Update after playing with this a bit: While the sensors are detected by the mainline rc4 (and rc5) kernel as stated above, the rotation does not work correctly. I am not sure if this is still a kernel issue or happens elsewhere. Would be great if you could point me in the right direction.
According to the output of the monitor-sensor command of iio-proxy- sensor, it detects the correct orientation in all attempts. However, in some scenarios something rotates the screen back to normal automatically and immediately. When this happens, monitor-sensor does NOT output a switch to "normal". So I suppose the sensor outputs remain correctly detected and the switching back happens elsewhere. On the other hand, this may be connected to a hardware quirk in how the rotation is implemented on the Dell XPS, which similarly also occurs in Windows (https://www.dell.com/community/XPS/Dell-XPS-13-9365-Rotation-lock-unavailable-grayed-out-EXPLAINED/td-p/6075400): * Laptop mode, i.e. keyboard-to-screen angle BELOW 90 degrees: In Windows, this automatically engages the rotation lock, i.e. the screen does not rotate at all. * Tent/tablet mode, i.e. keyboard-to-screen angle ABOVE 90 degrees: In Windows, this releases the rotation lock automatically. The behavior I see in Ubuntu also depends on the keyboard-screen angle. However, the rotation lock in the Gnome panel does NOT automatically engage if the angle is below 90 degrees. This is what happens: * Angle BELOW 90: - Orientation "left-up": screen rotates to portrait correctly, but immediately switches back to normal. - Orientation "right-up": screen rotates to portrait correctly and in most attempts stays like this, but occasionally it immediately switches back to normal. - Orientation "bottom-up": screen rotates rotates upside-down correctly, but immediately switches back to normal. - Orientation "normal": screen always rotates back correctly (if it didn't automatically switch back anyway). * Angle ABOVE 90: - Orientation "left-up": screen rotates to portrait correctly and in most attempts stays like this, but occasionally it immediately switches back to normal. - Orientation "right-up": screen rotates to portrait correctly and apparently randomly either stays like this or immediately switches back to normal. - Orientation "bottom-up": screen rotates rotates upside down correctly most of the time (but occasionally doesn't). - Orientation "normal": screen always rotates back correctly (if it didn't automatically switch back anyway). As you can see, the "left-up" and "right-up" behaviors seem somewhat (but not entirely) swapped depending on the keyboard-screen angle. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1792813 Title: iio-sensor-proxy says: "Could not find any supported sensors" on Dell XPS 15 9575 2-in-1 on Cosmic 18.10 Status in linux package in Ubuntu: Triaged Status in linux source package in Cosmic: Triaged Bug description: On Cosmic, iio-sensor-proxy 2.4, with default 4.18 kernel as well as latest mainline 4.19.0-041900rc3-generic. There is no rotation lock button in the gnome-shell panel menu. Gnome Settings > Device Display shows rotation buttons There is no directory /sys/bus/iio Reproduction: 1. Rotate device, fold display back to tent and tablet modes: -> Rotation is not detected. When folding to tablet mode, device goes to suspend as if display had been closed normally. iio-sensor-proxy finds no sensors: ~$ systemctl status iio-sensor-proxy.service ● iio-sensor-proxy.service - IIO Sensor Proxy service Loaded: loaded (/lib/systemd/system/iio-sensor-proxy.service; static; vendor preset: enabled) Active: inactive (dead) I reported issue as https://github.com/hadess/iio-sensor- proxy/issues/236 and was advised: "Looks like there's no supported sensors, or just no sensors inside this machine. Nothing that we can do about it, except asking your vendor for support (eg. is there one or multiple sensors, and if so, why aren't they supported in the kernel)" I posted the issue in Dell's Project Sputnik's Google+ community ProblemType: Bug DistroRelease: Ubuntu 18.10 Package: linux-image-4.18.0-7-generic 4.18.0-7.8 ProcVersionSignature: Ubuntu 4.18.0-7.8-generic 4.18.5 Uname: Linux 4.18.0-7-generic x86_64 ApportVersion: 2.20.10-0ubuntu9 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: mario 2139 F.... pulseaudio CurrentDesktop: ubuntu:GNOME Date: Sun Sep 16 20:20:48 2018 InstallationDate: Installed on 2018-09-13 (2 days ago) InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Alpha amd64 (20180912) Lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 003: ID 0489:e0a2 Foxconn / Hon Hai Bus 001 Device 004: ID 27c6:5395 Bus 001 Device 002: ID 0bda:58f4 Realtek Semiconductor Corp. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: Dell Inc. XPS 15 9575 ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-7-generic root=UUID=26ff4c95-5f68-4121-b7d0-989fa705fcc8 ro quiet splash pcie_aspm=force drm.vblankoffdelay=1 i915.fastboot=1 vt.handoff=1 RelatedPackageVersions: linux-restricted-modules-4.18.0-7-generic N/A linux-backports-modules-4.18.0-7-generic N/A linux-firmware 1.175 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 08/08/2018 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.1.9 dmi.board.name: 0C32VW dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 10 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr1.1.9:bd08/08/2018:svnDellInc.:pnXPS159575:pvr:rvnDellInc.:rn0C32VW:rvrA00:cvnDellInc.:ct10:cvr: dmi.product.family: XPS dmi.product.name: XPS 15 9575 dmi.product.sku: 080D dmi.sys.vendor: Dell Inc. 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