Hello Hans,
Hans de Goede wrote: > Hi, > > On 20-10-17 19:08, [email protected] wrote: >> On laptop systems with a dedicated (powerful) GPU A, you usually >> have all connectors routed to another (less-powerful) GPU B. >> >> With my setup (GPU A = Nvidia, GPU B = Intel) I keep GPU A switched >> off by not loading the nouveau kernel driver during boot. >> >> Loading nouveau while X is running then crashes the server: >> [ 540.775] (EE) 0: /usr/bin/X (xorg_backtrace+0x41) [0x57fa31] >> [ 540.775] (EE) 1: /usr/bin/X (0x400000+0x183429) [0x583429] >> [ 540.775] (EE) 2: /lib64/libpthread.so.0 (0x7ff02d508000+0x10ec0) >> [0x7ff02d518ec0] >> [ 540.775] (EE) 3: /lib64/libc.so.6 (gsignal+0x38) [0x7ff02d1a2178] >> [ 540.775] (EE) 4: /lib64/libc.so.6 (abort+0x16a) [0x7ff02d1a35fa] >> [ 540.775] (EE) 5: /lib64/libc.so.6 (0x7ff02d16f000+0x2c0b7) >> [0x7ff02d19b0b7] >> [ 540.775] (EE) 6: /lib64/libc.so.6 (0x7ff02d16f000+0x2c162) >> [0x7ff02d19b162] >> [ 540.775] (EE) 7: /usr/bin/X (dixRegisterPrivateKey+0x247) [0x452197] >> [ 540.775] (EE) 8: /usr/lib64/xorg/modules/libglamoregl.so >> (glamor_init+0x160) [0x7ff00ee564d0] >> [ 540.775] (EE) 9: /usr/lib64/xorg/modules/drivers/modesetting_drv.so >> (0x7ff01c19a000+0x83e1) [0x7ff01c1a23e1] >> [ 540.775] (EE) 10: /usr/bin/X (AddGPUScreen+0xf3) [0x4348b3] >> [ 540.775] (EE) 11: /usr/bin/X (0x400000+0x90271) [0x490271] >> [ 540.775] (EE) 12: /usr/bin/X (0x400000+0x9547b) [0x49547b] >> [ 540.775] (EE) 13: /usr/bin/X (0x400000+0x905d7) [0x4905d7] >> [ 540.775] (EE) 14: /usr/bin/X (xf86VTEnter+0x1bb) [0x47399b] >> [ 540.775] (EE) 15: /usr/bin/X (WakeupHandler+0xda) [0x438e3a] >> [ 540.775] (EE) 16: /usr/bin/X (WaitForSomething+0x1ce) [0x57d6fe] >> [ 540.775] (EE) 17: /usr/bin/X (0x400000+0x34221) [0x434221] >> [ 540.775] (EE) 18: /usr/bin/X (0x400000+0x382f8) [0x4382f8] >> [ 540.775] (EE) 19: /lib64/libc.so.6 (__libc_start_main+0xf0) >> [0x7ff02d18f670] >> [ 540.776] (EE) 20: /usr/bin/X (_start+0x29) [0x4235b9] >> >> In particular note that GLAMOR is initialized for GPU A, which >> makes no sense since it has no connectors. >> >> Fix this by bailing out early in the modesetting DDX when a setup >> with zero connectors is detected. >> >> Signed-off-by: Tobias Jakobi <[email protected]> > > Sorry, but NACK. The modesetting driver actually had such a check before > and I removed it because not having a driver breaks rendering on > the dedicated GPU with "DRI_PRIME=1" for dri2 clients. sorry, I didn't consider DRI2 in this scenario. > I guess that there is some sort of assumption in the code for dealing > with glamor failure that it only happens on coldplug, if you really > want to be able to modprobe nouveau later you should figure out what > is exactly going wrong and fix that. OK, I'll try to get to the bottom of this. > Note BTW that nouveau should runtime suspend the GPU, even with Xorg > running and there really is no need to not load nouveau. No, sadly this is not true on my system. The system has a dual cooling solution, where cooler A is attached to the CPU, and cooler B to the GPU. When never inserting nouveau.ko after boot, cooler B stays off the entire time. Once I've inserted the module, cooler B comes up from time to time _even_ if the GPU is runtime suspended at that time (and has been since hours). - Tobias > > Regards, > > Hans _______________________________________________ [email protected]: X.Org development Archives: http://lists.x.org/archives/xorg-devel Info: https://lists.x.org/mailman/listinfo/xorg-devel
