On Sat, May 3, 2008 at 6:25 PM, Denver Gingerich <[EMAIL PROTECTED]> wrote: > On Fri, May 2, 2008 at 10:42 PM, Denver Gingerich <[EMAIL PROTECTED]> wrote: >> >> On Thu, May 1, 2008 at 11:38 PM, Denver Gingerich <[EMAIL PROTECTED]> wrote: >> > On 2.6.22-20080123.4 and newer master kernels (specifically >> > 2.6.22-20080123.4, 2.6.25-20080430.1, 2.6.25-20080501.2, and >> > 2.6.25-20080501.3), the cursor cannot move from side to side with the >> > touchpad, only up and down. Using a USB mouse works fine. >> > >> > Here is an example X session: >> > 1. start X, cursor is in the center of the screen; touchpad has not been >> touched >> > 2. touch touchpad, cursor immediately jumps to the left side of the >> screen > > See below for more details on Step 2. > >> > 3. move around on touchpad, cursor stays "stuck" to the left side of >> > the screen, but moves up and down relative to how much vertical >> > touchpad movement there is >> > 4a. release finger from touchpad, cursor immediately jumps to the >> > top-left corner of the screen (this may not be exactly the top-left >> > corner, but it is always on the left-most column of pixels within the >> > top 50-100 rows of pixels) >> > 4b. move finger across right edge of touchpad, cursor moves very >> > quickly from left to right across the screen (there appears to be a >> > small area between the touchpad and the right third of the drawing pad >> > where left to right motion is detected) >> > >> > Performing steps 2-4 consistently gives the same results within the >> > same X session and across reboots. > [...] >> >> The problem is present in 2.6.22-2008115.1 but not in >> 2.6.22-20080113.1. > > The problem is also present in 2.6.22-20080114.2. So the problem is > between the following commits: > > f8709785a433a5a3344304f9796fb26a65d69a1e > cb6634de39d36cb9cc719c2940e456929ccceea2 [...] > Here are some additional details for Step 2 (touch touchpad): the > vertical position that the cursor jumps to is correlated with the > location on the touchpad that my finger is on. For example, if I > touch the top part of the touchpad, the cursor will jump to the top > part of the screen. So there is some absolute positioning going on. > > Additionally, a button press is registered when I touch the touchpad > (even when I don't click the button) and a button release is > registered when I take my finger off the touchpad. So moving my > finger on the touchpad is essentially dragging whatever happens to be > under the cursor. The button press is registered after the cursor > jumps to its new position on the screen following my finger touching > the touchpad.
This issue is present in the 2.6.26-rc3 master kernel (not surprising as mouse/olpc.c hasn't changed since 2.6.25). I now have access to a development environment so I should be able to compile the intermediate commits (between f870978 and cb6634d) to diagnose the problem further. I will report back when I have more results. Denver _______________________________________________ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
