kobo/koreader.sh: fix rotation issue caused by koreader#2731

platform/kobo/koreader.sh

@@ -117,19 +117,29 @@ if [ -e crash.log ]; then
 	mv -f crash.log.new crash.log
 fi
 
+# workaround 32-bit without KSM
+if [ -z ${ksmroot+x} ]; then
 # TODO: add support for 32bit framebuffer in koreader. This is a workaround
 # to run koreader in 16bpp. Useful since FW 4.0
+CUR_ROTATE="$(cat "/sys/class/graphics/fb0/rotate")"
 FB_BPP=$(cat /sys/class/graphics/fb0/bits_per_pixel)
 [ "$FB_BPP" -gt 16 ] && /usr/sbin/fbset -depth 16
-# fix rotation issues on Kobo Aura HD (dragon) and Kobo Aura H2O (dahlia)
+# this suffices on normal devices, but H2O is stupid and sets the opposite
+echo "${CUR_ROTATE}" > "/sys/class/graphics/fb0/rotate"
+# this therefore turns it around on H2O (and other potential idiots) and merely
+# innocently repeats on sane devices
 # shellcheck disable=SC2094
-case "$PRODUCT" in "dragon" | "dahlia" ) cat /sys/class/graphics/fb0/rotate > /sys/class/graphics/fb0/rotate ;; esac
+cat "/sys/class/graphics/fb0/rotate" > "/sys/class/graphics/fb0/rotate"
+fi
 
 ./reader.lua "${args}" >> crash.log 2>&1
 RESULT=$?
 
+# workaround 32-bit without KSM
+if [ -z ${ksmroot+x} ]; then
 # back to default depth in framebuffer.
 [ "$FB_BPP" -gt 16 ] && /usr/sbin/fbset -depth "$FB_BPP"
+fi
 
 if [ "${FROM_NICKEL}" = "true" ] ; then
 	if [ "${FROM_KFMON}" != "true" ] ; then