AMD hybrid graphics still don't switch for the fourth year in a row

Screen resolution, 3D Acceleration, nVidia, ATI
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AMD hybrid graphics still don't switch for the fourth year in a row

Post by a.bowers »

Linux Mint 19.1. Kernel

My hybrid graphics still won't behave themselves. I can't get my Radeon card to turn on. I'll try to give the output of some vaguely useful shell commands.

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lspci -k | grep -EA3 'VGA|Display'
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated Graphics Controller (rev 0b)
	Subsystem: Dell Haswell-ULT Integrated Graphics Controller
	Kernel driver in use: i915
	Kernel modules: i915
08:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Opal XT [Radeon R7 M265]
	Subsystem: Dell Opal XT [Radeon R7 M265]
	Kernel driver in use: radeon
	Kernel modules: radeon, amdgpu

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sudo cat /sys/kernel/debug/vgaswitcheroo/switch
0:DIS: :DynOff:0000:08:00.0

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sudo cat /etc/default/grub
# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
#   info -f grub -n 'Simple configuration'

GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash radeon.modeset=1 radeon.runpm=1"

# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)

# Uncomment to disable graphical terminal (grub-pc only)

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux

# Uncomment to disable generation of recovery mode menu entries

# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"
Even if I weren't already struggling to understand how any of this crap fits together and works, this one completely melts my brain: If I attempt to echo OFF or DIS into VGAswitcheroo, I get "permission denied" even with sudo. Commands prefaced with DRI_Prime=1 either have no effect and are run on the Intel graphics, or it fails after a few seconds with a long-winded error message.

How do I get it working and KEEP it working?

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