[PATCH] Lenovo X13 Yoga OLED panel brightness fix

Mark Pearson mpearson at lenovo.com
Mon May 18 00:06:43 UTC 2020


Patch to fix an issue controlling the brightness of the OLED panel on the Lenovo X13 Yoga 
Please let me know any feedback or questions.
Note - apologies if this message has shown up before - I had some mail client issues.

Mark Pearson

Add another panel that needs the edid quirk to the list so that brightness 
control works correctly. Fixes issue seen on Lenovo X13 Yoga with OLED panel

Co-developed-by: jendrina at lenovo.com
Signed-off-by: jendrina at lenovo.com
Signed-off-by: Mark Pearson <mpearson at lenovo.com>
Reviewed-by: Lyude Paul <lyude at redhat.com>
drivers/gpu/drm/drm_dp_helper.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index c6fbe6e6bc9d..41f0e797ce8c 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -1313,6 +1313,7 @@ static const struct edid_quirk edid_quirk_list[] = {
               { MFG(0x06, 0xaf), PROD_ID(0xeb, 0x41), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
               { MFG(0x4d, 0x10), PROD_ID(0xc7, 0x14), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
               { MFG(0x4d, 0x10), PROD_ID(0xe6, 0x14), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
+             { MFG(0x4c, 0x83), PROD_ID(0x47, 0x41), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },

 #undef MFG

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