From: Takashi Iwai <tiwai@suse.de>
To: Hans de Goede <hdegoede@redhat.com>
Cc: linux-kernel@vger.kernel.org, regressions@lists.linux.dev,
dri-devel@lists.freedesktop.org
Subject: [REGRESSION] Missing nouveau backlight control on 6.2.x kernel
Date: Fri, 17 Mar 2023 11:04:12 +0100 [thread overview]
Message-ID: <87wn3f8zj7.wl-tiwai@suse.de> (raw)
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
next reply other threads:[~2023-03-17 10:04 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-17 10:04 Takashi Iwai [this message]
2023-03-18 16:49 ` [REGRESSION] Missing nouveau backlight control on 6.2.x kernel Hans de Goede
2023-03-19 7:34 ` Takashi Iwai
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