Am 15.05.2013 15:00, schrieb Alex Deucher:
On Tue, May 14, 2013 at 9:23 PM, Dave Airlie <airl...@gmail.com> wrote:
From: Dave Airlie <airl...@redhat.com>

When UMS was deprecated it removed support for nomodeset commandline
we really want this in distro land so we can debug stuff, everyone
should fallback to vesa correctly.

v2: oops -1 isn't used anymore, restore original behaviour
-1 is default, so we can boot with nomodeset on the command line,
then use radeon.modeset=1 to override it for debugging later.

Cc: sta...@vger.kernel.org
Signed-off-by: Dave Airlie <airl...@redhat.com>
Whoops.  Looks good to me.  Do you want me take this patch through my
tree or do you want to apply it?

Reviewed-by: Alex Deucher <alexander.deuc...@amd.com>

I was really wondering what that code does exactly while removing it, now I know. Patch is:

Reviewed-by: Christian König <christian.koe...@amd.com>



---
  drivers/gpu/drm/radeon/radeon_drv.c | 12 +++++++++++-
  1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/radeon/radeon_drv.c 
b/drivers/gpu/drm/radeon/radeon_drv.c
index d33f484..094e7e5 100644
--- a/drivers/gpu/drm/radeon/radeon_drv.c
+++ b/drivers/gpu/drm/radeon/radeon_drv.c
@@ -147,7 +147,7 @@ static inline void radeon_unregister_atpx_handler(void) {}
  #endif

  int radeon_no_wb;
-int radeon_modeset = 1;
+int radeon_modeset = -1;
  int radeon_dynclks = -1;
  int radeon_r4xx_atom = 0;
  int radeon_agpmode = 0;
@@ -456,6 +456,16 @@ static struct pci_driver radeon_kms_pci_driver = {

  static int __init radeon_init(void)
  {
+#ifdef CONFIG_VGA_CONSOLE
+       if (vgacon_text_force() && radeon_modeset == -1) {
+               DRM_INFO("VGACON disable radeon kernel modesetting.\n");
+               radeon_modeset = 0;
+       }
+#endif
+       /* set to modesetting by default if not nomodeset */
+       if (radeon_modeset == -1)
+               radeon_modeset = 1;
+
         if (radeon_modeset == 1) {
                 DRM_INFO("radeon kernel modesetting enabled.\n");
                 driver = &kms_driver;
--
1.8.1.2

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