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([2a02:908:1252:fb60:be8a:bd56:1f94:86e7]) by smtp.gmail.com with ESMTPSA id t6sm1456158ejc.40.2020.09.09.02.15.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 09 Sep 2020 02:15:12 -0700 (PDT) Reply-To: christian.koenig@amd.com Subject: Re: [REGRESSION][BISECTED] 5.9-rc4 disables console on radeon To: Mikael Pettersson , Linux Kernel list , amd-gfx@lists.freedesktop.org, Kai-Heng Feng References: From: =?UTF-8?Q?Christian_K=c3=b6nig?= Message-ID: Date: Wed, 9 Sep 2020 11:15:11 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Yes, that is an already known issue. We are most likely going to revert the patch ASAP. Christian. Am 08.09.20 um 18:27 schrieb Mikael Pettersson: > Starting with linux-5.9-rc4, the Dell monitor on my desktop PC goes > black during boot > when the kernel activates the framebuffer console, except for this > error message shown > in the center of the screen: > > "Dell U2412M > The current input timing is not supported by the monitor display. Please > change your input timing to 1920x1200@60Hz or any other monitor > listed timing as per the monitor specifications. > " > > The monitor remains black until I reboot. > > All kernels up to and including 5.9-rc3 were Ok. A git bisect identified > > # first bad commit: [fc8c70526bd30733ea8667adb8b8ffebea30a8ed] > drm/radeon: Prefer lower feedback dividers > > as the culprit, and reverting that from -rc4 makes the console work again. > > Adding a bit of debugging code to that function shows: > > avivo_get_fb_ref_div: fb_div_new 136 fb_div_old 137 > avivo_get_fb_ref_div: fb_div_new 142 fb_div_old 143 > avivo_get_fb_ref_div: fb_div_new 136 fb_div_old 137 > avivo_get_fb_ref_div: fb_div_new 119 fb_div_old 120 > avivo_get_fb_ref_div: fb_div_new 136 fb_div_old 137 > > during boot, where "new" is what the commit above changed the code to compute, > and "old" is the value computed by the working code from rc3. > > The graphics card is a Radeon HD6450 silent model: > 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. > [AMD/ATI] Caicos [Radeon HD 6450/7450/8450 / R5 230 OEM] (prog-if 00 > [VGA controller]) > _______________________________________________ > amd-gfx mailing list > amd-gfx@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/amd-gfx