[mythtv-users] Screen corruption with fglrx X driver

David Gee david at allpowerfuldave.com
Sun Aug 3 15:33:10 UTC 2008

I've done a little more investigating and tried tweaking some settings, and
here are the various problems I've identified; I would appreciate any input
anyone can give me.

1. Mythfrontend menus: if I run mythfrontend using the --geometry parameter,
the menus always display correctly. If I omit the --geometry parameter so
that mythfrontend runs full-screen, then the output on the screen gets
corrupted (although a screenshot shows the menu drawn correctly). I have
found that if I change the paint method from Qt to OpenGL, the actual menus
themselves then display correctly, although the initial loading screen with
the progress bar still appears corrupted.

2. Settings screens: If I have the OpenGL paint method enabled (to fix the
screen corruption as described above), none of the settings screens work -
the screen doesn't change and doesn't respond to key presses, although
pressing Escape enough times usually regains control of the menus. However,
this is only happens in full-screen mode: running mythfrontend with a
--geometry parameter gets around this problem. If I am using the Qt paint
method, this menu works all the time (however it's useless in full-screen
mode because of the aforementioned screen corruption in full-screen mode
without OpenGL).

3. Watching TV: generally works; however, mythfrontend frequently segfaults
while watching TV. Changing channels is also problematic: most of the time,
this causes the TV output for the newly changed channel to be garbled.
However, pressing escape to get back to the main menu and then going back to
watching TV results in that channel being displayed perfectly. See
http://www.allpowerfuldave.com/mythtv2.png and
http://www.allpowerfuldave.com/mythtv3.png for examples of the garbled
output after changing channels. The output appears to differ depending on
whether the broadcast is SD or HD.

Any insight or suggestions would be greatly appreciated.


My setup:

Mythtv 0.21
Fedora 9, fully patched
Stock Fedora 9 Kernel,
ATI Radeon HD 2600 PRO graphics card
fglrx graphics drivers 8.512-1.8.07 (from livna repository)
1080i/p TV connected via HDMI (DVI output using DVI-HDMI adapter) running at
1920x1080 screen res

Xorg conf:

Section "Device"
    Identifier  "Videocard0"
    Driver      "fglrx"
    Option        "OpenGLOverlay" "off"
    Option        "VideoOverlay" "on"
    Option        "TexturedVideo" "on"
    Option        "TexturedVideoSync" "on"
    Option        "Capabilities" "0x00000800"
    BusID       "PCI:1:0:0"

On Wed, Jul 30, 2008 at 2:13 PM, Jason McMillon <jmcmillon at gmail.com> wrote:

> On Tue, Jul 29, 2008 at 8:34 PM, David Gee <david at allpowerfuldave.com>
> wrote:
> > Thanks to all for the various suggestions; using the --geometry argument
> > fixes the problem with the screen garbling - I'll havea a fiddle with
> some
> > of the xorg.conf settings and see if I can fix it for fullscreen too
> using
> > the ideas that have been put forward.
> >
> > When viewing widescreen HD content, I also saw the duplicate videos
> stacked
> > on top of each other. How do you change which deinterlacer is being used?
> >
> > Regards
> > David
> >
> > On Mon, Jul 28, 2008 at 4:39 PM, Eric (MythTV) <eric-mythtv at skoozdag.com
> >
> > wrote:
> >>
> >> Jason McMillon wrote:
> >> > I am having the same problems as described above.  I am using a
> >> > GIGABYTE GA-MA78GPM-DS2H motherboard which has an onboard ATI HD3200.
> >> >
> >> > I have seen other posts that indicate VideoOverlay should be on and
> >> > OpenGLOverlay should be off.  Regardless, neither combination works
> >> > for my frontend.
> >> >
> >> > However, I can get passed the garbled picture David posted above by
> >> > doing what Eric suggested... setting the geometry for mythfrontend at
> >> > the command line, eg:
> >> >
> >> >  mythfrontend --geometry 800x600
> >> >
> >> > Unfortunately, when I try to watch a recording this way, I get two
> >> > duplicate videos... one right on top of the other.  Very strange....
> >> >
> >> > I am running it on a CentOS 64-bit system with everything up to
> date...
> >>
> >>
> >> Jason:
> >>
> >> I also had the issue with the duplicate videos.  The duplicate videos
> >> one ontop of the other is an issue with the deinterlacer I was using at
> >> the time.  Are you using Bob(2x)?  I got the same picture issue as you
> >> described, two copies of the video, with Bob.  When I changed to a
> >> different deinterlacer, it went away.  Play with your deinterlacers and
> >> you should be able to get that issue to go away, at least.  I think I
> >> ended up using Kernel, perhaps?  I cant remember... but I was able to
> >> fix that issue, for sure.
> >>
> >> Heres something else to try, for the screen garble running in full
> >> screen mode.  I think it had something to do with when mythfrontend was
> >> trying to use DRI.  Try turning DRI off in the xorg.conf file (not sure
> >> the command, sorry, I just removed permissions to /dev/dri/video0 so
> >> that mythfrontend couldnt access it), and the screen garble seemed to go
> >> away.  I'm afraid not using DRI is why I was having screen tearing
> >> issues -- not positive of that however -- but at least not using it
> >> didnt garble the screen.
> >>
> >> I'm pretty sure thats how I fixed it on my system, had to look back over
> >> the notes I was taking at the time of all the different things I was
> >> trying. :)
> >>
> >> If you get the screen garble to go away, please report if you have any
> >> issues with video tearing, with the HD 3200.  I'm curious to hear.
> >>
> >> BTW, I have the same motherboard as you.  Well, almost.  Mines the DS3H.
> >>
> >> Good luck...
> >> --Eric
> >>
> >> _______________________________________________
> >> mythtv-users mailing list
> >> mythtv-users at mythtv.org
> >> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
> >
> >
> Deinterlacing is now included with playback profiles found under
> Setup> TV > Playback > Profiles or something like that.  I haven't had
> a chance to play with it much.  I read in different post that the
> "slim" profile does not have deinterlacing enabled.  I haven't had
> much time to play with it... damn thesis...
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