Hallo Wofram, Thierry, Rob, and Linux-tegra list, from a user perspective the Linux kernel is still broken on the Acer CB5-311 (tegra124): today I compiled Linux 4.20rc6 (using "make localmodconfig", running a patched 4.18), and the resulting kernel again only booted with a blank screen (no backlight). Here are my kernel messages from the 4.20rc6 boot: https://freimarkt.org/nouveau/journal.4.20rc6.html I can see that drm_dp_helper.c has changed quite a bit since 4.18, but I don't understand what's happening there. Thanks for your efforts, and do let me know if I can help by testing something! I removed most of the original message's CC recipients since I don't want to annoy them with my reply. Regards, Vlado Am 11.12.18 um 20:43 schrieb Wolfram Sang: > Any update on this patch? I thought it was interesting. > > BTW adding Rob (finally) to CC... > > On Mon, Oct 01, 2018 at 01:02:30AM +0200, Wolfram Sang wrote: >> On Tue, Sep 25, 2018 at 06:06:11PM +0200, Thierry Reding wrote: >>> From: Thierry Reding <treding@xxxxxxxxxx> >>> >>> If an I2C adapter doesn't match the provided device tree node, also try >>> matching the parent's device tree node. This allows finding an adapter >>> based on the device node of the parent device that was used to register >>> it. >>> >>> Signed-off-by: Thierry Reding <treding@xxxxxxxxxx> >>> --- >>> Hi Wolfram, >>> >>> This is a fix for the issue discussed in a long email thread a couple of >>> months ago. In a nutshell the issue is that we want to be able to find a >>> I2C-over-AUX adapter based on the device tree node (this is to hook up a >>> I2C adapter for use as DDC to query EDID from a display panel, for >>> example). >>> >>> Here's a link to the prior discussion, which ended up getting split into >>> two for some reason, possibly because the initial submission and >>> subsequent discussion took place over an extended period of time: >>> >>> https://patchwork.kernel.org/patch/9516105/ >>> https://patchwork.kernel.org/patch/10200879/ >> Ok, I read that... [...]
