> This patch should not change the maximum brightness. But you may need to adjust the brightness once after changing to a new kernel with the patch because the range / brightness-curve may be different. This patch does change the display brightness curve but it is very buggy and does not change the brightness as soon as set. There is a very significant delay in brightness transition on the laptop due to this patch. Also it is worth mentioning that this patch also messes up color contrast of the display causing significantly deeper blacks on the display. > I would expect you to be able to get back your old brightness level then and this should persist over reboots after you have adjusted it once. >what happens if you use e.g. Fn + F9 to increase the brightness Here are the attached pictures explaining the situation. 100% brightness on Kernel 6.3-rc7 - https://i.imgur.com/eQK890s.jpg 100% brightness on Kernel 6.1.22 - https://i.imgur.com/1rgNtxJ.jpg Thanks. On Fri, Apr 21, 2023 at 12:05 AM Hans de Goede <hdegoede@xxxxxxxxxx> wrote: > > Hi Русев Путин, > > On 4/20/23 19:02, Rafael J. Wysocki wrote: > > CC: Hans > > > > On Thu, Apr 20, 2023 at 6:38 PM Русев Путин <rockeraliexpress@xxxxxxxxx> wrote: > >> > >>> Any reason why you didn't cc: the developers of that commit? > >> Sorry I did not realise I should have done that. > >> > >>> Do you also have this issue on the latest 6.3-rc release? > >> Yes I have tested it recently by installing the latest 6.3-rc7 kernel > >> , and I do encounter the same issue there. I have linked the > >> screenshots below referring the same. > >> Kernel 6.3.0-rc7 with 43% brightness - https://i.imgur.com/5LqsEJb.jpg > >> > >>> That's what this commit does, right? > >> According to the commit , it was pushed to fix backlight controls > >> which were broken on Lenovo Thinkpad W530 while using NVIDIA. It was > >> not intended to reduce the backlight intensity on W530. Backlight is > >> dimmer than before even when using the laptop in Intel iGPU mode. > > This patch should not change the maximum brightness. But you may need > to adjust the brightness once after changing to a new kernel with > the patch because the range / brightness-curve may be different. > > On the imgur URL your display brightness shows as being at 43%, > what happens if you use e.g. Fn + F9 to increase the brightness ? > > I would expect you to be able to get back your old brightness level > then and this should persist over reboots after you have adjusted > it once. > > If adjusting it does not help / work then we will need to revert > the patch causing this. > > Regards, > > Hans > >
