Re: [PATCH 0/2] drm/i915/backlight: Sanitize BIOS-enabled PCH PWM in full-AUX VESA path

["Brandt, Todd E" <todd.e.brandt@intel.com>]

On Thu, 2026-05-14 at 11:28 +0530, Suraj Kandpal wrote:
> In full-AUX VESA mode (aux_enable && aux_set) the driver never
> touches the
> native PCH PWM. If BIOS left the PWM CTL register enabled, the PCH
> PWM keeps
> the system alive during s2idle and blocks S0ix. This series sanitizes
> that
> stale BIOS state on first enable so S0ix is no longer blocked, while
> keeping
> runtime behaviour otherwise unchanged.
> Patch 1 is a minor debug-message rename cleanup.
> 
> Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
> 
> Suraj Kandpal (2):
>   drm/i915/backlight: Rename debug message in the setup() callback
>   drm/i915/backlight: Sanitize BIOS-enabled PCH PWM in full-AUX VESA
>     path
> 
>  .../gpu/drm/i915/display/intel_backlight.c    | 14 ++++----
>  .../drm/i915/display/intel_dp_aux_backlight.c | 32 +++++++++++++----
> --
>  2 files changed, 30 insertions(+), 16 deletions(-)
> 
 
Here's the info on my testing, I opened the bug in bugzilla and gitlab
and tested the patch.

Tested-by: Todd Brandt <todd.e.brandt@intel.com>
Reported-by: Todd Brandt <todd.e.brandt@intel.com>
Closes:
https://gitlab.freedesktop.org/drm/i915/kernel/-/work_items/16043
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=221486