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Mon, 6 Jul 2026 12:16:42 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at policy01-mors.netcup.net Received: from mxe9fb.netcup.net (unknown [10.243.12.53]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by policy01-mors.netcup.net (Postfix) with ESMTPS id 4gv0dN6MWtz8sbk; Mon, 6 Jul 2026 12:16:40 +0200 (CEST) Received: from [IPV6:2a02:8108:8984:1d00:a0cf:1912:4be:477f] (unknown [IPv6:2a02:8108:8984:1d00:a0cf:1912:4be:477f]) by mxe9fb.netcup.net (Postfix) with ESMTPSA id 1472B60438; Mon, 6 Jul 2026 12:16:40 +0200 (CEST) Authentication-Results: mxe9fb; spf=pass (sender IP is 2a02:8108:8984:1d00:a0cf:1912:4be:477f) smtp.mailfrom=regressions@leemhuis.info smtp.helo=[IPV6:2a02:8108:8984:1d00:a0cf:1912:4be:477f] Received-SPF: pass (mxe9fb: connection is authenticated) Message-ID: Date: Mon, 6 Jul 2026 12:16:38 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] drm/mediatek: mtk_dsi: enable hs clock during pre-enable To: Adam Thiede , Gary Bisson Cc: Chun-Kuang Hu , Philipp Zabel , David Airlie , Simona Vetter , Matthias Brugger , AngeloGioacchino Del Regno , dri-devel@lists.freedesktop.org, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Linux kernel regressions list References: <20260120-mtkdsi-v1-1-b0f4094f3ac3@gmail.com> <42607fa4-485d-4142-b31c-7bfac71118d2@adamthiede.com> From: Thorsten Leemhuis Content-Language: de-DE, en-US X-Enigmail-Draft-Status: N11222 Autocrypt: addr=linux@leemhuis.info; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-PPP-Message-ID: <178333300057.643948.6218888156290066716@mxe9fb.netcup.net> X-NC-CID: CjcezfaIEXrSstuGOSqS1Cqzufs3YbLMXdijf71d3Ds3mx8zQQM= X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260706_031646_795080_A49C8876 X-CRM114-Status: GOOD ( 21.12 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 6/22/26 15:23, Adam Thiede wrote: > On 6/22/26 06:22, Gary Bisson wrote: >> On Thu, Jun 18, 2026 at 04:06:28PM -0500, Adam Thiede wrote: >>> On 1/20/26 05:36, Gary Bisson wrote: >>>> Some bridges, such as the TI SN65DSI83, require the HS clock to be >>>> running in order to lock its PLL during its own pre-enable function. >>>> >>>> Without this change, the bridge gives the following error: >>>> sn65dsi83 14-002c: failed to lock PLL, ret=-110 >>>> sn65dsi83 14-002c: Unexpected link status 0x01 >>>> sn65dsi83 14-002c: reset the pipe >>>> [...] >>> >>> This commit was part of 7.1 and caused a problem for me. >>> I'm running postmarketOS (basically Alpine Linux) on a Lenovo C330 >>> chromebook with a Mediatek MT8173 processor. >>> The problem: when the display on my laptop powers off (via suspend or >>> idle, >>> like xset dpms off) the picture does not come back when the display >>> powers >>> back on (from resume). The display backlight comes on and brightness is >>> adjustable but there is no picture. The only fix is to reboot. >>> >>> Reverting this commit and applying it as a patch on top of 7.1 >>> addresses the >>> issue for me. >>> >>> You can view the config I'm using here: >>> https://gitlab.postmarketos.org/postmarketOS/pmaports/-/ >>> merge_requests/8819 >>> >>> Is there any sort of testing or other debugging info I can provide to >>> help >>> address this issue? >> >> Thanks for reporting the issue, could you share some logs? Is the driver >> saying anything during resume? Also, what type of panel is used on that >> chromebook? > > The curious thing is that there are no real logs in dmesg or /var/log/ > messages about this. This picture just fails to come back. If there are > some kernel params I can set to get deeper logging, that would help, but > I'm not aware of any. > > I think the panel is a "BOE NV116WHM-T00" - I used this command to get > info: cat /sys/class/drm/card0-eDP-1/edid | edid-decode > > Output: https://termbin.com/8nbd This looked stalled. If I'm mistaken here, please let me known; but if no solution is in sight, should we maybe just revert the change until a proper was found? Ciao, Thorsten