[Bug 111272] [DRI_PRIME] Error on multi GPU with only one enabled

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=111272

            Bug ID: 111272
           Summary: [DRI_PRIME] Error on multi GPU with only one enabled
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: parker.l.reed@gmail.com

Created attachment 144921
  --> https://bugs.freedesktop.org/attachment.cgi?id=144921&action=edit
DRI PRIME 0

I have a Razer Blade Stealth late 2016 with a Razer Core V1 and an RX 560.

Arch Linux

Linux stealth 5.2.1-arch1-1-fsync #1 SMP PREEMPT Mon Jul 22 17:40:06 PDT 2019
x86_64 GNU/Linux

mesa-aco-git 19.2.0_devel.114720.5c6077221dd-1 (Also happens on normal mesa-git
and mesa stable)

With only the AMDGPU enabled for Xorg, DRI_PRIME=1 attempts to use Intel, falls
back to AMD as expected, but has the weird behavior of completely bypassing
vsync. DRI_PRIME=0 works as expected

Expected behavior is to ignore the Intel card since it's not currently loaded
in Xorg. I can obviously set DRI_PRIME=0 and be fine, but the DRI_PRIME=1
behavior seems to be a bug.

Xorg conf

Section "Device"
 Identifier "AMD"
 Driver "amdgpu"
 BusID "PCI:07:0:0"
EndSection

xrandr corroborates this in the listproviders output

Providers: number : 1
Provider 0: id: 0x57 cap: 0xf, Source Output, Sink Output, Source Offload, Sink
Offload crtcs: 5 outputs: 3 associated providers: 0 name:AMD Radeon (TM) RX 460
Graphics @ pci:0000:07:00.0

DRI_PRIME=1 glxinfo reports the same info aside from an error at the top of the
output

libGL error: Different GPU, but blitImage not implemented for this driver
libGL error: failed to load driver: i965

Full glxinfo attached for DRI_PRIME=0, DRI_PRIME=1, and DRI_PRIME=1 with
vblank_mode=1

glxgears for FPS example

$ DRI_PRIME=0 glxgears
Running synchronized to the vertical refresh.  The framerate should be
approximately the same as the monitor refresh rate.
333 frames in 5.0 seconds = 66.549 FPS
300 frames in 5.0 seconds = 59.999 FPS
300 frames in 5.0 seconds = 59.997 FPS
301 frames in 5.0 seconds = 60.001 FPS

$ DRI_PRIME=1 glxgears
libGL error: Different GPU, but blitImage not implemented for this driver
libGL error: failed to load driver: i965
Running synchronized to the vertical refresh.  The framerate should be
approximately the same as the monitor refresh rate.
42158 frames in 5.0 seconds = 8431.391 FPS
42406 frames in 5.0 seconds = 8481.144 FPS
42266 frames in 5.0 seconds = 8453.060 FPS
42444 frames in 5.0 seconds = 8488.649 FPS

$ vblank_mode=1 DRI_PRIME=1 glxgears
libGL error: Different GPU, but blitImage not implemented for this driver
libGL error: failed to load driver: i965
ATTENTION: default value of option vblank_mode overridden by environment.
42081 frames in 5.0 seconds = 8415.999 FPS
42527 frames in 5.0 seconds = 8505.298 FPS
42591 frames in 5.0 seconds = 8518.191 FPS
42508 frames in 5.0 seconds = 8501.433 FPS

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