[NiLuJe]

Originally Posted by NiLuJe

(i.e., does this *actually* rotate the framebuffer in some way, or does Nickel handle rotation entirely in software on that device).

It does do a HW rotate to CCW (canonical) on a H2O, FWIW.

In which case... does this patch fix it?

diff --git a/fbink_device_id.c b/fbink_device_id.c
index c324c0c..9a10530 100644
--- a/fbink_device_id.c
+++ b/fbink_device_id.c
@@ -644,8 +644,14 @@ static void
                        strtcpy(deviceQuirks.devicePlatform, "Mark 4", sizeof(deviceQuirks.devicePlatform));
                        break;
                case DEVICE_KOBO_GLO:    // Glo (kraken)
-                       deviceQuirks.isKoboNonMT = true;
-                       deviceQuirks.screenDPI   = 212U;
+                       deviceQuirks.isKoboNonMT                = true;
+                       // {3, 2, 1, 0}, but no ioctl quirks
+                       deviceQuirks.ntxRotaQuirk               = NTX_ROTA_CCW_TOUCH;
+                       deviceQuirks.rotationMap[FB_ROTATE_UR]  = FB_ROTATE_CCW;
+                       deviceQuirks.rotationMap[FB_ROTATE_CW]  = FB_ROTATE_UD;
+                       deviceQuirks.rotationMap[FB_ROTATE_UD]  = FB_ROTATE_CW;
+                       deviceQuirks.rotationMap[FB_ROTATE_CCW] = FB_ROTATE_UR;
+                       deviceQuirks.screenDPI                  = 212U;
                        strtcpy(deviceQuirks.deviceName, "Glo", sizeof(deviceQuirks.deviceName));
                        strtcpy(deviceQuirks.deviceCodename, "Kraken", sizeof(deviceQuirks.deviceCodename));
                        strtcpy(deviceQuirks.devicePlatform, "Mark 4", sizeof(deviceQuirks.devicePlatform));

(Ideally, without breaking other rotations ;p. i.e., check `ftrace` in each rotation: `fbdepth -R UR` then `-R CW` -> `-R UD` -> `-R CCW`).

Keep in mind it means rotating the *device* itself, not the buffer. e.g., what Nickel does for landscape for me is a CCW rotate.