Note to any users affected by this bug: a workaround is to manually
populate the /com/ubuntu/user-interface/scale-factor key. For example,
on my MacBook Pro, I set it using dconf-editor to:
{'eDP1': 16, 'DP1': 8, 'DP2': 8, 'HDMI1': 8, 'HDMI2': 8}
It is a fairly safe assumption that the internal display (eDP1) will
always be the same DPI, and that I will only use non-Retina external
displays. Most users should be in the same situation, unless they're
lucky enough to use secondary Retina displays sometimes, but not lucky
enough to use them always.
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https://bugs.launchpad.net/bugs/1606959
Title:
DPI setting is not correctly calculated on Ubuntu GNOME
Status in chromium-browser package in Ubuntu:
New
Bug description:
On Ubuntu GNOME 16.04 on my Retina MacBook Pro, chromium-browser,
unlike any other app I've found, gets the wrong DPI, and starts up
unscaled.
On investigation, this appears to be because of a bug in
desktop_screen_x11.cc (I checked this only in the sources for the
currently shipped version of Chromium, against which I'm reporting
this bug).
The hardware is *correctly* queried via the GTK2 back-end in
gtk2_ui.cc, and device_scale_factor is set to 2 in line 328 of
desktop_screen_x11.cc.
However, this is then unconditionally overridden lower down. In line
356, density_indicator is set to 8 (this corresponds to a scale factor
of 1). The next few lines, guarded by #ifdef USE_GLIB, then try to
read a value from the gsettings key /com/ubuntu/user-interface/scale-
factor.
Aside: Under Unity, I understand that this setting is populated with
information about the connected displays (I did try to find where this
happens, but I can only find references to the setting in unity-
control-center, while presumably it must also be set whenever a new
display is plugged or unplugged); under GNOME it seems not to be.
The problem is that when the gsettings key /com/ubuntu/user-interface
/scale-factor is empty, or absent, the default value of
density_indicator is still used, overriding the hardware-provided
value. The only circumstances in which the hardware-provided value
will be used are when the key for the relevant display is explicitly
set to 0.
This means that scaling won't work on a GNOME system, which is ironic
considering that the correct information has already been obtained
from Gtk!
As far as I can see, the fix is to change the setting of 8 in line 356
to 0, so that if no gsettings value can be obtained, then the
hardware-supplied value, which has already been calculated, is used.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: chromium-browser 51.0.2704.79-0ubuntu0.16.04.1.1242
ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
Uname: Linux 4.4.0-31-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: GNOME
DRM.card0-DP-1:
edid-base64:
dpms: Off
modes:
enabled: disabled
status: disconnected
DRM.card0-DP-2:
edid-base64:
dpms: Off
modes:
enabled: disabled
status: disconnected
DRM.card0-HDMI-A-1:
edid-base64:
dpms: Off
modes:
enabled: disabled
status: disconnected
DRM.card0-HDMI-A-2:
edid-base64:
dpms: Off
modes:
enabled: disabled
status: disconnected
DRM.card0-eDP-1:
edid-base64:
AP///////wAGEBigAAAAADAWAQSlHRJ4Am+xp1VMniUMUFQAAAABAQEBAQEBAQEBAQEBAQEB4mgAoKBALmAwIDYAHrMQAAAaAAAA/ABDb2xvciBMQ0QKICAgAAAAEAAAAAAAAAAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAAAAAGM=
dpms: On
modes: 2560x1600
enabled: enabled
status: connected
Date: Wed Jul 27 15:14:57 2016
Desktop-Session:
'gnome'
'/etc/xdg/xdg-gnome:/usr/share/upstart/xdg:/etc/xdg'
'/usr/share/gnome:/usr/local/share/:/usr/share/:/var/lib/snapd/desktop'
Env:
'None'
'/home/rrt/.local/lib/x86_64-linux-gnu'
InstallationDate: Installed on 2015-12-28 (212 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
Load-Avg-1min: 0.49
Load-Processes-Running-Percent: 0.1%
MachineType: Apple Inc. MacBookPro11,1
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-31-generic.efi.signed
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
SourcePackage: chromium-browser
UpgradeStatus: Upgraded to xenial on 2016-07-25 (2 days ago)
dmi.bios.date: 09/08/2015
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MBP111.88Z.0138.B16.1509081438
dmi.board.asset.tag: Base Board Asset Tag#
dmi.board.name: Mac-189A3D4F975D5FFC
dmi.board.vendor: Apple Inc.
dmi.board.version: MacBookPro11,1
dmi.chassis.type: 10
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-189A3D4F975D5FFC
dmi.modalias:
dmi:bvnAppleInc.:bvrMBP111.88Z.0138.B16.1509081438:bd09/08/2015:svnAppleInc.:pnMacBookPro11,1:pvr1.0:rvnAppleInc.:rnMac-189A3D4F975D5FFC:rvrMacBookPro11,1:cvnAppleInc.:ct10:cvrMac-189A3D4F975D5FFC:
dmi.product.name: MacBookPro11,1
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.
etcconfigcpepperflashpluginnonfree:
flashso="/usr/lib/pepperflashplugin-nonfree/libpepflashplayer.so"
flashversion=`strings $flashso 2> /dev/null | grep LNX | cut -d ' ' -f 2 |
sed -e "s/,/./g"`
CHROMIUM_FLAGS="$CHROMIUM_FLAGS --ppapi-flash-path=$flashso
--ppapi-flash-version=$flashversion"
gconf-keys: /desktop/gnome/applications/browser/exec =
b'/usr/bin/chromium-browser\n'/desktop/gnome/url-handlers/https/command =
b'/usr/bin/chromium-browser --new-window
%U\n'/desktop/gnome/url-handlers/https/enabled =
b'false\n'/desktop/gnome/url-handlers/http/command = b'sensible-browser
%s\n'/desktop/gnome/url-handlers/http/enabled =
b'false\n'/desktop/gnome/session/required_components/windowmanager =
b'compiz\n'/apps/metacity/general/compositing_manager =
b''/desktop/gnome/interface/icon_theme =
b'Tangerine\n'/desktop/gnome/interface/gtk_theme = b'Human-Clearlooks\n'
modified.conffile..etc.chromium-browser.default: [modified]
modified.conffile..etc.default.chromium-browser: [deleted]
mtime.conffile..etc.chromium-browser.default: 2016-03-28T15:20:54.598177
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