official 7-inch touchscreen polling rate too low
**Describe the bug** The rate of input events arriving at userspace when using the Official 7inch touchscreen is too low. Input events arrive at user space at about 33Hz, resulting in perceived lagginess of touch applications, even though the application is running at 60fps. This bug was present once before, see #3227, so this is kinda a regression. I'm not sure exactly what commit/update caused it to go back down to 33Hz though. **To reproduce** See #3227 **Expected behaviour** Expected is at least 60Hz, possibly even higher (since touchscreen controller seems to support 100Hz, and higher polling rates result in less input lag. All iPhones past iPhone X for example poll at 120Hz, some android gaming phones at 240Hz) **Actual behaviour** The frequency of input events arriving at userspace is 33Hz. **System** ``` System Information ------------------ Raspberry Pi 4 Model B Rev 1.1 PRETTY_NAME="Raspbian GNU/Linux 10 (buster)" NAME="Raspbian GNU/Linux" VERSION_ID="10" VERSION="10 (buster)" Raspberry Pi reference 2019-09-26 Generated using pi-gen, https://github.com/RPi-Distro/pi-gen, 80d486687ea77d31fc3fc13cf3a2f8b464e129be, stage2 Linux hpi4 5.4.51-v7l+ #1327 SMP Thu Jul 23 11:04:39 BST 2020 armv7l GNU/Linux Revision : b03111 Serial : 100000001afe70ee Model : Raspberry Pi 4 Model B Rev 1.1 Throttled flag : throttled=0x0 Camera : supported=0 detected=0 Videocore information --------------------- Jul 17 2020 10:59:17 Copyright (c) 20
Posted by ardera on Aug 6, 2020, 10:00 PM
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official 7-inch touchscreen polling rate too low
**Describe the bug** The rate of input events arriving at userspace when using the Official 7inch touchscreen is too low. Input events arrive at user space at about 33Hz, resulting in perceived lagginess of touch applications, even though the application is running at 60fps. This bug was present once before, see #3227, so this is kinda a regression. I'm not sure exactly what commit/update caused it to go back down to 33Hz though. **To reproduce** See #3227 **Expected behaviour** Expected is at least 60Hz, possibly even higher (since touchscreen controller seems to support 100Hz, and higher polling rates result in less input lag. All iPhones past iPhone X for example poll at 120Hz, some android gaming phones at 240Hz) **Actual behaviour** The frequency of input events arriving at userspace is 33Hz. **System** ``` System Information ------------------ Raspberry Pi 4 Model B Rev 1.1 PRETTY_NAME="Raspbian GNU/Linux 10 (buster)" NAME="Raspbian GNU/Linux" VERSION_ID="10" VERSION="10 (buster)" Raspberry Pi reference 2019-09-26 Generated using pi-gen, https://github.com/RPi-Distro/pi-gen, 80d486687ea77d31fc3fc13cf3a2f8b464e129be, stage2 Linux hpi4 5.4.51-v7l+ #1327 SMP Thu Jul 23 11:04:39 BST 2020 armv7l GNU/Linux Revision : b03111 Serial : 100000001afe70ee Model : Raspberry Pi 4 Model B Rev 1.1 Throttled flag : throttled=0x0 Camera : supported=0 detected=0 Videocore information --------------------- Jul 17 2020 10:59:17 Copyright (c) 20
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