Re: [gentoo-user] Weird graphical glitches after world update

[Alan McKinnon]

On 21/11/2013 17:10, Mateusz Kowalczyk wrote:
> Greetings,
>
> I spent a chunk of yesterday updating world on my machines (2 file
> servers and 1 netbook) and with some effort, the updates went through. I
> had to go out today so I rebooted my netbook and I started noticing
> weird graphical glitches in certain applications, as if parts of the
> screen weren't updating, namely in urxvt and emacs. In urxvt, my shell
> prompt seems to not render the cursor and often keeps the letters I
> remove still on the prompt (only graphically, they aren't actually
> there). This is extremely annoying.
>
> It's also terrible in emacs: cursor sometimes doesn't get rendered and I
> get tons of artefacts from different buffers when I switch or from text
> I was editing. You can find an example image of such glitches in emacs
> at [1]. This is absolutely tragic for me as I spend majority of my time
> in emacs. I'd like to note that I'm running emacs in a graphical frame
> and not in a terminal.


A quick note to say that you are not alone, I get this as well since
about 6 weeks ago (a ~amd system). So it's not something you and just
you managed to do, I got it as well.

In my case it's as if the system's idea of what is on the screen is off
by one row of pixels. I get a stray row of dots at the top of lines that
correspond to the risers of glyphs on the previous line, and new
underscores don't show up until I enter a newline.

This is a mostly KDE system using konsole, so it's not the terminal
emulator or editor that's the root cause.




>
> I'm unsure whether this is the case in my other machines as they are
> headless and don't even have X.
>
> The issue is weird however: firefox and thunderbird are fine, they don't
> suffer any such glitches. I can also make the glitches go away by
> ‘refreshing’ my screen with use of xrandr, such as telling xrandr to
> change my settings to what they currently are, which should technically
> be a no-op but well, it seems that it does it anyway.
>
> Oh, I should mention that I did not update my kernel
> Linux misaki 3.9.0-rc6 #1 SMP Tue Apr 9 10:51:07 BST 2013 i686 Intel(R)
> Core(TM)2 Duo CPU L7700 @ 1.80GHz GenuineIntel GNU/Linux
>
> I am truly lost as to how to troubleshoot this. I provide links to some
> of my system information below:
>
> http://fuuzetsu.co.uk/misc/genlop
> http://fuuzetsu.co.uk/misc/emergeinfo
>
> Please feel free to request any information. I hope someone can aid me
> as this basically renders my shell and emacs useless and they are the
> two things I absolutely need. Even getting my logs was difficult with
> such broken setup.
>
> Thanks.
>
> [1]: http://fuuzetsu.co.uk/images/badrendering.png
>


-- 
Alan McKinnon
alan.mckinnon@×××××.com