Re: Mobility Radeon HD 4530/4570/545v: flicker in 1920x1080

From: Christian KÃnig
Date: Sat Oct 31 2015 - 17:53:31 EST

On 31.10.2015 21:13, Pavel Machek wrote:

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@half:~$ 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@half:~$ xrandr --output VGA-0 --mode 1600x1200
pavel@half:~$ xrandr --output VGA-0 --mode 1920x1080
pavel@half:~$ 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?

Alex probably knows more about this, but it sounds like problems with switching the memory clocks on 3D load.

Try to disable power management completely with radeon.dpm=0 on the kernel command line or nailing the hardware at a specific power level using sysfs.

Power consumption would be totally awkward, but it should help nailing down the problem.



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