linux-kernel - Re: [PATCH 6.15 000/263] 6.15.5-rc1 review

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Message-ID: <20250704170700.GA3473@pc21.mareichelt.com>
Date: Fri, 4 Jul 2025 19:07:00 +0200
From: Markus Reichelt <lkt+2023@...eichelt.com>
To: stable@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6.15 000/263] 6.15.5-rc1 review

* Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:

> This is the start of the stable review cycle for the 6.15.5 release.
> There are 263 patches in this series, all will be posted as a response
> to this one.  If anyone has any issues with these being applied, please
> let me know.
> 
> Responses should be made by Sat, 05 Jul 2025 14:39:10 +0000.
> Anything received after that time might be too late.

Hi Greg

6.15.5-rc1 compiles on x86_64 (Xeon E5-1620 v2, Slackware64-15.0),
and boots on x86_64 (AMD Ryzen 5 7520U, Slackware64-current),
no dmesg regressions observed.

However, on my machine in /etc/rc.d/rc.local there is 

echo 20 > /sys/class/backlight/amdgpu_bl0/brightness

to adapt the brightness early in the boot process to save energy.
It works for me with kernel 6.15.4
before /etc/rc.d/rc.local is invoked there is:

cat /sys/class/backlight/amdgpu_bl0/brightness
50

but with 6.15.5-rc1 there is something off.
I get a blank screen as greeting. The network works.

Right after boot (before invoking /etc/rc.d/rc.local) I see:
cat /sys/class/backlight/amdgpu_bl0/brightness
400000

A comparable level of dimming on -rc1 to kernel 6.15.4 with my tuning is with a brightness value of 100000 

I noticed there's -rc2, will test soon.


Tested-by: Markus Reichelt <lkt+2023@...eichelt.com>