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Tue, 27 Oct 2026 15:33:00 -0700 (PDT) Received: from localhost ([178.214.243.78]) by smtp.gmail.com with ESMTPSA id 38308e7fff4ca-3ac709d1c1asm27657721fa.16.2026.10.27.15.32.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Oct 2026 15:32:59 -0700 (PDT) From: Mikhail Gavrilov To: Harry Wentland , Leo Li , Rodrigo Siqueira , Alex Deucher Cc: =?UTF-8?q?Christian=20K=C3=B6nig?= , Fangzhi Zuo , Aurabindo Pillai , George Zhang , amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, regressions@lists.linux.dev, Calvin Owens Subject: Re: [REGRESSION 7.3] drm/amd/display: single-frame scanout corruption on DCN32 at 120 Hz since a637a140ab86 Date: Wed, 28 Oct 2026 03:32:47 +0500 Message-ID: <20261027223247.300463-1-mikhail.v.gavrilov@gmail.com> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261018223905.32324-1-mikhail.v.gavrilov@gmail.com> References: <20261018223905.32324-1-mikhail.v.gavrilov@gmail.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Calvin Owens bisected the same artefact to a637a140ab86 on his RX 7900, with the same parent good, and posted a revert. On his machine the band appears within 30 minutes, and the revert removes it: https://lore.kernel.org/all/25995707c39c0c191e3ac46c4813f55a7f928403.1793131583.git.calvin@wbinvd.org/ #regzbot monitor: https://lore.kernel.org/all/25995707c39c0c191e3ac46c4813f55a7f928403.1793131583.git.calvin@wbinvd.org/ A correction to my earlier mails, which listed the instruction constants and the stack among the DMUB windows that a637a140ab86 moves to GTT. When the firmware is loaded through the PSP, the default on these cards, the driver neither copies the instruction constants into its window nor programs the instruction and stack windows (dm_dmub_hw_init(), dmub_srv_hw_init()), so the firmware does not run from the driver's copies of those two. The windows the driver does set up -- BSS data, VBIOS, mailbox, trace buffer, firmware state, shared state and the rest -- did move. -- Thanks, Mikhail