[Bug 104531] Cannot turn monitor off over DP cable

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=104531

--- Comment #8 from Parag <parag.warudkar@gmail.com> ---
(In reply to Marcin Deranek from comment #6)
> It looks like this might be chipset/firmware specific.
> 
> I had this problem with MSI R9 270 Gaming 2G
> (https://www.msi.com/Graphics-card/R9-270-GAMING-2G.html) which broke last
> week (I couldn't power on computer). I replaced it with Sapphire Nitro+
> Radeon RX580 8GB GDDR5
> (http://www.sapphiretech.com/productdetial.asp?pid=B66182B7-1EA6-42A9-8762-
> FCCE003B491A&lang=eng) which does not exhibit this behaviour even though the
> rest of the system is the same: same hardware, same OS.
> 
> Now when running:
> sleep 5; xset dpms force off
> 
> monitor goes permanently into sleep.

Just to add a data point - problem card in my case is a XFX Radeon RX 560. 
1xDP 1xHDMI outputs - disconnecting the DP cable from one monitor doesn't help
- same issue with single monitor over HDMI.

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