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Release notes: switch to modesetting: mention backlight problem

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Michael Raskin 2019-03-07 13:38:05 +01:00
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nixos/doc/manual/release-notes/rl-1903.xml
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@ -666,6 +666,10 @@
Some OpenCL and VA-API applications might also break
(Beignet seems to provide OpenCL support with
<literal>modesetting</literal> driver, too).
Kernel mode setting API does not support backlight control,
so <literal>xbacklight</literal> tool will not work;
backlight level can be controlled directly via <literal>/sys/</literal>
or with <literal>brightnessctl</literal>.
Users who need this functionality more than multi-output XRandR are advised
to add `intel` to `videoDrivers` and report an issue (or provide additional
details in an existing one)