I would like to use my 40" 4k monitor (Philips BDM4065UC) alongside with two others WUXGA monitors (Dell U2412M).
I can successfully run :
- my main 4k alone at 3840x2160@60Hz,
- or my main 4k at 2560x1440@60Hz with the two others monitors at 1920x1200@60.
As soon as, I try to increase the resolution of my main monitor to 3840x2160 with the two others monitors :
- all the windows of the 4k monitors are grayed out,
- the two others monitors are working correctly,
- the mouse on the 4k monitor is still working,
- I can move windows in and out my 4k screen but I can't see them displayed on the 4k screen.
This setup works correctly on windows.
My setup :
- Graphic card : AMD Radeon R7 250X (same issue with 59 280X)
- Driver : radeon (open source, don't want to use fglrx as I only do 2D stuffs)
- Xubuntu 14.04
- Kernel : 3.19.0-22-generic(tried also with 3.16)
- Windows manager : Awesome WM
My configuration files :
Script 1 : xrandr script that fails :
xrandr --output DisplayPort-0 --pos 1200x0 --rotate normal --rate 60 --mode 3840x2160 --primary && \
xrandr --output HDMI-0 --auto --rotate left --pos 0x0 && \
xrandr --output DVI-0 --rate 60 --mode 1920x1200 --pos 5040x0 --rotate left
Script 2 : xrandr script that "works" :
xrandr --output DisplayPort-0 --pos 1200x0 --rotate normal --rate 60 --mode 2560x1440 --primary && \
xrandr --output HDMI-0 --auto --rotate left --pos 0x0 && \
xrandr --output DVI-0 --rate 60 --mode 1920x1200 --pos 5040x0 --rotate left
My logs files:
I have no errors in /var/log/Xorg.0.log.
However when digging in /var/log/syslog, I can see some errors (but are not always reproducible) :
when running Script 1 :
pcp kernel: [ 6337.304231] radeon 0000:04:00.0: ffff880390d22800 pin failed
pcp kernel: [ 6337.304231] radeon 0000:04:00.0: ffff880390d22800 pin failed
pcp kernel: [ 6337.350587] radeon 0000:04:00.0: ffff880390d22800 pin failed
pcp kernel: [ 6337.350587] radeon 0000:04:00.0: ffff880390d22800 pin failed
when running Script 2 :
pcp kernel: [ 6377.757518] radeon 0000:04:00.0: ffff880390d22800 unpin not necessary
pcp kernel: [ 6377.757518] radeon 0000:04:00.0: ffff880390d22800 unpin not necessary
It seems to be a kernel or driver issue, but I don't know where to start to debug this.
Unsuccessfull solutions:
1/ use a more powerful graphic gard : Radeon R9 280X (note: this works on windows)
2/ use a more recent kernel (3.19.0-22-generic instead of 3.16)
sudo apt-get install linux-generic-lts-vivid
sudo update-grub
3/ use a static Xorg configuration file in [/etc/X11/xorg.conf](http://paste.ubuntu.com/11914522/ )
4/ use an updated radeon driver
sudo add-apt-repository ppa:oibaf/graphics-drivers && sudo aptitude update && sudo aptitude upgrade
then removed with
sudo apt-get install ppa-purge && sudo ppa-purge ppa:oibaf/graphics-drivers && supo aptitude update && sudo aptitude upgrade
5/ upgrade to Xubuntu 15.05
same problem, even with kernel 4.0, or latest xorg / ATI packages
6/ test others distributions Mint, Debian
Partially successfull solutions:
1/ I finally give a try to the proprieratery driver. I followed the installation instructions.
The all 3 monitors are now using the appropriate screen resolutions.
However, this is now so slooow, moving the mouse is very lagguy, opening two terminal windows takes 5 seconds...
Definitly unusable...
Any hints are welcome,
Regards,
