diff --combined core/modules/comment/comment.install
index a4bbc9f,b67825e..0000000
--- a/core/modules/comment/comment.install
+++ b/core/modules/comment/comment.install
@@@ -127,30 -127,3 +127,30 @@@ function comment_update_8001() 
  /**
   * @} End of "addtogroup updates-8.0.0-rc".
   */
 +
 +/**
 + * Adds the new 'view_mode' setting to all view displays using the
 + * 'comment_default' formatter.
 + */
 +function comment_update_8101() {
 +  $config_factory = \Drupal::configFactory();
 +  // Iterate on all entity view displays.
 +  foreach ($config_factory->listAll('core.entity_view_display.') as $name) {
 +    $changed = FALSE;
 +    $display = $config_factory->getEditable($name);
 +    $components = $display->get('content') ?: [];
 +    foreach ($components as $field_name => $component) {
 +      if (isset($component['type']) && ($component['type'] === 'comment_default')) {
 +        if (empty($display->get("content.{$field_name}.settings.view_mode"))) {
 +          $display->set("content.{$field_name}.settings.view_mode", 'default');
 +          $changed = TRUE;
 +        }
 +      }
 +    }
 +
 +    if ($changed) {
 +      $display->save(TRUE);
 +    }
 +  }
 +
 +}
diff --combined core/modules/comment/comment.module
index 1b2340b,e333b56..0000000
--- a/core/modules/comment/comment.module
+++ b/core/modules/comment/comment.module
@@@ -14,7 -14,6 +14,7 @@@ use Drupal\comment\CommentInterface
  use Drupal\comment\Entity\CommentType;
  use Drupal\Core\Entity\FieldableEntityInterface;
  use Drupal\comment\Plugin\Field\FieldType\CommentItemInterface;
 +use Drupal\Core\Entity\Entity\EntityViewMode;
  use Drupal\Core\Entity\EntityInterface;
  use Drupal\Core\Form\FormStateInterface;
  use Drupal\Core\Routing\RouteMatchInterface;
@@@ -757,43 -756,3 +757,43 @@@ function comment_preprocess_field(&$var
  function comment_ranking() {
    return \Drupal::service('comment.statistics')->getRankingInfo();
  }
 +
 +/**
 + * Implements hook_ENTITY_TYPE_presave() for entity_view_display entities.
 + */
 +function comment_entity_view_display_presave(EntityViewDisplayInterface $display) {
 +  // Act only on comment view displays being disabled.
 +  if ($display->isNew() || $display->getTargetEntityTypeId() != 'comment' || $display->status()) {
 +    return;
 +  }
 +  $storage = \Drupal::entityTypeManager()->getStorage('entity_view_display');
 +  if (!$storage->loadUnchanged($display->getOriginalId())->status()) {
 +    return;
 +  }
 +
 +  // Disable the comment field formatter when the used view display is disabled.
 +  foreach ($storage->loadMultiple() as $id => $view_display) {
 +    $changed = FALSE;
 +    /** @var \Drupal\Core\Entity\Display\EntityViewDisplayInterface $view_display */
 +    foreach ($view_display->getComponents() as $field => $component) {
 +      if (isset($component['type']) && ($component['type'] == 'comment_default')) {
 +        if ($component['settings']['view_mode'] == $display->getMode()) {
 +          $view_display->removeComponent($field);
 +          /** @var \Drupal\Core\Entity\EntityViewModeInterface $mode */
 +          $mode = EntityViewMode::load($display->getTargetEntityTypeId() . '.' . $display->getMode());
 +          $arguments = [
 +            '@id' => $view_display->id(),
 +            '@name' => $field,
 +            '@display' => $mode->label(),
 +            '@mode' => $display->getMode(),
 +          ];
 +          \Drupal::logger('system')->warning("View display '@id': Comment field formatter '@name' was disabled because is using the comment view display '@display' (@mode) that was just disabled.", $arguments);
 +          $changed = TRUE;
 +        }
 +      }
 +    }
 +    if ($changed) {
 +      $view_display->save();
 +    }
 +  }
 +}
diff --combined core/modules/comment/config/schema/comment.schema.yml
index a55488a,d9f5a77..0000000
--- a/core/modules/comment/config/schema/comment.schema.yml
+++ b/core/modules/comment/config/schema/comment.schema.yml
@@@ -4,9 -4,6 +4,9 @@@ field.formatter.settings.comment_defaul
    type: mapping
    label: 'Comment display format settings'
    mapping:
 +    view_mode:
 +      type: string
 +      label: 'The comment entity view mode to be used in this formatter'
      pager_id:
        type: integer
        label: 'Pager ID'
diff --combined core/modules/comment/src/Plugin/Field/FieldFormatter/CommentDefaultFormatter.php
index ad5149f,64ff301..0000000
--- a/core/modules/comment/src/Plugin/Field/FieldFormatter/CommentDefaultFormatter.php
+++ b/core/modules/comment/src/Plugin/Field/FieldFormatter/CommentDefaultFormatter.php
@@@ -8,7 -8,6 +8,7 @@@
  namespace Drupal\comment\Plugin\Field\FieldFormatter;
  
  use Drupal\comment\Plugin\Field\FieldType\CommentItemInterface;
 +use Drupal\Core\Entity\Entity\EntityViewDisplay;
  use Drupal\Core\Entity\EntityManagerInterface;
  use Drupal\Core\Entity\EntityFormBuilderInterface;
  use Drupal\Core\Field\FieldItemListInterface;
@@@ -41,7 -40,6 +41,7 @@@ class CommentDefaultFormatter extends F
     */
    public static function defaultSettings() {
      return array(
 +      'view_mode' => 'default',
        'pager_id' => 0,
      ) + parent::defaultSettings();
    }
@@@ -164,7 -162,7 +164,7 @@@
            $comments_per_page = $comment_settings['per_page'];
            $comments = $this->storage->loadThread($entity, $field_name, $mode, $comments_per_page, $this->getSetting('pager_id'));
            if ($comments) {
 -            $build = $this->viewBuilder->viewMultiple($comments);
 +            $build = $this->viewBuilder->viewMultiple($comments, $this->getSetting('view_mode'));
              $build['pager']['#type'] = 'pager';
              if ($this->getSetting('pager_id')) {
                $build['pager']['#element'] = $this->getSetting('pager_id');
@@@ -208,23 -206,6 +208,23 @@@
     */
    public function settingsForm(array $form, FormStateInterface $form_state) {
      $element = array();
 +    $view_modes = $this->getViewModes();
 +    // Only show the select element when there are more than one options.
 +    if (count($view_modes) > 1) {
 +      $element['view_mode'] = [
 +        '#type' => 'select',
 +        '#title' => $this->t('Comments view mode'),
 +        '#description' => $this->t('Select the view mode used to show the list of comments.'),
 +        '#default_value' => $this->getSetting('view_mode'),
 +        '#options' => $view_modes,
 +      ];
 +    }
 +    else {
 +      $element['view_mode'] = [
 +        '#type' => 'value',
 +        '#value' => 'default',
 +      ];
 +    }
      $element['pager_id'] = array(
        '#type' => 'select',
        '#title' => $this->t('Pager ID'),
@@@ -239,38 -220,13 +239,41 @@@
     * {@inheritdoc}
     */
    public function settingsSummary() {
-     $summary = [$this->t('Comment view mode: @mode', ['@mode' => $this->getViewModes()[$this->getSetting('view_mode')]])];
 -    // Only show a summary if we're using a non-standard pager id.
 -    if ($this->getSetting('pager_id')) {
 -      return array($this->t('Pager ID: @id', array(
 -        '@id' => $this->getSetting('pager_id'),
 -      )));
++    $view_mode = $this->getSetting('view_mode');
++    $view_modes = $this->getViewModes();
++    $view_mode_label = isset($view_modes[$view_mode]) ? $view_modes[$view_mode] : 'default';
++    $summary = [$this->t('Comment view mode: @mode', ['@mode' => $view_mode_label])];
 +    if ($pager_id = $this->getSetting('pager_id')) {
 +      $summary[] = $this->t('Pager ID: @id', ['@id' => $pager_id]);
      }
 -    return array();
 +    return $summary;
 +  }
 +
 +  /**
 +   * {@inheritdoc}
 +   */
 +  public function calculateDependencies() {
 +    $dependencies = parent::calculateDependencies();
 +    if ($mode = $this->getSetting('view_mode')) {
 +      if ($bundle = $this->getFieldSetting('comment_type')) {
 +        /** @var \Drupal\Core\Entity\Display\EntityViewDisplayInterface $display */
 +        if ($display = EntityViewDisplay::load("comment.$bundle.$mode")) {
 +          $dependencies[$display->getConfigDependencyKey()][] = $display->getConfigDependencyName();
 +        }
 +      }
 +    }
 +    return $dependencies;
 +  }
 +
 +  /**
 +   * Provides a list of comment view modes for the configured comment type.
 +   *
 +   * @return array
 +   *   Associative array keyed by view mode key and having the view mode label
 +   *   as value.
 +   */
 +  protected function getViewModes() {
 +    return $this->entityManager->getViewModeOptionsByBundle('comment', $this->getFieldSetting('comment_type'));
    }
  
  }
diff --combined core/modules/comment/src/Tests/CommentInterfaceTest.php
index bea911f,4b326a6..0000000
--- a/core/modules/comment/src/Tests/CommentInterfaceTest.php
+++ b/core/modules/comment/src/Tests/CommentInterfaceTest.php
@@@ -10,9 -10,6 +10,9 @@@ namespace Drupal\comment\Tests
  use Drupal\comment\CommentManagerInterface;
  use Drupal\comment\Plugin\Field\FieldType\CommentItemInterface;
  use Drupal\comment\Entity\Comment;
 +use Drupal\Component\Utility\Unicode;
 +use Drupal\Core\Entity\Entity\EntityViewDisplay;
 +use Drupal\Core\Entity\Entity\EntityViewMode;
  use Drupal\user\RoleInterface;
  use Drupal\filter\Entity\FilterFormat;
  
@@@ -294,54 -291,4 +294,54 @@@ class CommentInterfaceTest extends Comm
      $this->assertEqual('(No subject)', Comment::load(2)->getSubject());
    }
  
 +  /**
 +   * Tests the comment field formatter used with non-default comment entity view
 +   * mode.
 +   */
 +  public function testViewMode() {
 +    $this->drupalLogin($this->webUser);
 +    $this->drupalGet($this->node->toUrl());
 +    $comment_text = $this->randomMachineName();
 +    // Post a comment.
 +    $this->postComment($this->node, $comment_text);
 +
 +    // Comment displayed in 'default' display mode found and has body text.
 +    $comment_element = $this->cssSelect('.comment-wrapper');
 +    $this->assertTrue(!empty($comment_element));
 +    $this->assertRaw('<p>' . $comment_text . '</p>');
 +
 +    // Create a new comment entity view mode.
 +    $mode = Unicode::strtolower($this->randomMachineName());
 +    EntityViewMode::create([
 +      'targetEntityType' => 'comment',
 +      'id' => "comment.$mode",
 +    ])->save();
 +    // Create the corresponding entity view display for article node-type. Note
 +    // that this new view display mode doesn't contain the comment body.
 +    EntityViewDisplay::create([
 +      'targetEntityType' => 'comment',
 +      'bundle' => 'comment',
 +      'mode' => $mode,
 +    ])->setStatus(TRUE)->save();
 +
 +    /** @var \Drupal\Core\Entity\Display\EntityViewDisplayInterface $node_display */
 +    $node_display = EntityViewDisplay::load('node.article.default');
 +    $formatter = $node_display->getComponent('comment');
 +    // Change the node comment field formatter to use $mode mode instead of
 +    // 'default' mode.
 +    $formatter['settings']['view_mode'] = $mode;
 +    $node_display
 +      ->setComponent('comment', $formatter)
 +      ->save();
 +
 +    // Reloading the node page to show the same node with its same comment but
 +    // with a different display mode.
 +    $this->drupalGet($this->node->toUrl());
 +    // The comment should exist but without the body text because we used $mode
 +    // mode this time.
 +    $comment_element = $this->cssSelect('.comment-wrapper');
 +    $this->assertTrue(!empty($comment_element));
 +    $this->assertNoRaw('<p>' . $comment_text . '</p>');
 +  }
 +
  }
diff --combined core/modules/comment/src/Tests/CommentPagerTest.php
index 9061f64,9061f64..0000000
--- a/core/modules/comment/src/Tests/CommentPagerTest.php
+++ b/core/modules/comment/src/Tests/CommentPagerTest.php
@@@ -288,6 -288,6 +288,7 @@@ class CommentPagerTest extends CommentT
          'weight' => 30,
          'settings' => array(
            'pager_id' => 1,
++          'view_mode' => 'default',
          )
        ))
        ->save();
diff --combined core/modules/comment/src/Tests/CommentTestTrait.php
index 72c6c35,d8c54c2..0000000
--- a/core/modules/comment/src/Tests/CommentTestTrait.php
+++ b/core/modules/comment/src/Tests/CommentTestTrait.php
@@@ -34,11 -34,8 +34,11 @@@ trait CommentTestTrait 
     *   CommentItemInterface::OPEN.
     * @param string $comment_type_id
     *   (optional) ID of comment type to use. Defaults to 'comment'.
 +   * @param string $comment_view_mode
 +   *   (optional) The comment view mode to be used in comment field formatter.
 +   *   Defaults to 'full'.
     */
 -  public function addDefaultCommentField($entity_type, $bundle, $field_name = 'comment', $default_value = CommentItemInterface::OPEN, $comment_type_id = 'comment') {
 +  public function addDefaultCommentField($entity_type, $bundle, $field_name = 'comment', $default_value = CommentItemInterface::OPEN, $comment_type_id = 'comment', $comment_view_mode = 'full') {
      $entity_manager = \Drupal::entityManager();
      // Create the comment type if needed.
      $comment_type_storage = $entity_manager->getStorage('comment_type');
@@@ -114,7 -111,6 +114,7 @@@
            'label' => 'above',
            'type' => 'comment_default',
            'weight' => 20,
 +          'settings' => array('view_mode' => $comment_view_mode),
          ))
          ->save();
        foreach ($entity_manager->getViewModes($entity_type) as $id => $view_mode) {
diff --combined core/modules/forum/config/install/core.entity_view_display.node.forum.default.yml
index b157c83,39389a5..0000000
--- a/core/modules/forum/config/install/core.entity_view_display.node.forum.default.yml
+++ b/core/modules/forum/config/install/core.entity_view_display.node.forum.default.yml
@@@ -2,7 -2,6 +2,7 @@@ langcode: e
  status: true
  dependencies:
    config:
 +    - core.entity_view_display.comment.comment_forum.default
      - field.field.node.forum.body
      - field.field.node.forum.comment_forum
      - field.field.node.forum.taxonomy_forums
@@@ -27,7 -26,6 +27,7 @@@ content
      type: comment_default
      weight: 20
      settings:
 +      view_mode: default
        pager_id: 0
      third_party_settings: {  }
    links:
diff --combined core/profiles/standard/config/install/core.entity_view_display.node.article.default.yml
index ca59894,e0d3782..0000000
--- a/core/profiles/standard/config/install/core.entity_view_display.node.article.default.yml
+++ b/core/profiles/standard/config/install/core.entity_view_display.node.article.default.yml
@@@ -2,7 -2,6 +2,7 @@@ langcode: e
  status: true
  dependencies:
    config:
 +    - core.entity_view_display.comment.comment.default
      - field.field.node.article.body
      - field.field.node.article.comment
      - field.field.node.article.field_image
@@@ -25,11 -24,10 +25,11 @@@ content
      third_party_settings: {  }
      label: hidden
    comment:
 -    label: above
      type: comment_default
 -    weight: 20
 +    weight: 110
 +    label: above
      settings:
 +      view_mode: default
        pager_id: 0
      third_party_settings: {  }
    field_image:
@@@ -47,6 -45,13 +47,6 @@@
      settings:
        link: true
      third_party_settings: {  }
 -  comment:
 -    label: above
 -    type: comment_default
 -    weight: 110
 -    settings:
 -      pager_id: 0
 -    third_party_settings: {  }
    links:
      weight: 100
  hidden:
diff --git a/core/modules/comment/src/Tests/Update/CommentUpdateTest.php b/core/modules/comment/src/Tests/Update/CommentUpdateTest.php
new file mode 100644
index 0000000..db1cb43
--- /dev/null
+++ b/core/modules/comment/src/Tests/Update/CommentUpdateTest.php
@@ -0,0 +1,47 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\comment\Tests\Update\CommentUpdateTest.
+ */
+
+namespace Drupal\comment\Tests\Update;
+
+use Drupal\system\Tests\Update\UpdatePathTestBase;
+
+/**
+ * Tests that comment settings are properly updated during database updates.
+ *
+ * @group comment
+ */
+class CommentUpdateTest extends UpdatePathTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setDatabaseDumpFiles() {
+    $this->databaseDumpFiles = [
+      __DIR__ . '/../../../../system/tests/fixtures/update/drupal-8-rc1.bare.standard.php.gz',
+    ];
+  }
+
+  /**
+   * Tests comment_update_8101().
+   *
+   * @see comment_update_8101()
+   */
+  public function testCommentUpdate8101() {
+    // Load the 'node.article.default' entity view display config, and check
+    // that component 'comment' does not contain the 'view_mode' setting.
+    $config = $this->config('core.entity_view_display.node.article.default');
+    $this->assertNull($config->get('content.comment.settings.view_mode'));
+
+    // Run updates.
+    $this->runUpdates();
+
+    // Reload the config, and check that 'view_mode' has the value 'default'.
+    $config = $this->config('core.entity_view_display.node.article.default');
+    $this->assertIdentical($config->get('content.comment.settings.view_mode'), 'default');
+  }
+
+}
diff --git a/core/modules/comment/tests/src/Kernel/CommentIntegrationTest.php b/core/modules/comment/tests/src/Kernel/CommentIntegrationTest.php
new file mode 100644
index 0000000..efde8dd
--- /dev/null
+++ b/core/modules/comment/tests/src/Kernel/CommentIntegrationTest.php
@@ -0,0 +1,142 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Tests\comment\Kernel\CommentIntegrationTest.
+ */
+
+namespace Drupal\Tests\comment\Kernel;
+
+use Drupal\comment\Entity\CommentType;
+use Drupal\Component\Utility\Unicode;
+use Drupal\Core\Database\Database;
+use Drupal\Core\Entity\Entity\EntityViewDisplay;
+use Drupal\Core\Entity\Entity\EntityViewMode;
+use Drupal\field\Entity\FieldConfig;
+use Drupal\field\Entity\FieldStorageConfig;
+use Drupal\KernelTests\KernelTestBase;
+
+/**
+ * Tests integration of comment with other components.
+ *
+ * @group comment
+ */
+class CommentIntegrationTest extends KernelTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['comment', 'field', 'entity_test', 'user', 'system', 'dblog'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+    $this->installEntitySchema('entity_test');
+    $this->installEntitySchema('user');
+    $this->installEntitySchema('comment');
+    $this->installSchema('dblog', ['watchdog']);
+
+    // Create a new 'comment' comment-type.
+    CommentType::create([
+      'id' => 'comment',
+      'label' => $this->randomString(),
+    ])->save();
+  }
+
+  /**
+   * Tests view mode setting integration.
+   *
+   * @see comment_entity_view_display_presave()
+   * @see CommentDefaultFormatter::calculateDependencies()
+   */
+  public function testViewMode() {
+    $mode = Unicode::strtolower($this->randomMachineName());
+    // Create a new comment view mode and a view display entity.
+    EntityViewMode::create([
+      'id' => "comment.$mode",
+      'targetEntityType' => 'comment',
+      'settings' => ['comment_type' => 'comment'],
+    ])->save();
+    EntityViewDisplay::create([
+      'targetEntityType' => 'comment',
+      'bundle' => 'comment',
+      'mode' => $mode,
+    ])->setStatus(TRUE)->save();
+
+    // Create a comment field attached to a host 'entity_test' entity.
+    FieldStorageConfig::create([
+      'entity_type' => 'entity_test',
+      'type' => 'comment',
+      'field_name' => $field_name = Unicode::strtolower($this->randomMachineName()),
+      'settings' => [
+        'comment_type' => 'comment',
+      ],
+    ])->save();
+    FieldConfig::create([
+      'entity_type' => 'entity_test',
+      'bundle' => 'entity_test',
+      'field_name' => $field_name,
+    ])->save();
+
+    $component = [
+      'type' => 'comment_default',
+      'settings' => ['view_mode' => $mode, 'pager_id' => 0],
+    ];
+    // Create a new 'entity_test' view display on host entity that uses the
+    // custom comment display in field formatter to show the field.
+    EntityViewDisplay::create([
+      'targetEntityType' => 'entity_test',
+      'bundle' => 'entity_test',
+      'mode' => 'default'
+    ])->setComponent($field_name, $component)->setStatus(TRUE)->save();
+
+    $host_display_id = 'entity_test.entity_test.default';
+    $comment_display_id = "comment.comment.$mode";
+
+    // Disable the "comment.comment.$mode" display.
+    EntityViewDisplay::load($comment_display_id)->setStatus(FALSE)->save();
+
+    /** @var \Drupal\Core\Entity\Display\EntityViewDisplayInterface $host_display */
+    $host_display = EntityViewDisplay::load($host_display_id);
+
+    // Check that the field formatter has been disabled on host view display.
+    $this->assertNull($host_display->getComponent($field_name));
+    $this->assertTrue($host_display->get('hidden')[$field_name]);
+
+    // Check that the proper warning has been logged.
+    $arguments = [
+      '@id' => $host_display_id,
+      '@name' => $field_name,
+      '@display' => EntityViewMode::load("comment.$mode")->label(),
+      '@mode' => $mode,
+    ];
+    $logged = (bool) Database::getConnection()->select('watchdog')
+      ->fields('watchdog', ['wid'])
+      ->condition('type', 'system')
+      ->condition('message', "View display '@id': Comment field formatter '@name' was disabled because is using the comment view display '@display' (@mode) that was just disabled.")
+      ->condition('variables', serialize($arguments))
+      ->execute()
+      ->fetchField();
+
+    // Re-enable the comment view display.
+    EntityViewDisplay::load($comment_display_id)->setStatus(TRUE)->save();
+    // Re-enable the comment field formatter on host entity view display.
+    EntityViewDisplay::load($host_display_id)->setComponent($field_name, $component)->save();
+
+    // Delete the "comment.$mode" view mode.
+    EntityViewMode::load("comment.$mode")->delete();
+
+    // Check that the comment view display entity has been deleted too.
+    $this->assertNull(EntityViewDisplay::load($comment_display_id));
+
+    /** @var \Drupal\Core\Entity\Display\EntityViewDisplayInterface $display */
+    $host_display = EntityViewDisplay::load($host_display_id);
+
+    // Check that the field formatter has been disabled on host view display.
+    $this->assertNull($host_display->getComponent($field_name));
+    $this->assertTrue($host_display->get('hidden')[$field_name]);
+  }
+
+}