Don't know if it helps, but I ran DRI_PRIME=1 glxinfo|grep "OpenGL renderer".
Seems like the only way to get some reaction from the dedicated one other than
black screen.
Attached dmesg output about this.
** Attachment added: "dmesg.txt"
Would like to join in on this bug.
I have a laptop with Intel Haswell and AMD Radeon HD 8850M / R9 M265X. I can't
change to the dedicated GPU no matter how I try. My error messages in dmesg are
basically the same as mentioned above.
Also, when I stop lightdm I get the title error: [drm:si_resume
Some news.
I updated the kernel to 4.4.13. Now I don't have error messages is dmesg.
Added radeon.dpm=1 radeon.modeset=1 to /etc/default/grub file (not sure if
everything is needed).
sudo update-grub and reboot
Although I still cannot switch between the cards with DDIS, but I can run
specific
"Tenten36 (tenten) wrote on 2016-07-27:
The problem still exists with kernel 4.6 and 4.7 from the mainline
build.
$ DRI_PRIME=1 glxgears
gives black screen"
That seems like a regression or the newest kernels weren't patched.
Currently using 4.4.14 and it still works.
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