c index 296452f9efe4..4a0d37f7cf49 100644 --- 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 d29ade3b7de6..715888811593 100644 --- 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) \