Xwayland refresh rate reported by xrandr is incorrect

[Daniel van Vugt]

Xwayland refresh rate reported by 'xrandr' is incorrect:

  1920x1200 59.88*+

Actually my hardware runs at 59.95Hz, as confirmed by 'weston-info'.

If Xwayland is reporting the wrong frequency to apps via Xrandr then apps and toolkits implementing frame clocks (i.e. not synchronously tied to swap buffers) may animate at the wrong frequency, causing some stuttering and skipped frames.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: xwayland 2:1.19.3-1ubuntu6
ProcVersionSignature: Ubuntu 4.12.0-13.14-generic 4.12.10
Uname: Linux 4.12.0-13-generic x86_64
ApportVersion: 2.20.7-0ubuntu1
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
Date: Thu Sep 14 11:40:31 2017
DistUpgraded: Fresh install
DistroCodename: artful
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation Xeon E3-1200 v3 Processor Integrated Graphics Controller [8086:041a] (rev 06) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Xeon E3-1200 v3 Processor Integrated Graphics Controller [17aa:30a1]
InstallationDate: Installed on 2017-05-03 (133 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170502)
MachineType: LENOVO 30AJS05700
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.12.0-13-generic.efi.signed root=UUID=1446940d-616b-4f78-926f-05ddb67580b8 ro quiet splash vt.handoff=7
SourcePackage: xorg-server
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/02/2015
dmi.bios.vendor: LENOVO
dmi.bios.version: FBKTB6AUS
dmi.board.name: SHARKBAY
dmi.board.vendor: LENOVO
dmi.board.version: SDK0E50519 PRO
dmi.chassis.type: 7
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnLENOVO:bvrFBKTB6AUS:bd08/02/2015:svnLENOVO:pn30AJS05700:pvrThinkStationP300:rvnLENOVO:rnSHARKBAY:rvrSDK0E50519PRO:cvnToBeFilledByO.E.M.:ct7:cvrToBeFilledByO.E.M.:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: 30AJS05700
dmi.product.version: ThinkStation P300
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.13.1+17.10.20170720-0ubuntu1
version.libdrm2: libdrm2 2.4.82-1
version.libgl1-mesa-dri: libgl1-mesa-dri 17.2.0-0ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx 17.2.0-0ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.19.3-1ubuntu6
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.9.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20170309-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2
xserver.bootTime: Mon Jul 31 16:27:11 2017
xserver.configfile: default
xserver.errors:
 modeset(G0): eglGetDisplay() failed
 modeset(G0): glamor initialization failed
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:

xserver.version: 2:1.19.3-1ubuntu2

[Daniel van Vugt (vanvugt)]

Xwayland refresh rate reported by 'xrandr' is incorrect:

  1920x1200 59.88*+

Actually my display runs at 59.95Hz, as confirmed by 'weston-info'.

If Xwayland is reporting the wrong frequency to apps via Xrandr then apps and toolkits implementing frame clocks (i.e. not synchronously tied to swap buffers) may animate at the wrong frequency, causing some stuttering and skipped frames.

[Gitlab-migration (gitlab-migration)]

-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been closed from further activity.

You can subscribe and participate further through the new bug through this link to our GitLab instance: https://gitlab.freedesktop.org/xorg/xserver/issues/707.