gnu: xorg-server: Apply patch to fix screen rotation on KMS.

Fixes <https://bugs.freedesktop.org/show_bug.cgi?id=106715>.

* gnu/packages/patches/xorg-server-rotate-fb.patch: New file.
* gnu/packages/xorg.scm (xorg-server)[source]: Use it.
* gnu/local.mk (dist_patch_DATA): Add it.

gnu/local.mk

@@ -1234,6 +1234,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/xinetd-fix-fd-leak.patch			\
   %D%/packages/patches/xinetd-CVE-2013-4342.patch		\
   %D%/packages/patches/xmodmap-asprintf.patch 			\
+  %D%/packages/patches/xorg-server-rotate-fb.patch		\
   %D%/packages/patches/zathura-pdf-mupdf-link-to-jpeg-libraries.patch \
   %D%/packages/patches/zathura-plugindir-environment-variable.patch	\
   %D%/packages/patches/zstd-fix-stdin-list-without-tty.patch	\

gnu/packages/patches/xorg-server-rotate-fb.patch

@@ -0,0 +1,35 @@
+commit a85e94a50c94b07574c8701a3ff3c1243f4257f4
+Author: Olivier Fourdan <ofourdan@redhat.com>
+Date:   Fri Jun 15 08:57:12 2018 +0200
+
+    modesetting: use drmmode_bo_import() for rotate_fb
+    
+    drmmode_shadow_allocate() still uses drmModeAddFB() which may fail if
+    the format is not as expected, preventing from using a rotated output.
+    
+    Change it to use the new function drmmode_bo_import() which takes care
+    of calling the drmModeAddFB2() API.
+    
+    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=106715
+    Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
+    Tested-by: Tomas Pelka <tpelka@redhat.com>
+    Reviewed-by: Lyude Paul <lyude@redhat.com>
+
+diff --git a/hw/xfree86/drivers/modesetting/drmmode_display.c b/hw/xfree86/drivers/modesetting/drmmode_display.c
+index 859a21a9d..ec11b3f56 100644
+--- a/hw/xfree86/drivers/modesetting/drmmode_display.c
++++ b/hw/xfree86/drivers/modesetting/drmmode_display.c
+@@ -1794,11 +1794,8 @@ drmmode_shadow_allocate(xf86CrtcPtr crtc, int width, int height)
+         return NULL;
+     }
+ 
+-    ret = drmModeAddFB(drmmode->fd, width, height, crtc->scrn->depth,
+-                       drmmode->kbpp,
+-                       drmmode_bo_get_pitch(&drmmode_crtc->rotate_bo),
+-                       drmmode_bo_get_handle(&drmmode_crtc->rotate_bo),
+-                       &drmmode_crtc->rotate_fb_id);
++    ret = drmmode_bo_import(drmmode, &drmmode_crtc->rotate_bo,
++                            &drmmode_crtc->rotate_fb_id);
+ 
+     if (ret) {
+         ErrorF("failed to add rotate fb\n");

gnu/packages/xorg.scm

@@ -5093,7 +5093,8 @@ over Xlib, including:
             (sha256
              (base32
               "0mm70y058r8s9y9jiv7q2myv0ycnaw3iqzm7d274410s0ik38w7q"))
-            (file-name "xorg-server-use-intel-only-on-pre-gen4.diff"))))))
+            (file-name "xorg-server-use-intel-only-on-pre-gen4.diff"))
+          (search-patch "xorg-server-rotate-fb.patch")))))
     (build-system gnu-build-system)
     (propagated-inputs
       `(("libpciaccess" ,libpciaccess)