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Date: Wed, 29 Apr 2026 14:24:55 +0200
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Subject: Re: Linux 7.1-rc1
To: Luna Jernberg <droidbittin@gmail.com>,
 Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>,
 Linus Torvalds <torvalds@linux-foundation.org>, lee@kernel.org,
 Jani Nikula <jani.nikula@linux.intel.com>,
 intel-gfx-bugs@lists.freedesktop.org,
 Mikael Eriksson <mikael_eriksson@miffe.org>,
 Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
 Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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From: Hans de Goede <hansg@kernel.org>
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Hi Luna,

Thank you for testing the rc kernels.

On 29-Apr-26 09:33, Luna Jernberg wrote:
> Hard to show but backlight turns on with one and not the other

I see an image on both pictures, so to me it looks like the backlight
is on in both cases otherwise the image would not be visible at all.

I guess what you mean is that the backlight is less bright in one
image vs the other image ?

Have you tried changing the brightness with the brightness slider
in the top right gnome shell system menu (which is open in one
your 2 screenshots) ?

What is the output of:

ls -l /sys/class/backlight/

With the working 7.0.2 kernel ?

And what is the output of the same command with the non working
7.1-rc1 kernel ?

Regards,

Hans