Re: [PATCH v2] drm/panel: panel-edp: Adjust T8 timing for AUO B116XAK01.6

[Doug Anderson]

Hi,

On Sun, Jul 19, 2026 at 7:54 PM dioyc_zhang
<dioyc_zhang@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> From: Dio Zhang <dioyc_zhang@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
>
> 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.
>
> Signed-off-by: Dio Zhang <dioyc_zhang@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
> ---
>  drivers/gpu/drm/panel/panel-edp.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

A few notes:

* Your email client is still slightly misconfigured in regards to real
name. As you can see, when I quoted your message above it still says
"On Sun, Jul 19, 2026 at 7:54 PM dioyc_zhang <..." instead of "On Sun,
Jul 19, 2026 at 7:54 PM Dio Zhang <...". In any case, at least the
patch authorship and Signed-off-by look fine. Just something to try to
improve for the next patch. ;-)

* The patch doesn't apply cleanly to drm-misc-next. Presumbly you sent
it based on an older tree. Ideally, send patches against drm-misc-next
for panel-edp. I've fixed it up this time, but it's an extra step for
me.

* Subject line only referenced one of the two panels. I've fixed this
up for you.


Reviewed-by: Douglas Anderson <dianders@xxxxxxxxxxxx>

Pushed to drm-misc-next:

[1/1] drm/panel: panel-edp: Adjust T8 timing for AUO B116XAK01.6 and B140XTK02.4
      commit: 0d40cab39158704e372240ed9821a00bfe117125

-Doug