Ubuntu 8.10 wacom 绘图板驱动问题

我的绘图板在Linux认成Waltop的板子，一直以来用wacom的驱动跑得好好的。

但是前一阵子更新系统以后就出了问题，现象是移动没问题，但是一点击就没有反应了，得把笔尖离开板子几秒再靠近才行。或者如果一开始迅速把笔尖点在板子上移动也能响应，但是抬起就不行了。

中间折腾了很长时间，一开始以为电池没电了，后来发现Windows下好好的。后来开始到处搜，xorg.conf自然是改了无数次，另外还改了udev, hal。到最后这几个东西弄得差不多都明白了，绘图板还是不干活。

后来，终于在Ubuntu官方帮助里看到了如下文字：

Users might also be affected by a bug in the 8.1.4 version of the wacom drivers that comes with Ubuntu 8.10, where the input freeze when the pen touches the tablet. If that is the case for you, you can install updated drivers :

于是“一声叹息”。。。

后来想编译份最新的linuxwacom，但是又有别的问题，总报usbParse: Exceeded channel count; ignoring the events.搜了一下，似乎也是很新的问题，开发者还在解决中。

于是下了那个帮助里给的两个deb并安装，似乎第一次没有成功，也可能是没有重启的缘故。但是第二次就好了。

总算是好了。

Comments

Determine Perspective Lines With Off-page Vanishing Point

In perspective drawing, a vanishing point represents a group of parallel lines, in other words, a direction. For any point on the paper, if we want a line towards the same direction (in the 3d space), we simply draw a line through it and the vanishing point. But sometimes the vanishing point is too far away, such that it is outside the paper/canvas. In this example, we have a point P and two perspective lines L1 and L2. The vanishing point VP is naturally the intersection of L1 and L2. The task is to draw a line through P and VP, without having VP on the paper. I am aware of a few traditional solutions: 1. Use extra pieces of paper such that we can extend L1 and L2 until we see VP. 2. Draw everything in a smaller scale, such that we can see both P and VP on the paper. Draw the line and scale everything back. 3. Draw a perspective grid using the Brewer Method. #1 and #2 might be quite practical. #3 may not guarantee a solution, unless we can measure distances/p...

[转] UTF-8 and Unicode FAQ for Unix/Linux

这几天,这个东西把我搞得很头疼而且这篇文章好像太大了,blogger自己的发布系统不能发只好用mail了 //原文 http://www.cl.cam.ac.uk/~mgk25/unicode.html UTF-8 and Unicode FAQ for Unix/Linux by Markus Kuhn This text is a very comprehensive one-stop information resource on how you can use Unicode/UTF-8 on POSIX systems (Linux, Unix). You will find here both introductory information for every user, as well as detailed references for the experienced developer. Unicode has started to replace ASCII, ISO 8859 and EUC at all levels. It enables users to handle not only practically any script and language used on this planet, it also supports a comprehensive set of mathematical and technical symbols to simplify scientific information exchange. With the UTF-8 encoding, Unicode can be used in a convenient and backwards compatible way in environments that were designed entirely around ASCII, like Unix. UTF-8 is the way in which Unicode is used under Unix, Linux, and similar systems. It is now time to make sure that you are well familiar ...

Moving Items Along Bezier Curves with CSS Animation (Part 2: Time Warp)

This is a follow-up of my earlier article. I realized that there is another way of achieving the same effect. This article has lots of nice examples and explanations, the basic idea is to make very simple @keyframe rules, usually just a linear movement, then use timing function to distort the time, such that the motion path becomes the desired curve. I'd like to call it the "time warp" hack. Demo See the Pen Interactive cubic Bezier curve + CSS animation by Lu Wang ( @coolwanglu ) on CodePen . How does it work? Recall that a cubic Bezier curve is defined by this formula : \[B(t) = (1-t)^3P_0+3(1-t)^2tP_1+3(1-t)t^2P_2+t^3P_3,\ 0 \le t \le 1.\] In the 2D case, \(B(t)\) has two coordinates, \(x(t)\) and \(y(t)\). Define \(x_i\) to the be x coordinate of \(P_i\), then we have: \[x(t) = (1-t)^3x_0+3(1-t)^2tx_1+3(1-t)t^2x_2+t^3x_3,\ 0 \le t \le 1.\] So, for our animated element, we want to make sure that the x coordiante (i.e. the "left" CSS property) is \(...

WangLu's Notes

Search This Blog