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[2001:1c00:c1e:bf00:1054:9d19:e0f0:8214]) by smtp.gmail.com with ESMTPSA id v9sm9266436ejd.92.2021.02.08.12.38.59 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 08 Feb 2021 12:38:59 -0800 (PST) To: Greg Kroah-Hartman , stable@vger.kernel.org, Chris Wilson , intel-gfx From: Hans de Goede Message-ID: Date: Mon, 8 Feb 2021 21:38:58 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.0 MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=hdegoede@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Subject: [Intel-gfx] [5.10.y regression] i915 clear-residuals mitigation is causing gfx issues X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" Hi All, We (Fedora) have been receiving reports from multiple users about gfx issues / glitches stating with 5.10.9. All reporters are users of Ivy Bridge / Haswell iGPUs and all reporters report that adding i915.mitigations=off to the cmdline fixes things, see: https://bugzilla.redhat.com/show_bug.cgi?id=1925346 Which should be fully visible without a bugzilla account. I noticed that 5.10.13 had one more related i915 patch, so I've asked the reporters to retest with 5.10.13, 5.10.13 is better, but things are not fixed there, it just takes longer for the problems to show up. Greg, I can prepare a Fedora test-kernel build for the reporters to test with the following 3 commits reverted: 520d05a77b2866eb ("drm/i915/gt: Clear CACHE_MODE prior to clearing residuals") ecca0c675bdecebd ("drm/i915/gt: Restore clear-residual mitigations for Ivybridge, Baytrail") 48b8c6689efa7cd6 ("drm/i915/gt: Limit VFE threads based on GT") (Note this are the 5.10.y hashes) Reverting these 3 is not ideal, but it is probably the fastest way to get this resolved for the 5.10.y series. Greg, do you want me to have the reporters test a 5.10.y series kernel with these 3 reverts ? Regards, Hans _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx