Mark,

Mark Hindley - 22.12.21, 12:47:55 CET:
> On Wed, Dec 22, 2021 at 11:19:17AM +0100, Martin Steigerwald wrote:
> > I'd really welcome this after I "bricked" another device due to
> > exactly this bug. I needed to put GRML to an USB stick and boot
> > from there in order to recover.
>
> How does the attached patch look? Are you able to test?

I tested on a ThinkPad laptop with Intel graphics:

Without patch:

root@somehost:/var/lib/initscripts# cat brightness.intel
512
root@somehost:/var/lib/initscripts# /etc/init.d/brightness stop
root@somehost:/var/lib/initscripts# cat brightness.intel
0

With patch:

root@somehost:/var/lib/initscripts# echo 512 > brightness.intel
root@somehost:/var/lib/initscripts# cat brightness.intel
512

root@somehost:/var/lib/initscripts# /etc/init.d/brightness stop
root@somehost:/var/lib/initscripts# cat brightness.intel
512

I think it should work.

Thanks,
--
Martin