Created attachment 128628 [details] Xorg intialization log with crash I have an HP 850 Elitebook laptop with Intel GPU and secondary discrete AMD HD 8730M GPU. With the following contents (that worked for a long time) of /etx/X11/xorg.conf.d/20-gpu.conf: ection "Device" Identifier "intel" Driver "intel" Option "DRI" "3" Option "VSync" "False" BusID "PCI:0:2:0" Screen 0 EndSection Section "Device" Identifier "radeon" Driver "radeon" Option "VSync" "False" Option "DRI" "3" BusID "PCI:3:0:0" Screen 1 EndSection my Xorg server crashes during intialization stage with the following backtrace: [ 42.673] (EE) Backtrace: [ 42.673] (EE) 0: /usr/libexec/Xorg (OsLookupColor+0x139) [0x59e7d9] [ 42.674] (EE) 1: /lib64/libpthread.so.0 (__restore_rt+0x0) [0x7ff7a1c705bf] [ 42.674] (EE) 2: /usr/libexec/Xorg (xf86SetDepthBpp+0x5d0) [0x4839c0] [ 42.674] (EE) 3: /usr/lib64/xorg/modules/drivers/radeon_drv.so (_init+0x3e6e6) [0x7ff79cd26c16] [ 42.674] (EE) 4: /usr/libexec/Xorg (InitOutput+0xb5d) [0x47d78d] [ 42.674] (EE) 5: /usr/libexec/Xorg (InitFonts+0x216) [0x43ae06] [ 42.674] (EE) 6: /lib64/libc.so.6 (__libc_start_main+0xf1) [0x7ff7a18b9401] [ 42.674] (EE) 7: /usr/libexec/Xorg (_start+0x2a) [0x424cfa] [ 42.675] (EE) 8: ? (?+0x2a) [0x2a] [ 42.675] (EE) [ 42.675] (EE) Segmentation fault at address 0x0 [ 42.675] (EE) Fatal server error: [ 42.675] (EE) Caught signal 11 (Segmentation fault). Server aborting [ 42.675] (EE) It seems that radeon_drv dislikes config with depth=24 bpp and fb=32 bpp. If I add the following section to my 20-gpu.conf: Section "Screen" Identifier "def_screen" Device "intel" GPUDevice "radeon" DefaultDepth 24 DefaultFbBpp 24 EndSection forcing fpbbb=24, then crash disappears (Xorg seems to initialize fine) but the screen is completely blank. If at the same time I change driver to "modesetting" then Xorg crashes again. This behaviour seems to be introduced with kernel 4.8 and still remains in 4.9.
(In reply to Alexander Gagarin from comment #0) > With the following contents (that worked for a long time) of > /etx/X11/xorg.conf.d/20-gpu.conf: BTW, please use /etc/X11/xorg.conf itself for your configuration, not any xorg.conf.d snippets. > ection "Device" > Identifier "intel" > Driver "intel" > Option "DRI" "3" > Option "VSync" "False" > BusID "PCI:0:2:0" > Screen 0 > EndSection > > Section "Device" > Identifier "radeon" > Driver "radeon" > Option "VSync" "False" > Option "DRI" "3" > BusID "PCI:3:0:0" > Screen 1 > EndSection FWIW, this configuration is incorrect for your hardware setup. The Screen stanzas are for associating multiple Device sections to the same GPU. > It seems that radeon_drv dislikes config with depth=24 bpp and fb=32 bpp. That's what basically everybody else is using... > This behaviour seems to be introduced with kernel 4.8 and still remains in > 4.9. Weird. Can you bisect the kernel, or get a gdb backtrace of the Xorg crash (make sure debugging symbols are available for /usr/libexec/Xorg and
It seems that everything is working after I remove "Screen" options from my config. But I have had to add 'em because otherwise I couldn't setup working configuration with GPU switching via DRI_PRIME on earlier kernels. Anyway, issue is resolved, but something wrong still remains inside all that machinery.
Glad it's working again. Resolving as invalid configuration. (In reply to Alexander Gagarin from comment #2) > But I have had to add 'em because otherwise I couldn't setup working > configuration with GPU switching via DRI_PRIME on earlier kernels. Weird, not sure how the screen stanzas could have any effect on that. Anyway, FWIW, if you enable DRI3 with the intel driver, DRI_PRIME will work even if the radeon driver isn't configured at all in Xorg.
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