I'm having trouble switching to the discrete graphics on Ubuntu 14.04.
First about my system:
- Model: HP Pavilion dv6
- CPU: Intel Core i7-2670QM CPU @ 2.20GHz
- Memory: 6GB
- Graphics card: Radeon HD 6400M/7400M series (could not find out the exact model)
- OS: Ubuntu 14.04.3 LTS
What I tried:
(At first I shut down the X-server with
I originally tried to switch to my Radeon graphics card instead of the integrated unit.
My graphics devices are:
>>> lspci -vnn | grep '\''[030\]' 00:02.0 VGA compatible controller : Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller]) 01:00.0 VGA compatible controller : Advanced Micro Devices, Inc. [AMD/ATI] Seymour [Radeon HD 6400M/7400M Series] [1002:6760] (rev ff) (prog-if ff)
I tried switching devices using
/sys/kernel/debug/vgaswitcheroo/switch (following this article: https://help.ubuntu.com/community/HybridGraphics ). I obtained:
>>> cat /sys/kernel/debug/vgaswitcheroo/switch 0:IGD:+:Pwr:0000:00:02.0 1:DIS: :DynOff:0000:01:00.0
echo ON > /sys/kernel/debug/vgaswitcheroo/switch didn't change anything so I went to BIOS and changed
Switchable Graphics Mode to
Fixed (following http://support.hp.com/us-en/document/c02948560 ) and because there was still no change I added
GRUB_CMDLINE_LINUX_DEFAULT= (following http://iswwwup.com/t/3a156248c627/ati-vgaswitcheroo-doesnt-work-on-14-04-discrete-radeon-always-on-dell-vost.html ).
After rebooting I obtained:
>>> cat /sys/kernel/debug/vgaswitcheroo/switch 0:IGD:+:Pwr:0000:00:02.0 1:DIS: :Pwr:0000:01:00.0
echo DIS > /sys/kernel/debug/vgaswitcheroo/switch now caused the screen to turn black and didn't show any ouput. However I was able to check the content of
/sys/kernel/debug/vgaswitcheroo/switch by copying it to a file and then switching back to integrated graphics. The content was:
>>> cat /sys/kernel/debug/vgaswitcheroo/switch 0:IGD: :Off:0000:00:02.0 1:DIS:+:Pwr:0000:01:00.0
So apparently the Radeon card was powered and active but didn't output anything. I observed the same behaviour when having an external screen connected both via VGA and HDMI.
(Side note: switching back to integrated graphics via
echo IGD > /sys/kernel/debug/vgaswitcheroo/switch gave as output
[ 956.727633] [drm:rv770_stop_dpm] *ERROR* Could not force DPM to low. (probably due to the
radeon.runpm=0 which I added before); however the
/sys/kernel/debug/vgaswitcheroo/switch wasn't available anymore (I couldn't issue any further commands) and
lspci -vnn | grep '\''[030\]' didn't list the Radeon anymore.)
So I thought the problem might be a missing driver.
About the AMD driver:
I checked the AMD website for an Ubuntu driver and found the following: http://support.amd.com/en-us/download/desktop?os=Linux+x86
I followed the installation manual (http://www2.ati.com/drivers/amd-catalyst-graphics-driver-installer-notes-for-linux-operating-systems.pdf ; none of
fglrx-dev was already installed) but encountered an error when installing
fglrx-core: there was a conflict with
libopencl1. I followed this workaround: 14.10 wine and fglrx conflict and modified
Provides as described, then the installation of the above packages finished without error. Also, as described in the workaround, I did
apt-get install fglrx-updates. However after rebooting the system told me
The system is running in low-graphics mode - Your screen, graphics card, and input device settings could not be detected correctly. You will need to configure there yourself.
I used the console log-in to remove the previously installed packages but the graphics still don't work.
To summarize the question:
What do I have to do in order to manually switch to the Radeon graphics card using Ubuntu 14.04? In case I need to install the above mentioned driver is the conflict with libopencl1 a problem and if so how I can work around this? Also, how can I get the X-server back working?
Thanks a lot in advance! Cheers!
/var/log/Xorg.failsafe.log. Here are the links:
From the low-graphics dialogue I selected "restore default graphics settings" and now the X-server is back working. But with the integrated graphics, of course.