[Bug 83021] Brightness is automatically set to zero when switching from X session to tty

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=83021

Jani Nikula <jani.nikula at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #2 from Jani Nikula <jani.nikula at intel.com> ---
1) Please attach dmesg with drm.debug=0xe module param set all the way from
boot to the problem.

2) Please try this patch:

diff --git a/drivers/gpu/drm/i915/intel_panel.c
b/drivers/gpu/drm/i915/intel_panel.c
index 59b028f0b1e8..ad2bbf1ae090 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -946,7 +946,8 @@ void intel_panel_enable_backlight(struct intel_connector
*connector)

     WARN_ON(panel->backlight.max == 0);

-    if (panel->backlight.level == 0) {
+    if (panel->backlight.level == 0 ||
+        panel->backlight.level < panel->backlight.min) {
         panel->backlight.level = panel->backlight.max;
         if (panel->backlight.device)
             panel->backlight.device->props.brightness =

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