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mrshpot

Member

Registered: 2010-08-29

Posts: 9

[SOLVED: fixed in upstream] TTF font garbling in Emacs

After today's upgrade I started getting redraw artifacts in Emacs.
Having poked around, I discovered that the artifacts happen with TTF fonts only.
Here are some examples taken with emacs -Q (i.e. without user's config) and with hl-line-mode (highlight current line) which makes the problem more obvious:
Fixed (bitmap font), no problem:
http://imgur.com/1dz6f
Andale Mono (TTF), ugh:
http://imgur.com/nztIK

EDIT: The artifacts occur on pretty much any text change, and a full redraw makes it go away (until the next action)
My machine is a laptop with integrated Intel video.

xf86-video-intel 2.14.0-1
xorg-server 1.9.3.901-1

Window manager: Xfwm with compositing

Does this seem like an upstream bug, or is it a packaging problem?

Last edited by mrshpot (2011-02-04 10:11:37)

ewaller

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 20,196

Re: [SOLVED: fixed in upstream] TTF font garbling in Emacs

I think I am seeing this bug as well.   I am not at my machine, and did not try changing fonts.  I did establish that the problem goes away if you turn of Compositing (on my machine).  If you try without compositing, I'll try different fonts when I get home tonight.

A brief search indicates it may be an an upstream problem with the Intel drivers -- Several bug reports have appeared and date back to about mid-January.  I was also going to try rolling back the driver / dri stuff to the previous version.  I generally use Xfce4 with Compiz.  Kwin with effects turned on caused the same issue.  Also, KDE seems to through fits (Application crashes / disabling effects / turning off specific effects) with this driver.

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Sometimes it is the people no one can imagine anything of who do the things no one can imagine. -- Alan Turing
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mrshpot

Member

Registered: 2010-08-29

Posts: 9

Re: [SOLVED: fixed in upstream] TTF font garbling in Emacs

Disabling compositing "fixes" the problem for me as well.
Could you point me at some bug reports? I have only managed to find stuff related to 2.12.

ewaller

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 20,196

Re: [SOLVED: fixed in upstream] TTF font garbling in Emacs

https://bugs.freedesktop.org/show_bug.cgi?id=32734  Is the one that comes to mind.  I have more references at home.  I'll post them tonight [GMT-8]

---

Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
Sometimes it is the people no one can imagine anything of who do the things no one can imagine. -- Alan Turing
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How to Ask Questions the Smart Way

mrshpot

Member

Registered: 2010-08-29

Posts: 9

Re: [SOLVED: fixed in upstream] TTF font garbling in Emacs

Thanks.
In the mean time, threre's also https://bugs.freedesktop.org/show_bug.cgi?id=33253, which has been marked as a duplicate of that bug.

ewaller

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 20,196

Re: [SOLVED: fixed in upstream] TTF font garbling in Emacs

Sorry it is so late... Helping my daughter with her calculus. 

I did verify that changing to a bit mapped font "fixed" the emacs problem.  I was experiencing system wide instability with emacs, Xfce4 / Compiz, KDE / kwin so I backed down just the Intel driver, leaving the updates to Xorg and Dri.  Emacs and Compiz returned to health, but KDE was confused to the extent I had to start with a clean profile. 

Unfortunately, I need a stable system for a few days, so I will not be able to experiment with the driver for now.

I checked my notes, and our previous bug reports pretty much cover it.  There was one other Gentoo bug that was the Genesis of the one that i had posted.

---

Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
Sometimes it is the people no one can imagine anything of who do the things no one can imagine. -- Alan Turing
---
How to Ask Questions the Smart Way

mrshpot

Member

Registered: 2010-08-29

Posts: 9

Re: [SOLVED: fixed in upstream] TTF font garbling in Emacs

The bug has been addressed.
The freedesktop bugzilla now mentions a commit in xf86-video-intel git.
I extracted it into a patch and it worked for me.
Just in case, the PKGBUILD and the patch I used:
PKGBUILD:   http://aur.pastebin.com/SqB9j8RC
uxa-damage.patch:   http://pastebin.com/MHvkTRuu

EDIT:
the uxa-damage.patch checksum won't match as pastebin has swallowed trailing new-lines.
for the checksum to match, two newlines should be added, like this:

1.7.4<ret>
<ret>

Last edited by mrshpot (2011-02-03 19:43:33)

simon-nicholls

Member

Registered: 2011-02-04

Posts: 2

Re: [SOLVED: fixed in upstream] TTF font garbling in Emacs

That worked great, thanks.

ewaller

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 20,196

Re: [SOLVED: fixed in upstream] TTF font garbling in Emacs

Yep, That did it.  Emacs and KDE effects are both happy with the driver

Thank You

---

Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
Sometimes it is the people no one can imagine anything of who do the things no one can imagine. -- Alan Turing
---
How to Ask Questions the Smart Way

africa

Member

Registered: 2011-02-05

Posts: 1

Re: [SOLVED: fixed in upstream] TTF font garbling in Emacs

Worked well for me too. Thanks!