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Date: Fri, 17 Mar 2023 11:04:12 +0100 From: Takashi Iwai <tiwai@...e.de> To: Hans de Goede <hdegoede@...hat.com> Cc: linux-kernel@...r.kernel.org, regressions@...ts.linux.dev, dri-devel@...ts.freedesktop.org Subject: [REGRESSION] Missing nouveau backlight control on 6.2.x kernel Hi, we've received a regression report on openSUSE Bugzilla about the missing backlight control of nouveau device: https://bugzilla.opensuse.org/show_bug.cgi?id=1209296 On 6.1, with acpi_video=native option, the system provided /sys/class/backlight/nv_backlight entry. On 6.2, with acpi_video=native option, there is no entry in /sys/class/backlight. And without acpi_video option, it falls back to /sys/class/backlight/acpi_video0, which doesn't work as expected. Hans, could you check whether the recent change in video_detect.c (or anything else) may influence on this? My gut feeling is that the culprit could be rather some change in nouveau (so dri-devel is Cc'ed), but I'm not entirely sure... Thanks! Takashi
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