On Sun, 18 Feb 2018, Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx> wrote:
> Similar to commit e10aec652f31 ("drm/edid: Add 6 bpc quirk for display
> AEO model 0."), the EDID reports "DFP 1.x compliant TMDS" but it support
> 6bpc instead of 8 bpc.
>
> Hence, use 6 bpc quirk for this panel.
>
> Fixes: 196f954e2509 ("drm/i915/dp: Revert "drm/i915/dp: fall back to 18 bpp when sink capability is unknown"")
Implies
Cc: <stable@xxxxxxxxxxxxxxx> # v4.8+
> BugLink: https://bugs.launchpad.net/bugs/1749420
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/drm_edid.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index ddd537914575..d9c8d718e261 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -113,6 +113,9 @@ static const struct edid_quirk {
> /* AEO model 0 reports 8 bpc, but is a 6 bpc panel */
> { "AEO", 0, EDID_QUIRK_FORCE_6BPC },
>
> + /* CPT panel of Asus UX303LA reports 8 bpc, but is a 6 bpc panel */
> + { "CPT", 0x17df, EDID_QUIRK_FORCE_6BPC },
> +
> /* Belinea 10 15 55 */
> { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 },
> { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 },
--
Jani Nikula, Intel Open Source Technology Center
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