linux-kernel - Mobility Radeon HD 4530/4570/545v: flicker in 1920x1080

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Date:	Sat, 31 Oct 2015 21:13:44 +0100
From:	Pavel Machek <pavel@....cz>
To:	alexander.deucher@....com, christian.koenig@....com,
	dri-devel@...ts.freedesktop.org,
	kernel list <linux-kernel@...r.kernel.org>,
	linux-fbdev@...r.kernel.org
Subject: Mobility Radeon HD 4530/4570/545v: flicker in 1920x1080

Hi!

4.3-rc7 kernel, graphics works reasonably well in 1600x1200 mode. But
my monitor is native 1920x1080, so that mode looks pretty ugly on
screen. If I go to 1920x1080, I see colored horizontal lines (often
black) as soon as there's graphics activity.

pavel@...f:~$ xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
VGA-0 connected 1920x1080+0+0 (normal left inverted right x axis y
axis) 478mm x 268mm
   1920x1080     60.00*+
      1600x1200     60.00
         1680x1050     59.95
	    1280x1024     75.02    60.02
	       1440x900      59.89
	          1024x768      75.08    60.00
		     800x600       75.00    60.32
		        640x480       75.00    60.00
			   720x400       70.08
 pavel@...f:~$ xrandr --output VGA-0 --mode 1600x1200
 pavel@...f:~$ xrandr --output VGA-0 --mode 1920x1080
 pavel@...f:~$ xrandr --output VGA-0 --mode 1600x1200

This is Acer notebook,

01:00.0 VGA compatible controller: Advanced Micro Devices,
Inc. [AMD/ATI] RV710/M92 [Mobility Radeon HD 4530/4570/545v]

Ouch, and power consumption seems to be 8W too high. (25W instead of
17W), I believe it started when I added radeon firmware, but will
check. It does not go lower even when I switch to text console.

Any ideas?

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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