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 <tjak...@math.uni-bielefeld.de> --- hw/xfree86/drivers/modesetting/driver.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/hw/xfree86/drivers/modesetting/driver.c b/hw/xfree86/drivers/modesetting/driver.c index 9afb344c8..8a5f63685 100644 --- a/hw/xfree86/drivers/modesetting/driver.c +++ b/hw/xfree86/drivers/modesetting/driver.c @@ -920,6 +920,12 @@ PreInit(ScrnInfoPtr pScrn, int flags) if (!check_outputs(ms->fd, &connector_count)) return FALSE; + if (!connector_count) { + xf86DrvMsg(pScrn->scrnIndex, X_INFO, + "Device is headless (no connectors available)\n"); + return FALSE; + } + drmmode_get_default_bpp(pScrn, &ms->drmmode, &defaultdepth, &defaultbpp); if (defaultdepth == 24 && defaultbpp == 24) { ms->drmmode.force_24_32 = TRUE; -- 2.13.6 _______________________________________________ xorg-devel@lists.x.org: X.Org development Archives: http://lists.x.org/archives/xorg-devel Info: https://lists.x.org/mailman/listinfo/xorg-devel