Created attachment 130147 [details] Serial line output with drm.debug=0xe and nouveau.debug=trace I try to follow the documentation at https://nouveau.freedesktop.org/wiki/Optimus/ to enable my nvidia card, I only get black screen with the GPU offloading. Laptop: DELL M6800 OS: Debian Jessie (8.7) with Mesa 10.3.2 and Xorg server 1.16.4 Kernel: 4.9.13 CPU + iGPU: Intel i7-4810MQ dGPU: Quadro K4100M Hardware: 00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller (rev 06) 01:00.0 VGA compatible controller: NVIDIA Corporation GK104GLM [Quadro K4100M] (rev a1) Step 1: $ xrandr Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192 eDP1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 382mm x 215mm 1920x1080 60.01*+ 59.93 48.01 1680x1050 59.95 59.88 1600x1024 60.17 1400x1050 59.98 1280x1024 60.02 1440x900 59.89 1280x960 60.00 1360x768 59.80 59.96 1152x864 60.00 1024x768 60.00 800x600 60.32 56.25 640x480 59.94 VGA1 disconnected (normal left inverted right x axis y axis) DP4 disconnected (normal left inverted right x axis y axis) HDMI1 disconnected (normal left inverted right x axis y axis) Step 2: $ xrandr --listproviders Providers: number : 2 Provider 0: id: 0x8d cap: 0xb, Source Output, Sink Output, Sink Offload crtcs: 3 outputs: 4 associated providers: 0 name:Intel Provider 1: id: 0x66 cap: 0x7, Source Output, Sink Output, Source Offload crtcs: 4 outputs: 3 associated providers: 0 name:nouveau Step 3: $ DRI_PRIME=0 glxinfo | grep "OpenGL vendor" OpenGL vendor string: Intel Open Source Technology Center $ DRI_PRIME=1 glxinfo | grep "OpenGL vendor" OpenGL vendor string: Intel Open Source Technology Center Step 4: $ xrandr --setprovideroffloadsink nouveau Intel $ DRI_PRIME=1 glxinfo | grep "OpenGL vendor" OpenGL vendor string: nouveau Step 5: $ DRI_PRIME=1 glxgears -info Running synchronized to the vertical refresh. The framerate should be approximately the same as the monitor refresh rate. GL_RENDERER = Gallium 0.4 on NVE4 GL_VERSION = 3.0 Mesa 10.3.2 GL_VENDOR = nouveau GL_EXTENSIONS = <lots of extensions> VisualID 104, 0x68 102606 frames in 5.0 seconds = 20521.141 FPS 103124 frames in 5.0 seconds = 20624.639 FPS The glxgears window is black and stay black even after a resize. I see those messages on dmesg: [ 12.404679] nouveau 0000:01:00.0: No connectors reported connected with modes [ 12.404700] [drm] Cannot find any crtc or sizes - going 1024x768 So I run the following step 6: $ xrandr --setprovideroutputsource nouveau Intel But the problem is still the same. I also try vgaswitcheroo and the switch on discrete card gives me a black screen too. Fortunately I can switch back to the IGD with my serial line. The option 'nouveau.runpm=0' do not change the issue, so I guest it's not PM related. How can I help to debug this issue ?
In order for GPU offloading to work with DRI2, you must be running a redirecting compositor. Are you running such a compositor?
(In reply to Ilia Mirkin from comment #1) > In order for GPU offloading to work with DRI2, you must be running a > redirecting compositor. Are you running such a compositor? I use xfwm 4.12.3. Is it a redirecting compositor ? Do you think the vgaswitcheroo is a different problem ? Should I fill a new bug for vgaswitcheroo ?
No clue. I don't use xfwm and don't want to lie about what it does. Most wm's (window managers) are not compositors at all. vgaswitcheroo likely will have no effect on your system as it most likely does not have a mux for the panel, and clearly both GPUs can be powered on at the same time.
(In reply to Ilia Mirkin from comment #3) > No clue. I don't use xfwm and don't want to lie about what it does. Most > wm's (window managers) are not compositors at all. It works with mutter/grome3, so it was a xfwm problem. > vgaswitcheroo likely will have no effect on your system as it most likely > does not have a mux for the panel, and clearly both GPUs can be powered on > at the same time. Thank you for your help Ilia. I close the bug.
(In reply to Anthoine Bourgeois from comment #4) > (In reply to Ilia Mirkin from comment #3) > > No clue. I don't use xfwm and don't want to lie about what it does. Most > > wm's (window managers) are not compositors at all. > > It works with mutter/grome3, so it was a xfwm problem. The composition probably just needs to come from a different application. Like xcompmgr or something. Or perhaps xfwm has an option to enable composition. If you update your stack and switch to DRI3, you won't need to use a compositor. I'd recommend Xorg 1.18 + Mesa 17.0. With the latter you'll get a lot more out of both your iGPU and dGPUs. If you update to kernel 4.10 you should be able to manually reclock your dGPU in order to make full use of its performance.
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