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Mon, 17 Aug 2026 14:59:09 -0700 (PDT) From: Zhefu Zhang To: Chang Jiong , intel-gfx@lists.freedesktop.org Cc: intel-xe@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Ville Syrjala , Gustavo Sousa , Jani Nikula , Rodrigo Vivi Subject: Re: [PATCH v2] drm/i915/cdclk: Don't force cd2x pipe select on Xe3 in bxt_sanitize_cdclk() Date: Tue, 18 Aug 2026 09:59:00 +1200 Message-ID: <20260817215901.459-1-a723356@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260816062344.796615-1-xspeed1989@gmail.com> References: <20260816062344.796615-1-xspeed1989@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit I hit the same bug independently on a Panther Lake laptop (Xiaomi Book Pro 14 2026, 8086:b080, Xe3_LPD display 30 stepping B0). Arch linux 7.1.8 stock reproduces the corruption with two "CPU pipe A FIFO underrun" errors. With the same change applied on 7.1.8, the panel is clean and the boot log has no FIFO underrun. Also verified the same change on current drm-tip (b801f94c49ffdb0f65e37baf31d68570356d4983): normal panel, no FIFO underrun. Tested-by: Zhefu Zhang