On Sat, 09 Mar 2024 17:55:32 +0000 bugzilla-daemon@xxxxxxxxxx wrote: > https://bugzilla.kernel.org/show_bug.cgi?id=218578 > > Bug ID: 218578 > Summary: MXC6655 accelerometer not working with MXC4005 driver > Product: Drivers > Version: 2.5 > Hardware: Intel > OS: Linux > Status: NEW > Severity: normal > Priority: P3 > Component: IIO > Assignee: drivers_iio@xxxxxxxxxxxxxxxxxxxxxx > Reporter: kernelbugzilla@xxxxxxxxxxxxxxxx > Regression: No > > Created attachment 305970 > --> https://bugzilla.kernel.org/attachment.cgi?id=305970&action=edit > Output from udevadm info -n /dev/iio\:device0 && also some samples of > accelerometer raw values I see in /sys/bus/iio/devices/iio:device:0/. > > Hello, > > I recently bought two Chuwi tablets which contain MXC6655 accelerometers. The > accelerometers work in Windows 11 and the tablet rotates as expected in > Windows, but upon installing Linux the tablet auto rotation was not working. > Hi, thanks for the report, First thought is that there may be some power control hidden in the ACPI tables. Could you dump /sys/firmware/acpi/tables/DSDT and run it through iasl -d (from acpica-tools) Find the section related to his accelerometer and post all of that. Sometimes there is a _DSM (device specific method) used to power things up - this stuff is completely non standard unfortunately so we have to base any support on table dumps from the particular devices. Thanks, Jonathan > The Chuwi tablets are: > - UBook X Pro 2023 > - UBook X 2023 > > This does not appear to be distro specific, as I am seeing the same behavior on > both: > - Linux Mint 21.3, with kernel 5.15.0-91-generic > - Fedora 39 Workstation, with kernel 6.5.6-300.fc39.x86_64 > > I came across this thread indicating that support was added for this in 2020 > via the MXC4005 driver: https://www.spinics.net/lists/linux-iio/msg53171.html > > This seems to be double confirmed by another issue I found here on this bug > tracker: https://bugzilla.kernel.org/show_bug.cgi?id=206703 > > Unfortunately in my case, I see the MXC4005 driver is in fact loaded and > running, however it appears the raw data is not changing. When looking at the > output from iio-sensor-proxy with "monitor-sensor", the orientation always > reports "left-up". > > I tried a test where I watched a cat of all of the files in > /sys/bus/iio/devices/iio:device0/, and I never see the raw data changing when > the tablet is rotated. I'm attaching the values I see from the raw data in the > text file. Interestingly, Fedora reports different raw values, but > iio-sensor-proxy still says orientation is left-up with these values. In both > cases, the values don't change when the tablet is rotated. > > The output of "udevadm info -n /dev/iio\:device0" is attached too. > > lsmod reports that the mxc4005 driver is loaded, along with industrialio and > industrialio_triggered_buffer. Unloading the mxc4005 module with rmmod causes > it to disappear from iio-sensor-proxy as expected, but otherwise unloading and > reloading the driver seems to have no effect on the symptoms. > > If there is any further information I can gather which will be helpful, or any > testing I can help with, please let me know. > > Thanks! >
