[Bug 55121] Limited color range on screen that is connected via HDMI [SandyBridge]

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=55121





--- Comment #4 from Ivan Bulatovic <combuster at archlinux.us>  2013-03-18 20:48:03 ---
Here is the section regarding HDMI black levels from monitor manual:

HDMI Black Level When watching with a DVD or set-top box connecting to the
product via HDMI, image quality deterioration (black level, lower-quality
contrast, lighter color tone, etc.) may occur depending on the connected
external device.
•<Normal>
•<Low>
This function is active only when the external device is connected via <HDMI>.
The <HDMI Black Level> function may not be compatible with all external
devices.

It defaults to Normal (AFAIK it represents the full range mode) and it worked
before this commit.

So, somehow "Automatic" mode for the "Broadcast RGB" property defaults to
limited range output even though full range mode is supported.

Thanks for the explanation Daniel, I had the missfortune to step on more than a
few landmines that OEM's layed out _strictly_ following "standard" specs (ie
ACPI tables) so I'll guess I will just wait and keep an eye out for any patches
regarding this commit and report back if anything changes.

If Ville wants to have any patches tested against this exact case before hiting
mainline I would be glad to help out.

Best regards !

-- 
Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are on the CC list for the bug.
You are the assignee for the bug.