On 9/7/2026 10:46 AM, Garg, Nemesa wrote:
-----Original Message-----
From: Intel-gfx <[email protected]> On Behalf Of Ankit
Nautiyal
Sent: Monday, September 7, 2026 9:16 AM
To: [email protected]; [email protected]
Cc: [email protected]; [email protected];
[email protected]; Nautiyal, Ankit K <[email protected]>;
[email protected]
Subject: [PATCH] drm/i915/quirks: Limit eDP rate to HBR2 on HP Pavilion Plus
14-ew1
The eDP panel on the HP Pavilion Plus Laptop 14-ew1xxx advertises HBR3
while leaving the TPS4 support bit clear. The output however flickers, once
link is trained with HBR3.
Until commit 8c9006283e4b ("Revert "drm/i915/dp: Reject HBR3 when sink
doesn't support TPS4"") such sinks were capped at HBR2 by the TPS4 check
which incidentally kept this panel stable. That check was reverted because
other panels legitimately need HBR3 without advertising TPS4, and the per-
machine QUIRK_EDP_LIMIT_RATE_HBR2 was introduced to handle the
affected machines instead.
Add the machine to the list of devices that need the
QUIRK_EDP_LIMIT_RATE_HBR2.
Fixes: 8c9006283e4b ("Revert "drm/i915/dp: Reject HBR3 when sink doesn't
support TPS4"")
Reported-by: Annoy Cc <[email protected]>
Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/work_items/16743
Cc: <[email protected]> # v6.18+
Tested-by: Annoy Cc <[email protected]>
Signed-off-by: Ankit Nautiyal <[email protected]>
---
drivers/gpu/drm/i915/display/intel_quirks.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_quirks.c
b/drivers/gpu/drm/i915/display/intel_quirks.c
index 33245f44c0d5..7d7db774d8c7 100644
--- a/drivers/gpu/drm/i915/display/intel_quirks.c
+++ b/drivers/gpu/drm/i915/display/intel_quirks.c
@@ -257,6 +257,9 @@ static struct intel_quirk intel_quirks[] = {
/* Dell XPS 13 7390 2-in-1 */
{ 0x8a52, 0x1028, 0x08b0, quirk_edp_limit_rate_hbr2 },
+ /* HP Pavilion Plus Laptop 14-ew1xxx */
+ { 0x7d55, 0x103c, 0x8c31, quirk_edp_limit_rate_hbr2 },
+
LGTM,
Reviewed-by: Nemesa Garg <[email protected]>
Thanks Nemesa for the review, pushed to drm-intel-next.
Regards,
Ankit
/* Xiaomi Book Pro 14 2026 */
{ 0xb081, 0x1d72, 0x2424, quirk_disable_psr2 }, };
--
2.50.1
