diff options
| author | Lukas Wunner <lukas@wunner.de> | 2016-01-11 20:09:20 +0100 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2016-02-09 11:21:13 +0100 |
| commit | 14d2000182ed1cb6baf0fe8dc60a3664a832fc01 (patch) | |
| tree | 85c76872f03787dae8994dfe6874c4edf0cfbf6a /certs | |
| parent | 98b3a3402eb6e38c3bf5dd4281e60e1f186f0041 (diff) | |
drm/radeon: Defer probe if gmux is present but its driver isn't
gmux is a microcontroller built into dual GPU MacBook Pros.
On pre-retina MBPs, if we're the inactive GPU, we need apple-gmux
to temporarily switch DDC so that we can probe the panel's EDID.
The checks for CONFIG_VGA_ARB and CONFIG_VGA_SWITCHEROO are necessary
because if either of them is disabled but gmux is present, the driver
would never load, even if we're the active GPU. (vga_default_device()
would evaluate to NULL and vga_switcheroo_handler_flags() would
evaluate to 0.)
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=61115
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/552da6d85a82092146af7b0693595fa2a9ea376b.1452525860.git.lukas@wunner.de
Diffstat (limited to 'certs')
0 files changed, 0 insertions, 0 deletions