On Mon, 23 Feb 2015, Michael Leuchtenburg <michael@xxxxxxxxxxxxx> wrote: > I'm certain that it has dynamic backlight control of some sort, as the > brightness varies based on content. I'm also sure it has an eDP panel, and > an Intel graphics adapter. I'm not certain that DPCD will let me adjust it, > or how to check, though the ChromeOS patch seems to assume that intel + edp > -> DBC adjustable via DPCD. I just sent a patch to dump the DPCD in debugfs [1]. Please apply that on top of v4.0-rc1 or drm-intel-nightly, *and* add the following patch on top. Please share the contents of /sys/kernel/debug/dri/0/eDP-1/i915_dpcd running that (I assume the name will be eDP-1). BR, Jani. [1] http://patchwork.freedesktop.org/patch/43332 diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c index 451ef456c25f..c66b0679d6e2 100644 --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -4672,6 +4672,9 @@ static const struct dpcd_block i915_dpcd_debug[] = { { .offset = DP_SINK_COUNT, .end = DP_ADJUST_REQUEST_LANE2_3 }, { .offset = DP_SET_POWER }, { .offset = DP_EDP_DPCD_REV }, + { .offset = 0x701, .end = 0x704 }, + { .offset = 0x720, .end = 0x72f }, + { .offset = 0x732, .end = 0x733 }, }; static int i915_dpcd_show(struct seq_file *m, void *data) -- Jani Nikula, Intel Open Source Technology Center _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
