drm/radeon: set default bl level to something reasonable

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If the value in the scratch register is 0, set it to the
max level.  This fixes an issue where the console fb blanking
code calls back into the backlight driver on unblank and then
sets the backlight level to 0 after the driver has already
set the mode and enabled the backlight.

bugs:
https://bugs.freedesktop.org/show_bug.cgi?id=81382
https://bugs.freedesktop.org/show_bug.cgi?id=70207

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Tested-by: David Heidelberger <david.heidelberger@ixit.cz>
Cc: stable@vger.kernel.org

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This commit is contained in:

Alex Deucher 2014-07-15 09:48:53 -04:00

parent 0ac66effe7

commit 201bb62402

1 changed files with 7 additions and 3 deletions

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drivers/gpu/drm/radeon/atombios_encoders.c

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