[PATCH 1/4] gpu/vga_switcheroo: add driver control power feature. (v3)

[Hohahiu]

Hello, Dave!

I have a hybrid muxless laptop with intel+radeon:
#lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core 
processor Graphics Controller (rev 09)
01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI 
Cape Verde [Radeon HD 7700M Series]

I have some questions related to this series of patches.
When I power down discrete card by vgaswitcheroo, restart X server and 
turn on radeon card again, xrandr doesn't recognize my discrete card and 
only shows the intel one. Is this a bug or a feature of X server?
And how would this behavior change with this patch?

Also sometimes I have the following configuration:
# cat /sys/kernel/debug/vgaswitcheroo/switch
0:DIS: :Pwr:0000:01:00.0
1:IGD:+:Pwr:0000:00:02.0

In this case if I do
# echo OFF > /sys/kernel/debug/vgaswitcheroo/switch
the system hangs and doesn't respond (ssh, magic keys etc.).

In the meantime for a
# cat /sys/kernel/debug/vgaswitcheroo/switch
0:IGD:+:Pwr:0000:00:02.0
1:DIS: :Pwr:0000:01:00.0

# echo OFF > /sys/kernel/debug/vgaswitcheroo/switch
powers down discrete card successfully.

Would it be resolved with these patches?

Hohahiu

PS. Should I open bug report for these issues?