> -----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]>
> /* Xiaomi Book Pro 14 2026 */
> { 0xb081, 0x1d72, 0x2424, quirk_disable_psr2 }, };
> --
> 2.50.1
