On Wed, May 11, 2011 at 10:36:33AM +0200, Jonas wrote:

> From: Jonas <co...@online.de>
> To: xournal-devel <xournal-devel@lists.sourceforge.net>
> Date: Wed, 11 May 2011 10:36:33 +0200
> Subject: Re: [Xournal-devel] Delayed drawing flavour Alice and flavour Bob
> 
> Okay, to sort this mess out: I am pretty sure there are actually two
> different bugs, or at least two different manifestations of the same
> bug:
> 
> *** Bug A
> - Reported by GI on May 7th
> 
>   "When my display is rotated, I find that the drawing of regular
>   strokes is delayed. That is, if I move the pen to the right by one
>   inch, it takes a second for me to see the stroke appear"
> 
>   I'll add to that: If I draw a continuous line, I see every second or
>   split second a small part of the line appearing.
> 
> - Happens only when display is rotated
> - --sync independent
> 
> - Enabled INPUT_DEBUG on "visible" terminal make it disappear for some
>   (Jonas May 10th)
>   Not for all though, apparently (GI May 10th)
> 
> - Is not experienced with xf86-video-intel<=2.14.0 or current
>   upstream git (Jonas May 10th)

I just upgraded to the current upstream git (2011-05-12) and I don't see
the problem either!

> 
> *** Bug B
> - Reported by dmg on May 7th
>   "This might or might not be related ... in some cases the
>   strokes are not displayed when created (but they are saved)
>   Only when the page is refreshed."
> 
>   I'll add to that: if I draw a continuous long line, the drawing
>   stops at some random point and from there on only small stripes or
>   blocks show the new lines. All is shown as soon as some drawing
>   update is forced, as by hovering over the scrollbar or scrolling
>   with cursor keys. (my description)
> 
>   "they look like bands across the entire page --rectangles to be more
>   precise, where nothing is redrawn" (dmg 10th)
> 
> - Affects rotated as well as non-rotated (dmg 9th)
> - --sync independent
> - Doesn't affect X201T, but X61T (dmg 10th)
> - Enabled INPUT_DEBUG on visible terminal make it disappear (dmg 10th)
>   I can confirm this now here as well
> 
> - Perhaps connected to kernel changes between 2.6.32 and 2.6.38
>   ("I rebooted, and upgraded to kernel 2.6.38-2.  Now I have a whole
>   bunch of weird drawing problems even in unrotated mode" GI and
>   another mail "but not on the 2.6.32 kernel" GI)
> 
> - on upstream xf86-video-intel and kernel 2.6.38, this bug still
>   occurs, but ironically only in non-rotated mode (Jonas now)

On git HEAD xf86-video-intel (as of 2011-05-12), and 2.6.38 kernel, I
erratically have this problem!

I'm pretty sure this can't be an Xournal problem It's either an X server
problem, or (more likely) a display driver problem. I'm going to follow
this on Debian bugzilla for a bit and see what turns up.

GI

-- 
100 THINGS I'D DO IF I EVER BECAME AN EVIL OVERLORD
40. I will be neither chivalrous nor sporting. If I have an unstoppable
superweapon, I will use it as early and as often as possible instead of
keeping it in reserve.

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