Re: Synaptics RMI4 touchpad regression in 4.11-rc1
From: Andrew Duggan
Date: Tue Mar 28 2017 - 21:50:58 EST
On 03/19/2017 10:00 PM, Peter Hutterer wrote:
On Fri, Mar 17, 2017 at 12:23:36PM -0700, Andrew Duggan wrote:
On 03/17/2017 09:57 AM, Benjamin Tissoires wrote:
On Wed, Mar 15, 2017 at 2:19 AM, Andrew Duggan <aduggan@xxxxxxxxxxxxx> wrote:
On 03/13/2017 10:10 PM, Cameron Gutman wrote:
On 03/13/2017 06:35 PM, Andrew Duggan wrote:
On 03/13/2017 06:15 AM, Benjamin Tissoires wrote:
[Resending, forgot to add Jiri in CC]
On Mar 13 2017 or thereabouts, Benjamin Tissoires wrote:
On Mar 13 2017 or thereabouts, Thorsten Leemhuis wrote:
Lo! On 12.03.2017 02:55, Cameron Gutman wrote:
Beginning in 4.11-rc1, it looks like RMI4 is binding to my XPS 13
9343's
Synaptics touchpad and dropping some errors into dmesg. Here are the
messages that seem RMI-related:
rmi4_f34 rmi4-00.fn34: rmi_f34v7_probe: Unrecognized bootloader
version
rmi4_f34: probe of rmi4-00.fn34 failed with error -22
rmi4_f01 rmi4-00.fn01: found RMI device, manufacturer: Synaptics,
product: TM3038-001, fw id: 1832324
input: Synaptics TM3038-001 as
/devices/pci0000:00/INT3433:00/i2c-7/i2c-DLL0665:01/0018:06CB:76AD.0001/input/input19
hid-rmi 0018:06CB:76AD.0001: input,hidraw0: I2C HID v1.00 Mouse
[DLL0665:01 06CB:76AD] on i2c-DLL0665:01
FWIW, I get this on my XPS 13 DE (9360) with 4.11-rc1:
input: SynPS/2 Synaptics TouchPad as
/devices/platform/i8042/serio1/input/input6
rmi4_f34 rmi4-00.fn34: rmi_f34v7_probe: Unrecognized bootloader
version
rmi4_f34: probe of rmi4-00.fn34 failed with error -22
rmi4_f01 rmi4-00.fn01: found RMI device, manufacturer: Synaptics,
product: TM3038-003, fw id: 2375007
input: Synaptics TM3038-003 as
/devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-8/i2c-DLL075B:01/0018:06CB:76AF.0001/input/input20
hid-rmi 0018:06CB:76AF.0001: input,hidraw0: I2C HID v1.00 Mouse
[DLL075B:01 06CB:76AF] on i2c-DLL075B:01
[â]
Compared to hid-multitouch, the RMI stack seems to have completely
broken
palm rejection and introduced some random jumpiness during fine
pointing
motions. I don't know if these issues are caused by the above errors
or
are a separate issue.
The error about the bootloader version not being recognized just means
that updating the firmware is not supported on this touchpad. It is only the
F34 firmware update functionality which is failing to load. The palm
rejection and jumps are not related to this error.
Maybe that code path should be changed to not make as much noise when it
runs
on known unsupported hardware. Something like the attached patch?
Looking at how hid-multitouch handles palms it looks like palms should
not be reported as active when calling input_mt_report_slot_state(). I'm
setting the tool type to MT_TOOL_PALM when the firmware determines that a
contact is a palm. But, that does not seem to be sufficient enough to have
the palms filtered out. After some quick testing it looks like the change
below will restore palm rejection similar to that provided by
hid-multitouch.
It looks like your email client ate the tabs, but if I apply the change
myself it seems to fix the palm rejection regression for me.
Tested-by: Cameron Gutman <aicommander@xxxxxxxxx>
Sorry, I was short on time and just copied the diff into the email. I'll
submit a proper patch soon with your tested-by included. Thanks for testing.
I just pointed out this patch (well the actual submission) to Jason
(Cc-ed). Given that there is no proper handling of MT_TOOL_PALM yet in
userspace, I thought it was the easiest way.
However, it seems that this doesn't enhance the jumps and just make it worse.
I was assuming that the jumps and palm rejection where two separate issues.
But, the palm rejection patch makes things worse?
Is there anything we can do to fix it (besides temporary disabling the
automatic loading of hid-rmi)?
I do not have a fix for the jumps yet. My next step is to file a bug against
libinput or the kernel. I used evemu-record to capture a log with jumps, but
when I play it back with a different userspace input stack with an older
version of libinput I do not see the jumps. I see the jumps on Fedora 25
with libinput 1.6.3 vs Ubuntu 16.10 with libinput 1.4.3 with X). Or at least
the jumps are not as significant. But, its possible there is an issue with
how the events are being reported which is incorrect and confusing libinput.
The X and Y coordinates being reported by the firmware seem correct and I
haven't found a problem yet. I thought a bug would be a better place to
collect evemu-record logs and compare.
fwiw, there's a fairly easy way to quickly check libinput for changes and
that's by having the gtk3-headers installed at configure time and then
running sudo ./tools/event-gui to visualize the movement (Esc quits)
That tool uses libinput data directly to draw pointer motion etc, so it's a
way to quickly bisect to where changes happen. Without anything else to go
on, I'd say it's the new touchpad acceleration code from libinput 1.5 - the
max accel factor has changed so depending on the speed of the jumps, you can
now get stronger pointer movement.
Cheers,
Peter
I have been looking into this on and off and I found a couple things,
but nothing conclusive yet. I think Peter is right that versions of
libinput 1.5 and later do make the jump more pronounced. But, the new
acceleration code my simply be amplifying the jumps. I went ahead and
filed a libinput bug since the jumps are more significant in newer
versions of libinput and I attached some evemu-record logs.
https://bugs.freedesktop.org/show_bug.cgi?id=100436
I also spent time looking into the kernel drivers to see if they were
causing or contributing to the jumps. One of the things that I tried was
calling rmi_irq_fn() from a workqueue instead of calling
generic_handle_irq(). Originally, we were using a workqueue before
interrupt handling was added to the rmi core. I also tried moving the
call to generic_handle_irq() to a workqueue. In both cases the jumps
seemed to disappear or at least be reduced. I looked through the irq
handling code and I did not see anything which should cause an issue.
The only difference between irq thread and the workqueue that I could
think of is that the irq thread runs at a higher priority. But, I didn't
really see much of a difference between the timing of the events in the
evemu-record logs.
At this point I am still not sure if the issue is that the events are
being reported incorrectly by the kernel or if the new touchpad
acceleration code in libinput is just not handling the events correctly.
I would appreciate any suggestions. I'm not sure how much time we have
left before we need to decide if we need to go back to hid-multitouch or
not.
Thanks,
Andrew
Hopefully, this will end up being a quick fix in the kernel and we can get
it applied to 4.11 without having to hold off on disabling hid-rmi for PTPs.
Andrew
Cheers,
Benjamin
Just to confirm: I noticed "jumpiness during fine pointing motions" as
well since switching to 4.11-rc.
One of my test systems is a XPS 13 9343 and I have not really seen any
jumpiness. But, based on the data I am seeing that if I lift my finger and
place it again in a short period of time the first event or so will be at
the location of the previous contact. Then it will switch over to the
current location. When switching over to hid-multitouch I was unable to
reproduce this behavior. This definitely could be the source of the jumps.
The jumpiness definitely happens without lifting my finger, but I'm
willing
to test any patch you think would improve the situation. Moving one finger
slowly in a figure-8 across my touchpad shows the issue clearly for me.
The
small variations in speed of my finger due to the friction on the trackpad
get magnified to relatively large jumpy pointer movements on screen. It
seems much more noticeable in diagonal movements than completely vertical
or horizontal movements.
Regards,
Cameron
---
diff --git a/drivers/input/rmi4/rmi_f34v7.c
b/drivers/input/rmi4/rmi_f34v7.c
index 56c6c39..1291d9a 100644
--- a/drivers/input/rmi4/rmi_f34v7.c
+++ b/drivers/input/rmi4/rmi_f34v7.c
@@ -1369,9 +1369,9 @@ int rmi_f34v7_probe(struct f34_data *f34)
} else if (f34->bootloader_id[1] == 7) {
f34->bl_version = 7;
} else {
- dev_err(&f34->fn->dev, "%s: Unrecognized bootloader
version\n",
- __func__);
- return -EINVAL;
+ dev_info(&f34->fn->dev, "%s: Unsupported bootloader
version: %u\n",
+ __func__, f34->bootloader_id[1]);
+ return -ENODEV;
}
memset(&f34->v7.blkcount, 0x00, sizeof(f34->v7.blkcount));