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[2001:1c00:c1e:bf00:1054:9d19:e0f0:8214]) by smtp.gmail.com with ESMTPSA id k6sm10278281ejb.84.2021.02.09.03.46.47 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 09 Feb 2021 03:46:47 -0800 (PST) Subject: Re: [Intel-gfx] [5.10.y regression] i915 clear-residuals mitigation is causing gfx issues To: Chris Wilson , Greg Kroah-Hartman , intel-gfx , stable@vger.kernel.org References: <161282685855.9448.10484374241892252440@build.alporthouse.com> From: Hans de Goede Message-ID: Date: Tue, 9 Feb 2021 12:46:46 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.0 MIME-Version: 1.0 In-Reply-To: <161282685855.9448.10484374241892252440@build.alporthouse.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org Hi, On 2/9/21 12:27 AM, Chris Wilson wrote: > Quoting Hans de Goede (2021-02-08 20:38:58) >> 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: > > I tried to reproduce this on the w/e on hsw-gt1, to no avail; and piglit > did not report any differences with and without mitigations. I have yet > to test other platforms. So I don't yet have an alternative. Note the original / first reporter of: https://bugzilla.redhat.com/show_bug.cgi?id=1925346 Is using hsw-gt2, so it seems that the problem is not just the enabling of the mitigations on ivy-bridge / bay-trail but that there actually is a regression on devices where the WA worked fine before... If you have access to a hsw-gt2 device then testing there might help? Also note that this reproduces more easily on 5.10.10, which does not have: 520d05a77b2866eb ("drm/i915/gt: Clear CACHE_MODE prior to clearing residuals") Not sure if that helps though. > Though note > that v5.11 and v5.12 will behave similarly, so we need to urgently find > a fix for Linus's tree anyway. Ack. Regards, Hans