Arch Linux

Description:

I have an hybrid ATI/Intel GPU and whenever I open Emacs, X crashes.

My notebook is a Dell Inspiron 15R-5537-A10 - it has a Radeon HD 8670M GPU and Intel i7-4500U with Intel HD Graphics 4400 integrated GPU.

The hybrid GPU otherwise works, with PRIME (by setting it with xrandr and running glxinfo with or without DRI_PRIME=1). The above crash happens either if I don't configure PRIME, or if I configure it and either set or don't set DRI_PRIME. I can run any program, except Emacs. It also crashes when I run vanilla Emacs with no configurations.

A workaround is to add modprobe.blacklist=radeon to the kernel boot line, making Emacs run fine.


Additional info:

$ lspci | egrep 'VGA|Display'
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated Graphics Controller (rev 09)
03:00.0 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] Sun XT [Radeon HD 8670A/8670M/8690M] (rev ff)

$ pacman -Qv xorg-server xf86-video-intel xf86-video-ati mesa-dri libdrm linux emacs glibc | grep -v :
xorg-server 1.16.2-1
xf86-video-intel 2.99.916-3
mesa-dri 10.3.5-1
libdrm 2.4.58-1
linux 3.17.4-1
emacs 24.4-1
glibc 2.20-4

Also this from Xorg.log (the full log is attached)

[ 78.539] (EE) Backtrace:
[ 78.539] (EE) 0: /usr/bin/Xorg.bin (xorg_backtrace+0x56) [0x593d36]
[ 78.539] (EE) 1: /usr/bin/Xorg.bin (0x400000+0x197e89) [0x597e89]
[ 78.539] (EE) 2: /usr/lib/libc.so.6 (0x7f8c6f003000+0x33b20) [0x7f8c6f036b20]
[ 78.539] (EE)
[ 78.539] (EE) Segmentation fault at address 0x0
[ 78.539] (EE)
[ 78.539] (EE) Caught signal 11 (Segmentation fault). Server aborting


Steps to reproduce:

1. Start X (in my case, LightDM launches XFCE on boot, but it happens in other DEs too)

2. Launch Emacs