Merge pull request #1928 from Hzj-jie/fl-fix

Koreader won't start on Kobo without frontlight, powerd.fl may be nil.

reader.lua

@@ -117,22 +117,24 @@ end
 
 -- restore kobo frontlight settings and probe kobo touch coordinates
 if Device:isKobo() then
-    local powerd = Device:getPowerDevice()
-    if powerd and powerd.restore_settings then
-        -- UIManager:init() should have sanely set up the frontlight_stuff by this point
-        local intensity = G_reader_settings:readSetting("frontlight_intensity")
-        powerd.fl_intensity = intensity or powerd.fl_intensity
-        local is_frontlight_on = G_reader_settings:readSetting("is_frontlight_on")
-        if is_frontlight_on then
-            -- default powerd.is_fl_on is false, turn it on
-            powerd:toggleFrontlight()
-        else
-            -- the light can still be turned on manually outside of koreader
-            -- or nickel. so we always set the intensity to 0 here to keep it
-            -- in sync with powerd.is_fl_on (false by default)
-            -- NOTE: we cant use setIntensity method here because for kobo the
-            -- min intensity is 1 :(
-            powerd.fl:setBrightness(0)
+    if Device.hasFrontlight then
+        local powerd = Device:getPowerDevice()
+        if powerd and powerd.restore_settings then
+            -- UIManager:init() should have sanely set up the frontlight_stuff by this point
+            local intensity = G_reader_settings:readSetting("frontlight_intensity")
+            powerd.fl_intensity = intensity or powerd.fl_intensity
+            local is_frontlight_on = G_reader_settings:readSetting("is_frontlight_on")
+            if is_frontlight_on then
+                -- default powerd.is_fl_on is false, turn it on
+                powerd:toggleFrontlight()
+            else
+                -- the light can still be turned on manually outside of koreader
+                -- or nickel. so we always set the intensity to 0 here to keep it
+                -- in sync with powerd.is_fl_on (false by default)
+                -- NOTE: we cant use setIntensity method here because for kobo the
+                -- min intensity is 1 :(
+                powerd.fl:setBrightness(0)
+            end
         end
     end
     if Device:getCodeName() == "trilogy" then