Since Xorg is using the modeset driver here I think this might be an
issue with the Raspberry Pi kernel driver(s)
** Package changed: xorg (Ubuntu) => xorg-server (Ubuntu)
** Summary changed:
- DPMS does not switch off the monitor back light
+ DPMS does not switch off the monitor back light on Raspberry Pi 4
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1852752
Title:
DPMS does not switch off the monitor back light on Raspberry Pi 4
Status in linux package in Ubuntu:
New
Status in xorg-server package in Ubuntu:
New
Bug description:
'xset dpms force off' blanks the screen but does not switch off the
HDMI (LCD) monitor backlight.
'xset -q' shows DPMS is enabled.
'tvservice -o' does switch off the monitor.
No warnings/errors related to dpms in /var/log/XOrg.0.log
Not sure if this is a xorg, kernel, libxcb-dpms0 or other issue.
ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: xorg 1:7.7+19ubuntu12
ProcVersionSignature: User Name 5.3.0-1012.14-raspi2 5.3.7
Uname: Linux 5.3.0-1012-raspi2 aarch64
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: arm64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CompositorRunning: None
CurrentDesktop: XFCE
Date: Fri Nov 15 18:33:52 2019
DistUpgraded: Fresh install
DistroCodename: eoan
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
ProcKernelCmdLine: coherent_pool=1M 8250.nr_uarts=1 cma=64M cma=256M
video=HDMI-A-1:1920x1080@60 smsc95xx.macaddr=DC:A6:32:17:19:0B
vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000 net.ifnames=0
dwc_otg.lpm_enable=0 console=ttyS0,115200 console=tty1 root=LABEL=writable
rootfstype=ext4 elevator=deadline rootwait quiet splash
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.99-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 19.2.1-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.5+git20191008-0ubuntu1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.0.1-1ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1
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