doc: Added known issues related to Matter

Added two new known issues and fix to the smoke co alarm readme. Signed-off-by: Kamil Kasperczyk <[email protected]>
nrfconnect · Jan 14, 2025 · d82ef03 · d82ef03
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diff --git a/doc/nrf/releases_and_maturity/known_issues.rst b/doc/nrf/releases_and_maturity/known_issues.rst
@@ -506,6 +506,15 @@ The issues in this section are related to the :ref:`ug_matter` protocol.
 
 .. rst-class:: v2-9-0
 
+NCSDK-28567: Swap time after DFU takes a very long time
+  Due to the incorrect RRAM buffer configuration, the swap time after DFU can exceed 3 minutes.
+
+  **Affected platforms:** nRF54L15
+
+  **Workaround:** Set the :kconfig:option:`CONFIG_NRF_RRAM_WRITE_BUFFER_SIZE` Kconfig option to ``1`` in the :file:`sysbuild/mcuboot/boards/nrf54l15dk_nrf54l15_cpuapp.conf` file of the application.
+
+.. rst-class:: v2-9-0
+
 KRKNWK-19846: Wrong command for the internal configuration build in the :ref:`matter_template_sample` sample documentation
   There is an obsolete and wrong command for building the sample for the nRF54L15 DK with support for Matter OTA DFU and DFU over Bluetooth SMP, and using internal MRAM only.
 
@@ -2805,6 +2814,12 @@ Matter samples
 
 The issues in this section are related to :ref:`matter_samples`.
 
+.. rst-class:: v2-9-0
+
+KRKNWK-19861: ICD DSLS does not work with the Smoke CO Alarm
+  According to the sample's readme the ICD DSLS can be enabled by setting :kconfig:option:`CONFIG_CHIP_ICD_DSLS_SUPPORT` Kconfig option to ``y``.
+  There is a missing information that additionally the ICD Management cluster's feature map has to be set to ``0xf`` in the sample's ``.zap`` file.
+
 .. rst-class:: v2-8-0
 
 KRKNWK-19691: Smoke CO Alarm sample does not have PM device enabled

diff --git a/samples/matter/smoke_co_alarm/README.rst b/samples/matter/smoke_co_alarm/README.rst
@@ -74,7 +74,8 @@ The device uses the SIT mode, when the wired power source is active.
 Otherwise, it switches to the LIT mode, to indicate that it is possible to save the energy, when using a battery power source.
 Dynamic switching is possible only if the ICD device meets all criteria for operating in the LIT mode (it has at least one client registered).
 DSLS support is disabled by default.
-To enable it, set the :kconfig:option:`CONFIG_CHIP_ICD_DSLS_SUPPORT` Kconfig option to ``y``.
+To enable it, set the :kconfig:option:`CONFIG_CHIP_ICD_DSLS_SUPPORT` Kconfig option to ``y`` and enable the feature support in the ICD Management cluster's feature map, by setting it to ``0xf`` in the sample's ``.zap`` file.
+Remember to re-generate the source files after modifying the ``.zap`` file.
 
 In the LIT mode, the device responsiveness is much lower than in the SIT mode.
 However, you can request the device to become responsive to, for example, change its configuration.