Re: REGRESSION: ThinkPad W530 dim backlight with recent changes introduced in Linux 6.1.24

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Hi Русев,

On 4/28/23 15:22, Hans de Goede wrote:
> Hi Русев,
> 
> On 4/27/23 17:35, Русев Путин wrote:
>>> 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.
> 
> Ok, lets remove the acpi_backlight=video quirk for Lenovo ThinkPad W530
> then. This was intended to make life easier for Nvidia binary driver
> users, but since it is causing issues elsewhere  Nvidia binary driver
> users will just have to manually pass acpi_backlight=video on
> the kernel commandline until Nvidia fixes the driver.
> 
> I'll submit a patch to remove the quirk right away.

p.s.

In the mean time you can work around the regression by passing:
"acpi_backlight=native" on the kernel commandline.

Regards,

Hans





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