i915 enable_rc6=0 not respected

[Robert Dinse]

     i915 enable_rc6=0 is not respected. I want to disable rc6 power savings because it is a tower
machine with a kilowatt supply and lots of fan so I don't give a rip about power consumption, I do not
want my display interrupted while I'm watching a movie or video and when monitoring things I want to
be able to walk by the monitor and see what is going on without having to go up and wiggle the mouse
and wait for it to wake up and my monitor to sync.

     I have an i7-9700k on an Asus Z390A Prime motherboard. I have enable RC6 disabled in the BIOS so BIOS isn't enabling it, in /etc/modprobe.d/i915.conf I have:

     options i915 enable_guc=3 enable_dc=0 enable_rc6=0

     In /etc/default/grub I have:

     GRUB_CMDLINE_LINUX_DEFAULT="quiet splash xdg.force_integrated=1 modprobe.blacklist=nouveau i915.i915_enable_rc6=0"

     I have done update-grub2 and update-initramfs -u -k all and rebooted, but still:

cat /sys/class/drm/card0/power/rc6_enable
1

     The kernel totally ignores my instructions and enables the damned thing anyway. ARRGGH!

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: linux-lowlatency 5.0.0.28.29
ProcVersionSignature: Ubuntu 5.0.0-28.30-lowlatency 5.0.21
Uname: Linux 5.0.0-28-lowlatency x86_64
ApportVersion: 2.20.10-0ubuntu27.1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: nanook 4342 F.... pulseaudio
CurrentDesktop: MATE
Date: Tue Sep 10 16:14:06 2019
MachineType: System manufacturer System Product Name
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.0.0-28-lowlatency root=UUID=718970be-1c9c-4b4e-8940-1e26324e158b ro console=tty1 console=ttyS0 panic=-1
RelatedPackageVersions:
 linux-restricted-modules-5.0.0-28-lowlatency N/A
 linux-backports-modules-5.0.0-28-lowlatency N/A
 linux-firmware 1.178.4
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/06/2019
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1105
dmi.board.asset.tag: Default string
dmi.board.name: PRIME Z390-A
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1105:bd06/06/2019:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnPRIMEZ390-A:rvrRev1.xx:cvnDefaultstring:ct3:cvrDefaultstring:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: System Product Name
dmi.product.sku: ASUS_MB_CNL
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.

[Alex Hung (alexhung)]

i915.enable_rc6 has been removed since kernel 4.16

See https://patchwork.freedesktop.org/patch/191386/ or commit fb6db0f5bf1d4d3a4a for more details