Re: [PATCH v1] drm/panel: panel-edp: Adjust T8 timing for AUO B116XAK01.6 and B140XTK02.4

[Doug Anderson <dianders@chromium.org>]

Hi,

On Thu, Jul 16, 2026 at 8:00 PM dioyc_zhang
<dioyc_zhang@compal.corp-partner.google.com> wrote:
>
> Screen garbage or flickering can be observed during mode changes (such
> as VT switches) on systems using the AUO B116XAK01.6 and B140XTK02.4 panels.
> This occurs because the backlight is enabled before the video signal
> stabilizes. Waveform measurements show that the panel signal takes around
> 140ms to stabilize after a mode change, meaning the previous 50ms T8
> timing was insufficient.
>
> To resolve this issue, adjust the eDP panel delay entry from
> delay_200_500_e50 to delay_200_500_e200 (increasing T8 from 50ms to 200ms).
> This matches the updated panel specifications from AUO, which now formally
> define T8 as 200ms to mask any display abnormalities during mode changes.

Great description / justification. Increasing delays always stinks,
but sometimes is unavoidable.


> Signed-off-by: dioyc_zhang <dioyc_zhang@compal.corp-partner.google.com>

Any chance you could improve the "Name" part of your Signed-off-by
(and patch authorship, too)? Is "dioyc_zhang" really a name that you
usually use to identify yourself? It seems like it was just git
automatically assigning something since you typed in an email address
but not a name...

-Doug