Public bug reported:
When using the combination of modesetting Xorg driver with Intel GVT-g
enabled, it was observed problems with brightness control.
While the brightness control still has functionality, it works with
significant delay for every change. Every change takes roughly half a
second, making the change from zero to full brightness using the
keyboard shortcuts take more than 10 seconds. The brightness keys are
buffered too, making it hard to reach intermediate values.
The attached video show the problem being reproduced using xfce4-power-
manager notification on the xfce4-panel.
This problem wasn't observed when using the Intel Xorg driver and this
problem doesn't happen if modesetting is used without iGVT-g.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xserver-xorg-core 2:1.20.7-2ubuntu2
ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
Uname: Linux 5.4.0-21-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu21
Architecture: amd64
BootLog:
CompositorRunning: None
Date: Wed Apr 1 21:02:21 2020
DistUpgraded: 2019-12-22 18:50:28,852 DEBUG Running PostInstallScript:
'./xorg_fix_proprietary.py'
DistroCodename: focal
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
Intel Corporation Skylake GT2 [HD Graphics 520] [8086:1916] (rev 07) (prog-if
00 [VGA controller])
Subsystem: Lenovo Skylake GT2 [HD Graphics 520] [17aa:3822]
InstallationDate: Installed on 2017-06-13 (1023 days ago)
InstallationMedia: Xubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
MachineType: LENOVO 80UG
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-21-generic
root=UUID=6b4ae5c0-c78c-49a6-a1ba-029192618a7a ro quiet ro kvm.ignore_msrs=1
kvm.report_ignored_msrs=0 kvm.halt_poll_ns=0 kvm.halt_poll_ns_grow=0
i915.enable_gvt=1 resume=UUID=a82e38a0-8d20-49dd-9cbd-de7216b589fc
log_buf_len=16M usbhid.quirks=0x0079:0x0006:0x100000 mtrr_gran_size=64M
mtrr_chunk_size=64M nbd.nbds_max=2 nbd.max_part=63
SourcePackage: xorg-server
UpgradeStatus: Upgraded to focal on 2019-12-22 (101 days ago)
dmi.bios.date: 08/09/2018
dmi.bios.vendor: LENOVO
dmi.bios.version: 0XCN45WW
dmi.board.asset.tag: NO Asset Tag
dmi.board.name: Toronto 4A2
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40679 WIN
dmi.chassis.asset.tag: NO Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo ideapad 310-14ISK
dmi.modalias:
dmi:bvnLENOVO:bvr0XCN45WW:bd08/09/2018:svnLENOVO:pn80UG:pvrLenovoideapad310-14ISK:rvnLENOVO:rnToronto4A2:rvrSDK0J40679WIN:cvnLENOVO:ct10:cvrLenovoideapad310-14ISK:
dmi.product.family: IDEAPAD
dmi.product.name: 80UG
dmi.product.sku: LENOVO_MT_80UG_BU_idea_FM_Lenovo ideapad 310-14ISK
dmi.product.version: Lenovo ideapad 310-14ISK
dmi.sys.vendor: LENOVO
mtime.conffile..etc.apport.crashdb.conf: 2019-08-29T08:39:36.787240
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.100-4
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.2-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx 20.0.2-1ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.20.7-2ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.6-1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel
2:2.99.917+git20190815-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1
** Affects: xorg-server (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal ubuntu
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https://bugs.launchpad.net/bugs/1870250
Title:
Brightness control works in a inconsistent manner using modesetting
Status in xorg-server package in Ubuntu:
New
Bug description:
When using the combination of modesetting Xorg driver with Intel GVT-g
enabled, it was observed problems with brightness control.
While the brightness control still has functionality, it works with
significant delay for every change. Every change takes roughly half a
second, making the change from zero to full brightness using the
keyboard shortcuts take more than 10 seconds. The brightness keys are
buffered too, making it hard to reach intermediate values.
The attached video show the problem being reproduced using xfce4
-power-manager notification on the xfce4-panel.
This problem wasn't observed when using the Intel Xorg driver and this
problem doesn't happen if modesetting is used without iGVT-g.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xserver-xorg-core 2:1.20.7-2ubuntu2
ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
Uname: Linux 5.4.0-21-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu21
Architecture: amd64
BootLog:
CompositorRunning: None
Date: Wed Apr 1 21:02:21 2020
DistUpgraded: 2019-12-22 18:50:28,852 DEBUG Running PostInstallScript:
'./xorg_fix_proprietary.py'
DistroCodename: focal
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
Intel Corporation Skylake GT2 [HD Graphics 520] [8086:1916] (rev 07)
(prog-if 00 [VGA controller])
Subsystem: Lenovo Skylake GT2 [HD Graphics 520] [17aa:3822]
InstallationDate: Installed on 2017-06-13 (1023 days ago)
InstallationMedia: Xubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
MachineType: LENOVO 80UG
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-21-generic
root=UUID=6b4ae5c0-c78c-49a6-a1ba-029192618a7a ro quiet ro kvm.ignore_msrs=1
kvm.report_ignored_msrs=0 kvm.halt_poll_ns=0 kvm.halt_poll_ns_grow=0
i915.enable_gvt=1 resume=UUID=a82e38a0-8d20-49dd-9cbd-de7216b589fc
log_buf_len=16M usbhid.quirks=0x0079:0x0006:0x100000 mtrr_gran_size=64M
mtrr_chunk_size=64M nbd.nbds_max=2 nbd.max_part=63
SourcePackage: xorg-server
UpgradeStatus: Upgraded to focal on 2019-12-22 (101 days ago)
dmi.bios.date: 08/09/2018
dmi.bios.vendor: LENOVO
dmi.bios.version: 0XCN45WW
dmi.board.asset.tag: NO Asset Tag
dmi.board.name: Toronto 4A2
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40679 WIN
dmi.chassis.asset.tag: NO Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo ideapad 310-14ISK
dmi.modalias:
dmi:bvnLENOVO:bvr0XCN45WW:bd08/09/2018:svnLENOVO:pn80UG:pvrLenovoideapad310-14ISK:rvnLENOVO:rnToronto4A2:rvrSDK0J40679WIN:cvnLENOVO:ct10:cvrLenovoideapad310-14ISK:
dmi.product.family: IDEAPAD
dmi.product.name: 80UG
dmi.product.sku: LENOVO_MT_80UG_BU_idea_FM_Lenovo ideapad 310-14ISK
dmi.product.version: Lenovo ideapad 310-14ISK
dmi.sys.vendor: LENOVO
mtime.conffile..etc.apport.crashdb.conf: 2019-08-29T08:39:36.787240
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.100-4
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.2-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx 20.0.2-1ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.20.7-2ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.6-1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel
2:2.99.917+git20190815-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1
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